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Патент USA US2406248

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Aug 20, 1946» ‘
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Y
E. A. PACKARD
'
LIQUID SOLIDS SEPARATION APPARATUS-
>@riginal Filed Feb. 14, 1942
30
42,406,212;
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l
6 Sl‘xeets-Shee‘i’I 1
A° 20, 1946„
E. A. PACKARD
LIQUID SOLIDS SEPARATION APPARATUS
Original Filed Feb. 14, 1942
2,406,248
ì
6 Sheets-»Sheet 2
Aug. 20, l946„
r
E. A. PACKARD
2,406,248 `
LIQUID SOLIDS SEPARATION APPARATUS
Original Filed Feb. 14. 1942
e sheets-snee; s'
INVENTOR
Aug. 20, 1946.
`
5A. PACKARD
'
'LIQUID SOLIDS SEPARATION APPARATUS
Original Filed Feb. 14, 1942
. 2,406,248
6 Shéyets-Sheet 4
9,
1904/6'
172/74
FÍG.5
INVENTOR
Aug. 20, 1946.
E.¿A. PACKARD
LIQUID SOLIDSSEPARATION APPARATUS
Original Filed Feb.~ 14, 1942
IVn.
l.
, www
2,406,248
6 Sheets-Sheet 5
Aug. 2o, 1946. f
- E. A. PACKARD
ì
2,406,248
l
LIQUID soLIDs SEPARATION APPARATUS
Original Filed Feb. 14, 1942
:"_ïï-_îl-_ZL
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6 Sheets-Sheet 6
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1 mmm
wwwwww,
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INVENTOR
Patented Aug. 20, 1946
2,406,248
UNITED STATES PATENT OFFICE
2,406,248
LIQUÍD SOLIDS SEPARATION APPARATUS
Edwin A. Packard, Y0nkers,N. Y.
substituted for abandoned application Serial No.
430,972, February 14, 1942. This appiication
December 3, 1943, Serial No. 512,684
28 Claims. (Cl. 210-55)
1
2
The invention relates to the separating of solid
particles from the liquid of a suspension in which
uid suspension that is overlain and exposed to
gas at substantially sub-atmospheric pressures,
they are carried.
within which tank there is a transfer of a con
'
Many types of suspended matter can be caused
to float on the top of liquid containing the same
when such liquid suspension is transferred from
a locality whereat it was exposed to normal at
mospheric pressure to a closed container where
in it is combinedA with liquid undergoing treat
trolled quantity of froth, scum or other float
material-herein broadly referred to as scum
from the top of the liquid body and a Adelivery of
the transferred scum as a ñoat-fraction to a lo
cality outside of the tank without permitting the
entrance of outside air into the tank, an upward
ment in the container and exposed to overlying 10 transfer of clarified liquid from a lower or in
air or other gas which is continued at pressure
termediate portion of said body to and past a
substantially subatmospheric.
high section or overflow weir which in effect reg
The invention hereof has in view as a broad
aspect thereof a novel process, and a novel ap
ulates the relative quantity of overflow clarified
liquid as compared with the scum transfer here
paratus for performing the process, according to 15 tofore referred to and the subsequent 1delivery of
‘ which there is involved the exposing of a con
overflowed clarified liquid to a locality outside
fined continually fed ever-changing body of such
of the tank without permitting the entrance of
liquid suspension to overlying gas maintained at
outside air into the tank.
pressures substantially sub-atmospheric whereby
According to a more speciñc phase or aspect
the suspended .solids readily rise as a ñoat, scum, 20 of the invention, it extends to such a closed tank
or froth, on the surface of the liquid, the trans
ferring and delivering of a controlled quantity
of scum or froth as an overiiow float-fraction
or vacuum type of unit in which provision is
made for a quiescent sedimentation section with
in the lowermost portion of the tank and for such
leaving the confined body along one path, and
unit there is also provided means for collecting
the upwardly-transferring, overflowing and ulti 25 and transferring sedimented solids as a third
mate releasing of> a controlled quantity of clarified
fraction from the lower interior portion of the
liquid as an outilowing liquid-fraction alonga
tank without permitting the entrance of air into
second path, namely, along a path leading from
the tank and in a manner to effect such trans
a lower or intermediate portion of the confined
fer of the third fraction> without substantially
body.
30 eifecting the general level of the liquid within
rI‘he invention, according to a more specific
aspect thereof, extends into a situation 'wherein
there is provided within or for the lower portion
of said confined body a zone of relative quiescence
favorable to the settling of heavy solids as a sedi
the tank.
The ‘different features and aspects of the in
vention will be manifest and more fully ap
preciated from the following portion of the spec
iñcation and fthe accompanying drawings which
constitute a part of the specification.
ment and to the collecting and progressively
transferring of said sediment as a heavy solid
In the drawings: i
fraction along a third path, namely, along a third
Fig. 1 is a, plan view partly in section, and Fig.
path leading from the lowermost portion of said
2 is a vertical view, mostly in section, of one form
confined body. In the instance of this more 40 of apparatus.
'
speciñc aspect of the invention, the reduction in
Fig. 3 is a partial horizontal sectional view
pressure »of the sub-atmospheric pressureV gas is
taken as on the horizontal planes indicated by
not sufficient for the effects thereof to reach,
the broken line 3_3 of Fig. 2 looking in the direc
or extend downwardly into the quiescent lower
tion of the arrows.
zone thereby avoiding any functional influence 45
Fig. 4 is a plan view, partly in section, and Fig.
of the reduced pressure gas on the liquid in that
5 is a vertical view, mostly in section, of another
zone and more specifically avoiding turbulent
form of apparatus.
'
conditions which might otherwise exist if the
Fig. 6 is a horizontal sectional View taken as
functional effects of the vacuum or reduced pres
on the horizontal planes indicated by the broken
50 line 6_9 of Fig. 5 looking in the direction of the
sure reached down into said lower zone.
Important phases or aspects of the invention
arrows.
revolve about the features of construction of a
Fig. 7 is a horizontal View, some in plan and
novel closed tank or .vacuum type of unit into
some in horizontal section of another form of
which the liquid suspension is continually fed
the apparatus.
to a confined ever-changing body of such liq 55, Fig. '7a is in reality a part of the horizontal View
2,406,248
4
3
the gas Within the auxiliary compartment will
of Fig. ‘7.’ but since it may appear to be detached
from Fig. '7, it has been designated as Fig. 7a.
Fig. 8 is a vertical view, mostly in section, of
the apparatus of Fig. '7.
Fig. 9 is a plan view, partially in section, of a
portion of the apparatus shown in Figs. 'i and 8.
Fig. l0 is a horizontal view, partially in section
always continue substantially alike, to wit, at like
pressures always substantially less than that of
the pressure of the air outside of the apparatus;
pump means I8, II8 or ZIB for withdrawing air
or other gas from the gas-holding portions of
said tank and the auxiliarystructure associated
therewith and for thereby maintaining the pres
and partially broken away; it is a View taken as
sure of the gas therein substantially sub-atmos
on the horizontal planes indicated by the line
‘i3-_I3 of Fig. 8 looking in the direction of the l0 pheric; means for receiving clarified liquid pass
arrows.
'
~
-
' Ving thereinto from a lower or intermediate por
tion of the liquid body, to wit, means in the form
of apvbustle-collecting section I9, IIB or 2I9 lo
cated along an intermediate or lower portion of
feed-conduit or a draft tube construction' em
ployed in the apparatus of Figs. 7 and 8, Fig. l1 15 the tank I I, I i I or 2 I I; and clarified-liquid trans
ferv means 20, |20 or 220 embodying up-ilow pipes
being a horizontal view taken as on the plane
or conduits 2|, I2| or 22| leading from the bustle
indicated by the line I I-I I in Figs. 8 and 12, and `
section upwardly to the lower interior portion of
Fig. l2 being a vertical sectional view ytaken as. „
the auxiliary tank or liquid-height control struc
on the line of I2--|2 of Fig. 11 looking in the
direction of the arrows.
20 ture I6, I I 6 or 2 I 6, means providing a high liquid
Figs. ll and 12 are respectively a horizontal
sectional and a vertical View of a detail of the ,
Fig. I3 is a vertical sectional view of a detail of
fraction overflow weir or dam LO, ILO or 2LO
past which any outflowing clarified liquid must
pass before delivery as overflowed liquid into the
chamber or compartment 22, I 22 or 222 of the
Fig. 14 is a horizontal sectional View taken as
on the horizontal planes indicated `by the line 25 auxiliary structure I3, |`|6 or 2|3, and a downflow
pipe or conduit 23, |23 or 223 in the form of a
ifi-_I4 of Fig. 13 looking in the direction of the
construction which maybe employed at and for
the top of the tank shown in Fig. 8.
arrows.
l
Fig. 15 is a vertical sectional detail View of a
feature of construction which can be employed
in and for the'upper throat member of the tank
shown in Fig. 8.
In the drawings like parts have been given
like reference characters. Certain features or
operative parts that are common to each of the
forms illustrated will first be referred to.
Each form of apparatus includes or embodies
as an associated part thereof a feed-receiving and
initial treating basin I3, I IU or 2 I0; a closed tank
I I, III or 2 I I, providing a main separating com
partment wherein there is held an ever-changing
barometric leg extending from the lower portion '
of said compartments downwardly to- and into a
low clariñed-liquid release box or tank 24, |24
or MII-_identifiable as an efñuent-receiver-hold
ing a body or pool of clarified liquid into which
the low end of the barometric leg constantly dips
and by which it is liquid-sealed against the inflow
of outside air. The intake end 4I, I4I or 24| of
the feed supply pipe or draft tube I2, I|2 or 2I'2
is in submergence whereby it is always liquid
sealed against the entrance of outside air there
through into the tank I I, I II or 2| I. Because of
this fact and also since the barometric leg sec
tions already referred to> are liquid-sealed, the
structure of the apparatus is such that the sep
body of liquid suspension that is immediately
aration tank I'I, III or 2|I is constantly sealed
overlain by and exposed to gas maintained at
against the entrance of outside air 'thereinto
pressures substantially below that of the pressure
during the normal functioning thereof.
of the atmosphere outside of the tank; a feed
delivery conduit in the form of a draft tube I2, '
Feed. receiving basin 10, 110 or 210
|`| 2 or 2 I2 leading from the basin and terminating
Incoming
liquid suspensions are delivered by
in an upf-low discharge section which submerg
the pipe 33, |30 or 233 into an initial feed-receiv
edly delivers the incoming liquid suspension into
said ever-‘changing liquid body; means providing , , ing section 3|, I3I, or 23| of the basin I0, IIO, or
ZIB, to wit, at a locality thereof in front of the
a scum or froth-receiving launder I3, I|3 or 2I3 '504
partial partition 32, |32 or 232. The fed mate
having an overflow weir or overpass transfer
rial passes from this section 3 I', I3| or 23| through
edge SW, ISW or 2SW over which floating scum
passes from the top of said body into said laun- »
der; means for passing the scum, froth, or other
ñoating material from the scum launder to a ,
locality outside of the tank without permitting
an underpass space 33, |33 or 233 left below the
partial partition 32, |32 or 232 into a region
whereat it comes under the operative influence
of a gas-diffusing member in the form of a rotat
able impelling means 34, |34 or 234. Air or other
selected gas is supplied through a valve-controlled
pipe 35, |35 or 235. Under the operative influ
, pipe or conduit in the form of a barometric leg
I4, |14 or 2|4 the lower en'd of which continu GO ence of this impelling means the air or other gas
is intimately mixed and diffused within and
ously dips into a body of scum or liquid within a
throughout the liquid passing saidv agitating or
low scum-release box I5, I`I5 or 2I5, identifiable
impelling
means.
as a scum collector; an auxiliary tank or liquid
In
the
treating
of certain liquid suspensions, it
height control structure IB, IIS or 2I6 providing
the ingress of outside air into the tank, namely,
by scum outflow means provided by a downflow
a liquid-receiving and gas-holding compartment
or space 22, |22 or 222 extending to elevation sub-
stantially higher than that and to elevation sub
stantially lower than that of the scum-transfer
Weir SW, ISW or 2SW; a pipe or other passage
way providing means I‘I, II'I or 2I'1 for insuring
constant communication between the upper in
terior portion of the auxiliary compartment 22,
|22 or 222 and the upper interior portion of the
main tank I I, I II or 2| Iy whereby the pressure of
the gas within the main tank and the pressure of
is advisable to add a frothing agent, flotation oil,
or other chemical reagent and for such purpose
there is indicated and provided a holder 36, |36
or 233. A valve-controlled pipe 31, |31 or 231 is
also indicated as means by which the contents of
said holder 36, |36 or 236 may be delivered into
the liquid suspension so as to come under the op
erative influence of the impelling member 34, I 34
or 234 as it functions. A relatively large region
is provided within the basin at 38, |38 or 238 to
'permit the escape of large gas bubbles which may
remain in the liquid suspension. In order to in
` 2,406,248
5
sure sufhcientretention for the. liquid inthe sec
sedimentedi` material "may collect on: the bottom
of rtliis‘t'arrk and a valve-controlled discharge
means 52: is. provided" for the release or dis
charge of such sedimented material from the
interior of the tank` if and when it becomes
advisable todo so incident to the normal oper
ation of the apparatus.
It is Yclear from theA drawings and from that
whichk has preceded how theliquid can pass
from the bustle section i9 upwardly into the
pipe sections or conduits 2l. In the construc
tion of the form shown by said Figs. 1, 2 and
3 and the overflow weir means providing the
liquid-fraction overflow weir LO- is realized by
vertically adjustable overflow tips that sur
round the upper end portions of the conduits
2i. These overflow tips or weir members 25 vin
effect become continuations of or positionable
members associated with the pipes or conduits
tion 38, läßror'` 238',` 'there is provided withinithe:~
basin an. upstanding. partition or dam 39,' I‘ëfiror`
239 thetupper edge> 4.0, MB or‘240 of which‘d'e'
termines the minimum level of the liquid. in the
basin. ` TheV surface levelI ofthe overiiowedV liquid
in the receiving section 43, L43 or 243 therefor is
generally at elevation within a range including
fan "elevation somewhat lower’than -that o-f the
overflow weir iii), I di) or'f240; and an- elevation
higher thanN the `intake end 41', I4] or- 24| of thev
draft. tube l2,l H2 or ûlZ'whereby the intake end
ofthe> latter always continuesA in submergence.
An adjustable gate dit, HitV orA 242 isk provided so
asl to regulate the area of the entrance of the
intake end di, i4! or 24! of the draft tube1 oreven
to completely shut off the intake opening thereof
at the- will of an operator. ~ From the, foregoing
it will 'be noted that thel features of construction
just described with- regard to the- feed-receiving
andinitial treating' basins apply to each, form
shown.
i
2l. The adjustment thereof is effected through
the medium of the rods 53 which pass through
the sealing means 5A, providing packing ma
terial at 55 and which rods are actuated
'
The construction and functioning of> the basin
it), `I lil or 2li! has been described in order that
one may readily appreciate any pre-treatment
operations on the liquid >suspensions and the
steps employe'dflrespecting the supplying> of the
through the medium of suitably> supported
handwheels which function as adjusting nuts
55 on the screw threaded portions 5l of the
rods 53. The upflow conduit sections E‘I are
same to the separation tank Il, Hl or 2H
three in number as is apparent from Fig. 3.
wherein the liquid suspensions are further
The intake ends 26 thereof are symmetrically
treated and handled in such manner as to ob 30 arranged:> withV respect to the bustle section i?)
tain or eiîect the removal of certain suspended
of the tank Il and the upper outiiow ends
solids as froth, scum or other type of float frac
thereof are symmetrically arranged about and
tion-_each and all identiñable as scum thus
with respect to the >upper or intake end of the
used herein as a, generic` term-which flows out
downñow conduit or barometric leg 23.
wardly along ‘ one- path involving its passage
The upper overñow Weir edges of the tips or
over the transfer weirSW, ISW or ZSW into
members 25 collectively constitute or provid-‘i
the scum-receiving launder i3, H3 or 2| 3,"and
the liquid overflow weir LO which determines
the removal of a clariñed liquid-fraction along
the minimum, and in effect the normal opera
another path involving` its passage from a low
tive level for Vthe liquid within the tank. The
er or intermediate portion of the-'tank upwardly l e, elevation of each of these high liquid-fraction
towards and past a high liquid-fraction> over
overflow weir members or tips 25 is generally
flow weir or dam LO‘, ILO or ELO that regu
somewhat lower than that of the transfer-Weir
lates the minimum elevation for the surface,
edge SVI past which froth or scum must pass
level of the liquid maintained within the tank
on its way to the receiving launder i3 therefor.
By effecting the desired adjustment or eleva
and its passage as overiiowed effluent >into
chamber 22, |22 or 2‘22' and thence downwardly
tion of these members 25 and thereby of the
through the liquid-sealed barometric leg. >sec
tion before release tothe atmosphere.
TankA of Figs. 1, ’Z and 3
Respecting. the tank unit ofthe form shown
in Figs. 1, 2y and 3 it will vbe noted that this
embodiesl an.r upwardly~extendingf marginal
general elevation for the liquid overñow-weir
edge LO` one is enabled to effect a controlled
split delivery of the clarified liquid-fraction as
overflow material past the high liquid-overflow
weir LO and of the scum or float-fraction past
the scum or float-transfer weir edge SW.
The pump means i8 is relied upon to main
wall 115 circular in plan and a rising cap orr top
member ‘itv connected Vto the> upper edge por
tion of the marginal wall; any annular ringshaped member t1 connected to the lower por
tain the> vacuum or reduces atmospheric pres
« sure conditions within the tank so that the re
duction in pressure when compared with that
of- the atmosphere is by way of example in theY
neighborhood of approximately 9" of mercureî
tion of the marginal wall, extending outwardly
therefrom and disposed at> elevation somewhat
higher than that of the' lower edge 48» of the
marginal wall whereby the memberf- lll con
stitutes the roof or top portion of the bustle
section I9 and whereby the lowermost portion
49 of the marginal wall provides an inner wall
for the bustle sectionV I9; ran outer cylindrical;
member 50 extending downwardly from and
connected to the outer edge of the annular kring
member 41 whereby the cylindrical member 5l]
constitutes the outer wallv of the bustle section
I 9; and a dish-shaped or depressed Vbottom
member 5l which is connected to the member
5I! whereby the member 5l provides the lower
defines for the bustle section I9 and also serves`
t0 provide a floor for the tank.
,
` Inv the `functioning of the apparatus some
or thereabouts, or, as otherwise expressed, in
nl
the neighborhood of approximately 9 ft. of
water. The reduced pressure maintained with
in the tank must be suiiicient to cause a draft
effect whereby liquid will overflow the weirs, or,
as otherwise expressed., the reduced pressure
maintained within the closed top separation
tank l! must be sufficient whereby the atmos-`
pheric pressure of the outside air onthe overflowed liquid suspension in the receiving sec
tion blä- of the basin I!! is sufficient to effect or
»i force the transfer, as feed delivered into the
tank, of4 Vliquid suspension from the receiving
section 63v into and through the draft tube l2
and the upward delivery from the upper ex-l
panding end 63 of the rising upiiow section 52
' of the draft >tube into the ever changing body
2,406,248
Y
7
of liquidv undergoing treatment within the
closed top or main tank II'. The upper-most
or terminal edge of the rising section 62 is at
elevation lower than that of the overpass trans
fer edge of scum Weir SW or of the overflow
edge of liquid-overflow weir or effluent dam LO.
The liquid thus passed inwardly through the
draft tube is submergedly delivered within the
liquid-holding portion of the tank but at eleva
tion substantially higher than that of the lower
edge 48 of the marginal wall 45, or as otherwise
defined, at an elevation substantially above that
of the intake openings for the upilow pipes 2|.
It will be noted from that which has preceded
that the body of liquid within the tank is main
tained up to a level determined by the liquid
overilow weir LO and that above this general
level there exists the air or other gas which is
maintained, within the tank and itsI associated
auxiliary chamber, at a sub-atmospheric pres
sure determined vby the operating of the pump
I8. This vacuum or reduction in pressure of the
gas as compared with thatv of ‘the outside air has
is left at 65. Brackets .66 are secured to the
marginal wall 45 for supporting the plate 64 and
thereby the inner or terminal end Yof the draft
tube I2. There is a liquid-tight connection at
61 between the outside portion of the draft tube
and that portion of the tank structure whereat
the’ draft tube passes from the exterior of the
tank into the tank.
The inflow velocity of the liquid through the
tube is suñlcient to insure a delivery from the
upper'end of the tube of any and all solid matter
which may exist in the suspension supplied there
through to the interior of the tank Il but this
velocity should not be sufficient to cause a de
gree of turbulence within the upper portion of
the tank Kthat would prevent a proper splitting of
the floating material as a float-fraction and the
clariñed liquid as a clarified liquid-fraction.
For effective operation the distributing plate
64 may be disposed at an elevation, for example,
one and one-half feet to two feet lower than that
of the scum-transfer edge SW, but the elevation
selected may vary according to the type of liquid
suspension treated, the type of Scum-fraction or
on the body of liquid suspension overlain there
by and exposed thereto a functional effect which 25 split off desired, or the degree of vacuum or re
is greatest in the uppermost portions of theV
duced pressure employed for the gas overlying
liquid, and the effect thereof progressively de
the ever-changing liquid only within the tank
Il.
`
creases with respect to the liquid in the lower
The inflowing suspension is preferably Vde
levels. The vertical distance between the scum
transfer edge SW and the lower edge 48 of the
tained over the distributingplate a sufficient time
marginal wall 45 is therefore preferably made
whereby there is an effective rising of the float
so that it approaches the height of the column
l able material to the top of the liquid body as a
of water which indicates the pressure differential
Whole as the operative influence of the reduced
between the inside and outside of the tank. In
pressure gas within the upper portion of the
other words7 for the pressure reduction men 35 tank is most effective upon the uppermost por
tionY of the liquid body. . This horizontal plate
tioned, the vertical distance between either the
scum-transfer Weir edge SW or of the liquid
64 also leads to a more quiescent condition of
overflow weir edge LO on the one hand and
the liquid immediately underlying the same by
either the lower edge 48 or the entrance ends 25'
of the conduits 2| on the other hand, would be
compelling a realization of a major effect of the
reduced gas pressure on that portion of the
in the neighborhood of 9 ft., possibly somewhat
less, and the entrance or intake end 4I ofthe
supplied liquidl suspension while the latter is in
transit over and along the upper surface of said
plate 64.
draft tube I2 should be at elevation somewhat
lower than that of the lower edge 48. The edge
Reference has heretofore been made to the
48 roughly indicates the upper limits of an as 45 barometric leg or conduit section 23 by which
sured region of relative quiescence. The portion
overflowed clarified liquid is passed into the low
of the tank extending downwardly below this
clarified-liquid release tank or box 24. An in
spection of Figs. 1 and 3 will show that this
vline may be viewed as providing a zone of rela-_
tive quiescence favorable to the settling of solids
barometric leg 23.has been shaped so that the
therein and it is from this general region that 50 low tank or box 24 into which it extends is, in
the clarified »liquid is taken that is passed to
plan, located at one side of the draft tube I2
discharge from the'bustle section I9 to the ex
whereby the barometríc leg can pass downwardly
terior of the tank 'by means of the pipes 2 I, past
by the draft tube. The low tank 24 is in the
the high-liquid overflow weirs LO and ultimate
form of an open box or tube and a body or pool
55 of sealing liquid 68 is maintained therein up to
' ly downwardly through the barometric leg 23.
Respecting the construction of the draft tube
a, minimum elevation by a dam 69 having for
I2, this comprehends in succession a lower hori
the overflowV member thereof a weir member 'Ill
zontally-extending section 5I), the intake end
which is adjustable as to height through the
4I of which has a water-tight connection to the
medium of a rod ll having a threaded upper end
basin l0, aV curved intermediate or elbow portion 60 'I2 and an associated handwheel or nut 'I3 which
' 6I and a rising upflow section 62 terminating in
is suitably supported from and with respect to
an expanding delivery throat 53. The delivery
the tank or box 24. The lower discharge end of
end of the draft tube has associated therewith
the barometric leg constantly dips into the body
an annular distributing plate 54 which is sub
or pool of sealing liquid 68. The clariñed liquid
mergedly disposed within the liquid-holding por 65 flowing into said pool or body of sealing liquid
tion of the tank II. This plate is at .elevation
is ultimately released over said weir member 10
somewhat lower thanV that of the scum transfer
and ultimately flows from the box as through any
edge SW and at elevation substantially higher
suitable outflow means 14. Because of this func
than that of the lower edge 43 of the marginal
tioning ofthe structure described, this. box or
wall 45. This plate E4 is connected to the throat 70 tank and its associated parts is sometimes here
portion E3 of the draft tube whereby in effect
in referred to as a liquid-fraction release box
it becomes a horizontal extension or flange for
having a low liquid release weir l0. This box or
said throat portion. This plate is of less di
tank is also sometimes referred to as an eflluent
ameter than that of the interior of the marginal
wall whereby an annular downflow passageway 75
The description hereby given with respect to
receiver.
_
’
`
'
25406,’248
this clariñed liquid-release box substantially ap
plies to the similar construction in the form of
each of the other ñgures.
As to the barometric scum-discharge leg I4
10
tight closure for the top of the tank is completed
and whereby there is also provided »the scum-re
ceiving trough or launder »I I3 that progressively
increases in depth and cross-sectional area as it
and the release box I5 into which it extends, it C3 approaches the passageway |81 leading into that
portion of »the scum-discharge structure which
will be noted that a body or pool 'I6 of sealing
includes the barometri‘c leg IM,
liquid is maintained therein because of a dam
With respec-t to the scum-discharge structure
structure 'iî which can be positioned as to over
illustrated in this 'ligure it will be noted that it
iiow elevation by removable or replaceable over
embodies a hollow casing l|88 that is connected
iiow boards T8. Tins body or 4pool of liquid ‘I6
to the tank I I I so asto be in communication with
may be provided by liquid initially supplied
the scum AWeir H8 through the 4medium of a pipe
thereto as a sealing medium for the discharge
|84 that provides ‘the aforementioned passage
end of the barometric leg which dips into the
way |87. The yhollow casing |88 is made up of
same. Such sealing body or pool will be main
tained because there will always exist more or
less liquid which passes the scum weir or transfer
a hollow body member `I 8S and a cover member
IBG. Itv also has a transverse bañie ISI Yextending
edge SW with the floating material that passes
into the scum-receiving launder I3. The over
downwardly from the cover member |88. rI’he
lower end of the baille terminates at elevation
substantially lower than that of the opening or
passageway ,§81 and higher than that of -the
ñoor portion or bottom |92 of -t-he casing- In
this manner a chambered structure is provided
wherein any gas sucked therethrough is rídrled
or freed ci -liquid or solid particles which may
have :been entrained or in transit therewith.
A wet vacuum pump 1.93 is connected by suc
tion piping |98 controlled »by stop valve |85 to
the hollow casing |88 in a‘manner whereby it is
in direct communication with Athat upper portion
of the ~`chamber therein which is at vthe side of
the baille opposite the :passageway or intake
iiowed or release scum which passes the Weir
edge provided by the upper board 18 is ultimate
ly passed for the desired disposition by >any suit
able means as for example by a conduit or pipe
1S. This overflow box or tank typifies the over
flow box or scum release means as shown in'the
other forms herein illustrated and is sometimes
referred to as a scum -or float-fraction release
box having a low scum-release weir 11. It is-also
sometimes referred to herein as a scum collec
tor.
The description hereby given with respect to
the scum collector or ñoat-‘fra‘ction release box
having a low scum release weir substantially ap
plies to the similar construction in the form of
each of the other ñgures.
Apparatus of Figures 4, 5 and 6
preferably vmaintained in a low box |83 having
ln the main the features of construction of
this apparatus correspond to the apparatus of
Figs. l to 3 inclusive already described.
In the tank III of this second form there is
the upwardly extending marginal wall |45 which
is circular in horizontal cross section.
At the
lower portion of this wall there is the structure
providing the bustle section IIS and the dish
shaped or depressed member ISI providing the
bottom of the tank. The closure top for the tank
is provided by an upwardly and inwardly-ex
tending roof member I8| and an inverted cup
shaped member |84. The roof member IBI in
shape resembles the surface of a frustrum of a
cone and terminates in an upwardly-extending
cylindrical throat portion |82 that provides an
upñow opening the center of which is concen
tric with the marginal wall |115. The lower edge
of this roof member has a gas-tight connection
to the upper edge of the marginal wall |45. In
the construction shown there is associated with
the -ñxed cylindrical throat portion |82 a verti
cally-adjustable Weir, ring, or cylindrical mem
ber |83 of which the upper or overpass transfer
edge portion provides the horizontally-extending
scum overflow weir ISW.
opening |81 leading tozthe chamber. A descend
ing pipe It@ leads Afrom the discharge ‘side of the
pump. The lower end of :this descending pipe
I9@ dips into apool of-'sealing liquid |81 that is
The means by which
this Weir member |83 is supported and vertically
adjusted will later be described.
In order to complete the capping or top c10
an `overflow weir ‘|99 past which there is a re
lease of overflow liquid lfrom the box |98 into the
compartment ’£88 and therefrom through the dis
charge opening 118|. The .barometric leg or scum
conduit-l -| i4 is connected‘toithe’hollow casing and
leads downwardly from the lower .portion of the
separating chamber or lcasing' |88. The lbaro
metric leg I I4 is provided with a stop valve |65
-. which can be opened or closed at will or even ad
justed-‘to a partially open position at the will of
an operator. The valve H15 can Vhe left open and
the valve I§5 closed and in that instance the
scum discharge construction will function ex
actly'the saine as the scum discharge leg III of
the form previously described.
It is feasible, however, in connection with the
apparatus just referred to to omit the operation
of pump I I 8 or even to operate it at a rate some
what less than that required to maintain the
vacuum or desired reduced pressure conditions
for the gas in the tank I || and in such instance
in order to take care of the vacuum requirements
the wet vacuum pump |93 is brought into opera
tion. In such instance if the valve 5&5 is open the
scum which embodies some liquid will be sucked
into the hollow casing i88 with the gas. Therein
the scum and gas directly contact the baiiie I 9 I and
this causes much of the liquid and entrained solids
to drop into the lower portion of the casing while
sure for the tank there is employed the inverted
cup-shaped member |84 embodying a top or up
the gas continues on its way’to the pump |93.
In this way the entrained liquid or solids, or a
in position so that it is eccentric or off center
the low release box i I5. The gas and such scum
as may continue entrained therewith will pass
major portion thereof, will enter the harornetric
permost portion |35 and a downwardly-extend
leg Ile, pass the valve iîiä thereof and finally
ing flange or rim portion |85` which is circular in
horizontal cross-section but which is assembled 70 descend therethrough and from the leg iifi into
with respect to the cylindrical throat portion |82.
The eccentrically-disposed rim portion |86 of
the gas-tight top or capping member |84 is con
nected to the roof member I8I whereby the gas
into the pump |33 and will thereby be delivered
into and ultimately from the descending pipe |95
75 either into the box |88, or for example, to and
2,406,248
11
12
through a valve-controlled discharge pipe |06.
Mention has heretofore been made that the
scum'weir ISW as provided by the member |83
is vertically adjustable. This is -accomplished
terminates as the expanding throat 26%- by which
the incoming feed is submergedly delivered with
in the liquid-holding portion of the tank, namely,
at an elevation somewhat lower than that of the
overflow weir ZSW but substantially higher than
that of the lower edge 243 of the marginal wall
245.
sealing means |10 having packing |1| engaging
The top of the tank 2|| as shown by Fig. 8
the rod. The upper end of the rod |66 is pro
has an upwardly and inwardly sloping roof mem
vided with screw threads |12 that are engaged 10 ber 210 that provides a cylindrical upflow throat
by a hand-wheel or adjusting nut |13 which is
portion 21| which is concentric' with the mar
suitably supported from the cap member |84
ginal wall 245 and also with the upñow section
through the medium of bracket member |14.
262 and terminal throat portion 253 of the feed
An inspection glass is provided at the top of the
supply pipe or draft tube 2|2. A vertically-ad
tank by the window structure |15. Means for 15 justable ring-shaped member 212 is arranged
illuminating the interior of the tank may be
about the throat portion 21|. This member 2_12
provided by a member having an electric light
provides the scum overflow Weir ZSW and the
|16.
adjustment thereof is attained through the me
As to the outñow mechanism for the clarified
dium of screw threaded rods 213 which are ver
liquid, it will be noted that the rising members 20 tically positioned through the medium of suit
or upflow _pipes | 2| thereof extend to and ter
ably supported handwheels or nuts 214. As will
minate at the lower end of the auxiliary tank or
be manifest from an inspection of Figs. 8 or 13,
compartment structure ||6, namely, in the com
the escape of gas past these rods 213 is prevented
partment or section |21 hereinafter referred to.
because of the packing and sealing construction
This tank or compartment structure ||6 has a
provided at 215. The top portion of the tank
partition |25 that includes a vertically-adjust
is provided by a capping member 216, a down
able overflow member or dam |26, that provides
wardly and outwardly sloping member 211 and
the high liquid-fraction overñow weir ILO. The
a downwardly and inwardly sloping portion 218.
partition thus provided divides the lower interior
As to the member 211 this, in horizontal section.
portion of the chamber of the auxiliary tank ||6 30 is circular in plan and it is disposed so that it is
into a section |21 for receiving the liquid upflow
concentric with the scum weir 2SW, or as other
ing into the chamber, and a section |28 for receiv
wise expressed, with the ring member 212 pro
ing the liquid after it has overñowed the weir
viding said weir. As to the member 218 this in
member |26. From the compartment or receiv
horizontal section is circular in plan, but it is
ing space |28 the overñowed liquid passes into 35 located and disposed so that any such horizon
and through the depending barometric leg sec
tal circular section thereof is eccentric with re
tion |23 and therefrom into the pool of liquid in
spect to the scum weir 212 whereby there results
through the medium of a spider |68 which is
carried at the lower end of a vertically-adjust
able rod or stem |69. This rod passes through a
the low release box or eiiiuent receiver |24.
The means for adjusting the weir or effluent
a scum launder or trough 2|3 which progres
referred to or the adjustable weir member |83 pro
viding the scum transfer edge | SW of this form.
v21|! are connected so as to provide a gas-tight
structure and the member 218 is in turn pro
vided with a gas-tight connection between it and
sively increases in depth in passing towards the
overflow dam |26 is similar to that described in 40 discharge section thereof which leads into the
connection with the adjustable gates heretofore
barometric leg 2_|4. 'I'he members 216, 211 and
Apparatus of Figs. 7 to 12 inclusive
the roof member 269. The packings 215 about the
The form of apparatus of Figs. '7, 8 and 9 em
rods 213 are disposed in pockets provided on the
Ibodies the fundamental features of construction
member 211 as is manifest from Figs. 8 and 13.
specifically described with respect to the first
The means 220 for passing the clarified liquid
form shown in Figs. 1, 2 and 3. It also embodies
from the lower or intermediate portion of the
certain details of construction quite similar to
tank, to wit, from the bustle section 2|9 em
those shown in connection with the second form 60 bodies the upñow conduits 22|, the auxiliary tank
shown in Figs. 4, 5 and 6. In addition, this third
or chamber-providing structure 2|6 and the
form has certain features or details of construc
downflow conduit or barometric leg 223. In the
tion peculiar to itself. This third form of appa
instance of this structure, it will be noted that
ratus is of a type which is peculiarly adaptable to
the upper ends of the upflow or rising conduits
divide liquid suspension having settleable solids 55 22| are in alignment (see Fig. 7) and terminat
therein into three fractions, namely, such as may
ing in the lower portion of auxiliary tank 2|6
be considered (l) a froth or scum-fraction, some
so as to deliver the liquid into section 221 of the
times referred to as a float-fraction; (2) a liquid
chamber 222 of that tank. The lower portion of
fraction from which suspended solids have been
the chamber 222 is divided by the partition'225
floated and from which heavier solids have been 60 and adjustable weir member 226 of that par
settled whereby there is left the liquid freed of
tition into said section 221 and section 228, the
such solids, namely, a fraction which is generally
latter of which is disposed for receiving over
referred to as the clarified liquid-fraction; and
flowed clarified liquid passing thereto vfrom
(3) a fraction essentially containing heavy solids
‘which readily deposit as sediment at the bottom 65 chamber 221 over the adjustable member 226 or
weir 2LO. The elevation of the weir 2LO, name
of the separation tank and which are progres
ly, of the high liquid-fraction overflow weir or
sively removed therefrom as a settled-solids frac
effluent overflow dam as it is frequently referred
tion.
to is generally preferably lower, it may be only
In this form of apparatus the incoming sus
pension is conducted from the receiving and 70 slightly lower, than the elevation of the scum
Weir or overpass transfer edge ZSW. »
treating basin 2||l into the draft tube or pipe
In this form of apparatus provision is made
2|2 which has a horizontally-extending intake
whereby there may be ensured a general eleva
section 260, a curved intermediate section 26|
leading to an enlarged elbow section 268 from
tion for the surface level of the liquid which is
which there rises the upñow section 262 that 75 within a range between pre-determined maxi
2,406,248
13
mum and minimum elevations.
.14
In order to ac
of the scum Weir A25W. The particular elevation
complish this, there is provided means for main
taining functionally separated from the scum, a
relatively segregated small body of liquid which
is in constant communication with the lower por
tion of the main quantity of the liquid in liquid
holding section of the tank. By way of illus
tration such segregated liquid is shown as a body
the character of material which has to pass the
scum Weir ZSW. This vacuum pump 219 deter
mines the vacuum or degree of reduced pressure
280 which its maintainedin a space within a con
a vacuum or too much reduced pressure within
ñning means 28 l.
This body of liquid is in con
stant hydraulic communication with liquid in the
lower liquid-holding portion of the tank, as for
example, by being established in communication
with the liquid in bustle section 2|f9 through the
medium of a pipe or other equivalent communi
cating member 282.
The upper portion of the
employed is primarily dependent upon the type
of incoming material supplied for treatment and
Within the entire tank and associated system
and in orer to prevent the existence of too great
10 the system the upper nozzle 281 has been provided
so as to commence to suck liquid and liquid only
just so long as the elevation of the liquid in body
286 exceeded or tended to exceed the elevation
of the intake Section of that nozzle 281.
By the
15 adjustment of these two nozzles one can substan
tially control the quantity flow of liquid into the
member 28| is in constant gas communication
with the upper interior portion of the tank 2| I.
tank 2| |_. or as otherwise expressed, the height
of the liquid in the tank whereby the quantity of
This may be accomplished through the medium
outflow over the weirs will be under the control
of the pipe or communicating member 283, par 20 of that liquid which is thus adjusted as to height
ticularly if the conñning member 28| is located
by the associated nozzles 265 and 281.
outside of the tank 2| |. There is arranged for
A mechanical raking mechanism has been pro
use in conjunction with this segregated body of
vided for the tank 2| |. Thisv is embodied by a
liquid 280 a wet vacuum type of pumping means
suitably driven and suitably supported horizon
having two intake Vportions preferably provided 25 tally-turntable bearing member 266 which is
by adjustable intake nozzles, namely, a Wet pump
carried on a stationary bearing member 26 |. The A
ing means 219 having a lower intake means 284
turnable bearing member 260 carries a vertical
provided with a lower adjustable intake nozzle
shaft 262 which extends downwardly through a
285 and an intake means 286 provided with an
sealing construction 244 on the member 216,
upper adjustable nozzle 281. The discharge from
downwardly through the upflo-w section 262 and
this pump is through the medium of a discharge
the enlarged elbow portion 268 of the draft tube
leg 288 which is arranged to dip into a low liq
-‘M2 to a locality Within the lower region of the
uid-holding box 29| containing sealing liquid 292
tank 2|| whereat it supports a rake-carrying
for sealing the discharge end of this pipe. The
member 229 comprising outwardly-extending
box 292 has an overñow dam or release Weir 293
arms 246 from which depend sediment-engaging
(see Fig. 7E) a section 296 for receiving over
and conveying means 341 provided by a chain
ñowed liquid, and an outñow pipe 295. It is
disposed for engaging sedimented material that
feasible, however, to eliminate the employment
is lodged upon the floor provided by the tank
of the discharge leg 288 as a barometric leg but
bottom 25|.
in that case the pump should be of a type which
Sedimented material is passed from the lower
would be able to discharge liquid therefrom with
portion of the tank 2|| through the valve-con
out permitting the back flow of air therethrough.
trolled conduit 252. In the instance of this con
Stop valves may be provided at 296 and 291 re
struction this conduit has two valves or gates
spectively for the lower and upper suction lines
embodied therein, namely, an upper valve or
28-4 and 286 of the pump.
45 gate 261 and a lower valve or gate 269. Normally
As to the lower nozzle member 285, it is to be
the upper valve is closed and the lower one is
noted that this is adjusted in any suitable man
open. Immediately below the lower valve 269
ner as by the handle 289 so that it can swing
there is a closed chamber structure 263 having
an open top body member 294 and a top member
raise or lower the free or tip end of the nozzle 50 265. In the chamber of this structure there is a
member. It will also be noted that this nozzle
sands-transfer valve or wheel 266 having sands
about a horizontally-extending axial bearing to
member and the pipe extending therefrom is
receiving pocket portions or openings 261 there
constructed to provide a downward passage no
in. This sands-transfer wheel is horizontally
part of which rises above the intake end of the
turned through the medium of a vertically-ex
nozzle. In other words, any liquid entering the 65 tending shaft 268 and speed reducing and power
tip end of the nozzle will necessarily gravitate
transmission mechanism 264 driven from the
towards the pump; such liquid does not have to
rotor 295 of motor 266. Sands passing to this
raise over a weir or any elevated point on its
wheel 266 are received in the successive pockets
way to the pump. On the other hand, it will be
or openings and are transferred by the wheel
noted that the upper nozzle 281 which is adjust 60 to a locality whereat it is delivered or passed
able through the medium of the handle 290 is po
into a transfer conduit 296 from which it is clis
sitionable so that the intake end or movable tip
charged into a receiving chamber or tank 299
portion thereof swings up andd own and any ñow
from which the sand is conveyed to a locality
of liquid or gas into that nozzle is raised from
from the apparatus by means of a sprocket, chain
the elevation whereat liquid is usually received 65 and iiight conveying mechanism indicated at 249.
thereinto whereby the liquid generally has some
In order that there may be avoided any undue
inward movement, due to an up?low passageway
downward pressure on the sand wheel, it is
leading from the intake tip of the nozzle prior
feasible to make this tank or receptacle 299 rela
to entry into the downflow portion of the upper
tively deep so as to hold water therein of suffi
suction line 268
cient depth to provide substantial counter-bal
70
In the normal operation of the apparatus the
ancing pressure operative against the underside
free end of the nozzle 285 of the lower suction
of this wheel 266. If for any reason it is desired
line 284. is raised to a position higher than that
to empty the tank 2|| this can be readily ac
of the overñow weir 2LO; in some instances, it
complished even when the lower valve or gate
maylbeiraised to-elevation'even higher than'that 75 269 is closed merely by opening the upper valve
2,406,248
15
16
261. When the downward passage of sand
through the conduit 252 is prevented by the clos
Further respecting Figs. 7 to 12 inclusive
Reference is now made to the construction of
the draft tube 212 and the associated baffle or
distributing means at the terminal thereof as
should occasion require.
Cil shown in Fig. 8. Here it will be noted that
There may be instances where it is advisable
instead of employing a flat distributing disc as
to inject gas or liquid into the elbow section of
is the situation in the instance of two forms
the draft tube, namely, in the form of jets which
previously described, there is a downwardly and
extend into the elbow section and which are
upwardly directed towards and into the upflow 10 outwardly sloping member 250 and there is
a passage area 258 between the upper sur
section 252; such mode of injection is in-dicated
face and outer edge of this member 250 and
in Fig. 12 by nozzle type of injector head 253.
the inner contour of the top member 210
The liquid or air passed to this head 253 is sup
of the tank. The upper surface of this member
plied as through the medium of a pipe 254 which
is on the delivery side of a pump 255 the latter 15 250 follows the contour of a frustrum of a cone
and ensures suiücient retention thereover of the
of which has a valve-controlled air suction line
liquid-solids suspension whereby it continues un
250 leading from the upper interior portion of
der the relatively direct or most powerful in
the tank 2l l and a valve-controlled water suction
iluence of the reduced pressure existing within
line 251 leading for example from the liquid
holding compartment 221 whereby clarified liq 20 the upper portion of the tank. Because of its
shape the distributing member 250 provides for
uid from the tank may be returned for any pur
the gradual downward slipping of any settable
pose desired into and through the injector or
solids which are not susceptible to the influence
distributor head 253.
of the reduced pressure of the air within the
It will also be noted in this connection that
any pumping of air or other gas from the upper 25 tank. Immediately below this distributing mem
ber 250 there is a downwardly and inwardly ex
interior portion of the tank back into the tank
tending member 259 which permits an easy,
or any pumping of liquid from any portion of
gradual and relatively unobstructed rising of any
the unit back into the tank does not change or
material tending to rise from the region immedi
alter the reduced pressure conditions of the gas
within the tank or height of liquid within the 30 ately below it, particularly of any material tend
ing to move upwardly because of the reduced pres
tank. There are instances where it may be ad
sure conditions maintained within the tank.
visable to inject air into the froth or floating
This member 259 also serves as a means by which
material in the upper portion of the tank in order
the inner or upper end section of the draft tube
to function as a means for impelling the floating
material towards and past the scum overflow 35 derives support from the marginal wall 245
through the medium of the members or brackets
Weir or float-transfer edge ZSW. Such a means
359.
is indicated in vertical section by Fig. 13 and in
With respect to the liquid-height control as
plan by Fig. 14.
ing of the lower gate or valve 259 one is enabled
to obtain access to the sands transfer wheel 206
realized by the adjustable nozzles 285 and 281,
Respecting Figs. 13 and 14
40 it will be noted that these nozzles and the pump
ing structure associated therewith can be loIn these figures the distributing head for the
cated anywhere with respect to the apparatus
air is indicated by 300; the jets of air 30| deliv
whereby it can engage and control a segregated
ered therefrom have a tangential arrangement
portion of the body of liquid within the tank
or disposition as is clear from Fig. 14 whereby
they tend to impart a slight swirling and progres 45 that is preferably separated or bailled from the
scum within the tank whereby clear liquid rela
sive outward movement on the ñoat material to
tively free of ñoating material will come under
wards the scum overñow weir 2SW, and thus aid
the inñuence of these nozzles. A prime purpose
in eiîecting the passing of the floating material
past the weir Without compelling the possible
of these nozzles is to maintain and establish
employment of an undue amount of ove-rilow 60 minimum and maximum level elevations within
relatively ñne Aand carefully selected limits. For
liquid to accomplish that purpose. The gas em
this purpose these nozzles could therefore be
ployed for this purpose is preferably some of the
placed directly within the main tank itself or
reduced pressure air or other gas which is sucked
within the liquid-holding portion of the aux
from the upper interior portion of the tank 2H
into the pump 302 through the suction line 353
iliary tank structure 2|6, or as otherwise ex
indicated in Fig. 13 and delivered through the
line 304 into the distributing head 300. Figs. 13
and 14 are indicative of a type of construction
which can be used in connection With the tank
2l I and particularly in connection with the form 60
of apparatus shown in Fig. 8.
Figs. 13 and 14
should be therefore viewed as details of con
struction Wlu'ch are used in and as part of the
form of construction shown in Fig. 1l.
pressed, they do not have to be embodied in and
as part of an outside structure or chamber.
General
In each of the forms shown the incoming liquid
suspension is treated as by the dispersion of air,
and other material, and throughout the same,
namely by the air distributing and dispersing
means employing the impeller 34, |34 or 234.
65 Such treated liquid suspension is preferably held
Respecting Fig. 15
just long enough within the treating station or
In Fig. 15 there is illustrated a modified form
basin l0, H0 or 2li) to permit the escape of large
of adjustable scum overflow weir which is here
gas bubbles but whereby th'e small dispersed gas
in designated as 342 as it may be substituted in
bubbles will continue therein. The pre-treated
place of the scum overflow Weir 212 shown in 70 liquid suspension is conducted through the draft
Fig. 8. The type of overflow Weir just referred
tube and is thereby submergedly delivered up
to leads to a steady and easy transfer of froth
wardly into the body of liquid or liquid suspen
material by avoiding a sharp edge or ledge over
sion maintained within the separating chamber.
which the floating material must pass on its
In this chamber under the influence of the re
way into the scum launder I3.
u duced pressure gas therein there is effected a ris
2,406,248
18
ing of the float material as. froth, scum, or otherW-»f' trough, scum transfer means for passing scum
floating material to the top of the liquid within
from the trough to a region outside oi' the tank
the tank. The collecting floating material passes
and means for minimizing leakage of outside air
the overpass transfer edge of overflow Weir SW,
into and through said scum transfer means;
means for providing gas communicating passage
ISW or 2SW. thence into the scum launder i3,
l i3 or 2 i3 from which it is delivered to a locality
area between the Aspaces for gas overlying the
outside of the tank without permitting the in
liquid in the tank and the liquid in the chamber;
and means for sucking gas from at least one of
gress of air into the tank Il, Ill or 2li, as the
said spaces for subjecting liquid underlying the
case may be, namely. through suitable discharge
means such
is provided by the barometrlc leg. 10 gas- within both spaces to sub-atmospheric pres
sure; said eflluent-outñow means having its dam
construction M, il@ or 2M. Clarified liquid from
operatively disposed with respect to the chamber
a lower or intermediate portion of the tank, to
and` including an intake section for receiving
wit, from a bustle section I8, H8 or 219 thereof,
liquid passing thereinto from a region within the
passes through the upflow conduits 2 l, 121 or 221,
past the high liquid-fraction overflow weir or 15 tank which is at elevationv lower than that where
at feed liquid is submergedly delivered into the'
eñiuent overflow dam LO, ILO or BLO from which
tank from the discharge terminal of the feeding
it is delivered as overñow eñiuent into a region
means, a conduit leading from the intake section
from which it passes through a barometric lee,l
to the chamber whereby tol realize a column of
construction or other equivalent means to the
exterior of the unit without permitting the en 20 upflowing eflluent which must pass as overflow
from said dam, an effluent receiver for retaining
trance of air into the tank. In the form shown
a quantity` of effluent asa. sealing medium, and an
in Fig. 8 there is provided means whereby a
overflowed-elliuent conduit extending downward
three-way of fraction split can be carried out
to obtain a froth or neat-fraction, a clarified
liquid-fraction, and
sedimented solids-fraction.
ly from- a portion of the chamber at the delivery
side ofthe dam and- dipping in the sealing me
dium for providing a barometric leg.
Suitable window structures each having a
2. Apparatus according to claim l, in which
transparent medium as glass is provided as at C,
the‘dam is located within the auxiliary chamber,
CC or CCC whereby the interior conditions with
and in whichv the overpass edge of the scum
in the upper portion of the unit can be observed,
particularly as to the overñow conditions for the 30 trough extends horizontally and is cüsposed at
an- elevation somewhat higher than that of the
scum in the region of the scum weir, or for the
overflow edge of »the dam.
outflowing liquid in the region of the liquid
~3. Apparatus according to claim l, with the
fraction overflow weir.
addition of means for effecting relative vertical
These windows may be located and availed of
for observing operating conditions in any part 35 adjustment as between the overpass edge of the
of the structures. The window structures are
preferably large enough to serve as manholes or
access openings. Such window structures are
normally closed and the access openings provided
thereby are indicated in the different forms,
scum troughv on the one hand and the overño-w
edge of the dam on the other hand.
4. Apparatus according to claim l, having
means positionable from outside of the apparatus
for effecting relative vertical adjustment as be
tween the overpass edge of the trough on the one
namely, by reference characters C, CC or CCC.
hand and the overñow edge of the dam on the
Novel features of construction revolve about
other hand.
the mode in which the different parts of the
5. Apparatus according to> claim 1, wherein the
tank and its associated features are brought into
cooperative organization and arrangement. Nov 45 dam has means extending from it to a place of
atmospheric pressure whereby to adjust the ele
el features of the construction described are set
vation of the overflow edge of the dam and there
forth and are more particularly defined in and
by the overflow elevation of liquid in transit
by the claims hereof.
through the auxiliary chamber thereby control
This application is a continuation of and a full
substitute for and in place of parent application 50 ling the level of the liquid within the tank.
6. Apparatus according to claim 1, wherein the
Serial No. 436.972, ñled February 14, 1942.
tank has at the lower portion thereof an ellluen-t
What is claimed is:
collecting section annular in plan providing the
l. Apparatus comprising a closed tank adapted
intake section of the eilluent outflow means and
to hold an ever-changing body of liquid suspen
wherein the eiliuent outflow means comprises a
sion being treated; an auxiliary chamber adapted 65 plurality of up-flow pipes each constituting a con
to hold liquid with a space for a gas atmosphere
duit leading to the chamber from the thus pro
overlying and contacting the liquid; eliluent-o-ut
vided. inlet section and as to which pipes the
flow means including a dam having within said
lower intake ends thereof are symmetrically
chamber an overflow edge lower than that of the
spaced and are in communication with said col
uppermost interior portion of the tank and cham
lecting section while the upper ends extend into
ber whereby normally to determine the surface
the auxiliary chamber whereby to provide indi
level of the body of liquid in the tank sufficiently
vidual ellluent overflow members that collectively
low to provide therein space for a gas atmosphere
function as the overflow dam.
overlying and contacting the liquid body; feed
i’. Apparatus for performingr a continuous
65
ing means for delivering feed liquid submergedly
process for separating and removing suspended
to the liquid body and having a discharge ter
matter as scum from a liquid suspension, which
minal at an elevation lower than that of the
comprises
a closed tank. providing a liquid-hold
overflow edge of said dam; means normally seal
ing portion for the detention therein of an ever
ing said feeding means against leakage of out
changing body of such suspension having a liquid
side air thereinto and thence into the tank; scum
level normally maintained up to a minimum ele
removal means for withdrawing scum floating on
vation and providing an upper interio-r portion
the body including an open top trough having an
affording a gas-confining space wherein there
overpass edge at an elevation approximate that
existsv a gaseous medium at sub-atmospheric
of the overflow elevation of said dam for receiv
ing floating scum passing over said edge into the 76 pressure that contacts said body; a closed auxil
2,406,248
19
lary chamber providing a liquid-receiving portion
and an overlying interior portion añording a
gas-confining space; means defining a commu
nicating gas passageway between said gas-con
fining spaces whereby the sub-atmospheric pres
sure conditions therein continue substantially
alike; outflow-conduit means having a low intake
for receiving liquid from the ever-changing body
within the tank and leading upwardly to the
auxiliary chamber for holding a column of up
ing an overpass edge at an elevation higher than
that of the overñow edge of said dam but of suf
ficiently low elevation for permitting passage
thereover of quantities of scum floating on the
liquid body within the tank; a closed conduit pro
viding a barometric leg extending from a portion
of said hopper downwardly into the scum col
lector and terminating at an elevation lower than
i that of the scum outfiow weir; and pumping
means connected for withdrawing quantities of
gas from the gas-communicating upper portions
within the auxiliary chamber and having an over
of the tank and chamber whereby the pressure of
flow elevation lower than that of the top interior
gas remaining therein is sub-atmospheric.
of the closed tank for determining said minimum
9. A unit of the class described for functioning
elevation for the liquid level in the tank; gas 15 in association with a feed supply basin for hold
exhausting means operatively connected to the
ing a supply of liquid suspension, with an elilu
upper interior portion of the apparatus for re
ent receiver having a release weir determining
moving gas from said gas-confining spaces
the minimum depth of the eii‘luent retained in the
whereby sub-atmospheric pressure is maintained
receiver, and with a scum collector having a scum
therein; suspension feed means having a dis 20 outflow weir determining the minimum depth of
charge terminal at elevation higher than that
released liquid passing with scum into said col
of the intake of the outflow conduit means but
lector; and which unit comprises a closed top
lower than that of the overflow edge of the dam
main tank for holding within the lower portion
for submergedly delivering such suspension as
thereof an ever-changing liquid body of supplied
feed material into said tank; means for normally y
suspension fed thereinto and Within the upper
sealing against leakage of outside air into and
portion thereof a gaseous medium at sub-atmos
through said feed means and thence into the
pheric pressure to which said body is directly ex
tank; an effluent receiver for retaining a quantity
posed; barometric leg means for discharging ef
of the effluent as a liquid sealing medium; conduit
fluent therethrough including an auxiliary com
means providing a barometric leg for conducting 30 partment, an overflow dam functionally dividing
overñowed effluent from the auxiliary chamber
the interior of the auxiliary compartment intoY
downwardly into the receiver and dipping into
pool retaining portion and over?lowed liquid-re
the sealing liquid therein; a scum trough located
ceiving portion, a conduit section for upflowing
in the upper interior portion of the tank and hav
effluent leading from a liquid-holding portion of
ing an overpass edge at elevation approximate
the main tank upwardly to said pool portion, and
that of the overflow edge of said dam; means for
a conduit section for gravitating effluent leading
discharging scum from said trough to the exterior
downwardly from said ove-rñowed liquid-receiving
of the apparatus and means for minimizing leak
portion into the eliiuent receiver for providing a
ñowing effluent; effluent overflow dam disposed
age of outside air into and through said last men
barometric leg terminating therein at elevation
tioned means and thence into the tank.
40 lower than that of the release weir thereof, the
8. A unit of the class described comprising in
overflow elevation of said dam being lower than
operative combination and arrangement a gas
that of the uppermost interior portion of the closed
tight tank; a gas-tight auxiliary chamber, means
top of the main tank but higher than that of the
providing gas communication between the upper
intake portion of said upñowing effluent conduit
portion of the tank and the upper portion of the 45 section thereby determining a minimum normal
chamber; upflow conduit means leading from a
liquid-level of the liquid within the tank, and the
lower portion of the tank into the lower portion
auxiliary compartment having within the upper
of the chamber; an effluent receiver exposed to
portion thereof a gas-holding space extending to
the atmosphere for receiving liquid discharged
elevation substantially above that of the overflow
thereinto and having a release weir for retain
50 elevation of said dam; means providing a pas
ing liquid in the receiver up to the elevation of
sageway between the gas-holding spaces of the
the weir; a conduit providing a barometric leg
tank and of the compartment whereby the same
extending from the lower portion of the chamber
sub-atmospheric pressure is realized in said
downwardly into said effluent receiver and ter
spaces; pumping means connected and disposed
minating at elevation lower than that of said 65 for withdrawing quantities of gaseous medium
release Weir; an eiiiuent overflow dam operative
from said passageway connected gas-holding
ly disposed with respect to the chamber and hav
spaces within the tank and Chamber for main
ing an overflow edge over which liquid in transit
taining the pressure therein sub-atmospheric;
to and through said chamber must pass before
feed-conducting means comprising transfer pip
entering said downñow conduit, the elevation of
ing having a continuously submerged intake lead
which overflow edge is lower than that of the
ing from the liquid-holding section of said feed
uppermost interior portion of the tank; a feed
supply basin and terminating within the main
supply basin for holding the material to be treat
tank at elevation lower than that of the overflow
ed in a manner whereby said material is exposed
elevation of said dam but at elevation higher than
to the atmosphere; feeding means including a
that of the intake portion of said up?lowing efliu
draft tube for transferring feed material from
ent conduit section; and a scum trough within
said basin into the tank at an elevation lower
the tank having an overpass edge at elevation
than that of the overñow edge of said dam but
approximate to but somewhat higher than that
higher than that of the intake section of said up
of the overflow edge of said dam and having a
iiow conduit means; a scum collector exposed to 70 downflow tubular section providing a barometric
the atmosphere for collecting scum discharged
leg leading from said trough into the scum col
thereinto, a scum outflow weir for the collector
lector and terminating therein at elevation lower
for retaining in the scum collector scum and liq
than that of the scum outflow weir thereof.
uid thereof up to the elevation of the scum Weir;
10. Apparatus comprising a closed tank to hold
a scum-receiving hopper within said tank hav 75 an ever-changing body of liquid the surface of
2,406,243
22
which is directly exposed to overlying gases, means
for sucking gas from the upper portion of the tank
for effecting sub-atmospheric pressure on said
gases, means- for submergedly delivering gas
bearing liquidsuspension into said body of liquid,
duit means leading upwardly from the bustle
section and delivering liquid into said chamber;
means providing an effluent overflow dam within
said chamber having an overflow edge at an ele
and over which transfer edge scum floating at
vation substantially higher than that of the lower
end of the marginal wall and slightly lower than
that of the overpass edge; means for conducting
overflowed liquid from said chamber to a locality
outside of the tank and associated therewith
means for minimizing inflow therethrough of
the top of said body must pass before being re
ceived into said trough, means for discharging
within said trough to a locality outside of the
scum from said trough to a locality outside of the
tank and associated therewith means for mini
a scum trough open to the gases in the tank, an
overpass transfer edge for said trough at elevation
lower than that of the top of the tank but higher
than that at which the suspension is delivered
outside air; means for conducting scum from
apparatus, means cooperatively associated with
mizing inflow therethrough of outside air; pump
the latter for minimizing leakage of outside air 15 means for withdrawing gas from within the gas«
thereinto, eliiuent outflow means comprising a
holding spaces of said tank and chamber; and
means for feeding liquid-suspension to the in
bustle section constituted as hereinafter described
for conducting liquid from the interior of the
terior of the tank while minimizing inflow of
tank to a region outside of the apparatus and
outside air for delivering such fed material into
means cooperatively associated with the effluent 20 a region of the tank which is at elevation some
outñow means for minimizing the leakage of out
what lower than that of the elevation of the
overflow edge of said dam but substantially higher
side air thereinto; said tank having an upwardly
extending marginal wall, roof means connected
than that of the lower end of the margin wall of
to said wall, an annular member providing the
the tank.
top of the bustle section the interior edge of which 25
12. Apparatus comprising a closed tank to hold
is connected to said wall at elevation higher than
an everchanging body of liquid the surface of
that of the lower edge of the wall whereby the
which is directly exposed to overlying gases,
lower end portion of the wall provides an inner
means for sucking gas from the upper portion
wall member of the bustle section, an outlying
of the tank for effecting and maintaining a suf
iiciently low subatmospheric pressure on said
ring connected to the outer portion of said an
nular member and extending downwardly there»
gases whereby the surface level of the ever
from providing a peripheral member of said bustle
changing body will be at elevation sufficiently high
section, and a bottom member connected to the
for floating scum to be passed from the body over
lower edge of said ring for completing the lower
limits of the bustle section while providing for
the tank a floor which is vertically spaced below
the lower edge of the marginal wall whereby a
constantly open efiluent passageway is provided
leading into the bustle section, the latter of which
provides the eñiuent intake portion of the afore 40
mentioned eñluent outflow means.
the hereinafter referred to transfer edge into the
trough also hereinafter referred to; means for
submergedly delivering gas-bearing liquid suspen
sion into said body and means associated there
with for minimizing the leakage of air thereinto;
means for conducting effluent from a lower por
tion of the tank to a locality outside of the ap~
paratus and means associated therewith for min
l1. Apparatus of the class described compris
imizing leakage of air thereinto; and scum dis
ing in combination a substantially closed tank
charge means for receiving floating scum from
embodying a ,marginal wall, a roof portion con
the body of liquid within the tank and for de
nected to said marginal wall and providing a gas 45 livering the scum to a locality outside of the
receiving space within the upper interior portion
apparatus and means associated therewith for
of the tank, an annular member providing the
minimizing leakage of air thereinto; said tank
top of a bustle section whose inner edge is con
having an upwardly extending marginal wall,
nected to said marginal wall at an elevation
bottom means connected to the lower portion of
somewhat higher than that of the lower edge of 50 said wall, a frustro~conical roof member of which
the marginal wall, a peripheral member con
the small upper end is open while the outer por
nected to the outer portion of said annular mem
tion of the larger lower end is connected to the
ber and extending downwardly therefrom, a tank
upper portion of the marginal wall, means along
bottom connected to the lower portion of said
the upper end of said roof member for providing
peripheral member but vertically spaced below 55 a transfer edge circular in plan over which passes
the lower end of said marginal wall to provide a
floating scum from within the upper end of said
substantially open passageway between them, and
roof member, and an inverted cup-shaped cap
a scum trough within the tank having an upper
ping member for completing a closure top for the
margin thereof providing an overpass edge at an
tank, said capping member being disposed so that
elevation substantially lower than that of the 60 the top thereof is vertically spaced above said
upper interior of the roof portion but at elevation
transfer edge and has a downwardly extending
substantially higher than that of the lower end
wall portion thereof circular in plan and eccen
of the marginal wall and over which transfer edge
trically disposed with respect to said transfer
edge as well as horizontally spaced about said
scum within the tank must pass before entering
transfer edge and extending downwardly to the
said trough; said bustle section being provided
by said lower portion of the marginal wall, said
frustro-conical roof member to provide with the
annular member, said peripheral member ex
tending downwardly from said annular member
and a portion of said tank bottom; an auxiliary
chamber associated with the tank having a liquid 70
holding section and an overlying gas-receiving
latter a trough of progressively increasing depth
for receiving scum passing said transfer edge,
which said scum discharge means comprises the
thus defined trough and also includes conduit
means extending outwardly from the deep section
space; means providing _constant communica
of the trough.
tion between the overlying gas-receiving space
13. Apparatus comprising a closed tank adapt
of the auxiliary chamber and the gas-receiving - ed to l,hold an ever-changing body of liquid sus
space within the upper portion of the tank; con 75 pension being treated; means for delivering feed
2,406,248
23
liquid into said body; effluent-outflow means in
cluding a dam for controlling the liquid level in
the tank to provide space for a gaseous medium
overlying the liquid body into which the latter is
directly exposed; an auxiliary chamber adapted
lto hold liquid with a space for gaseous medium
overlying and directly contacting liquid therein;
means providing communication between said
spaces; means for sucking gaseous medium from
at least one of said spaces for subjecting gaseous
medium in said spaces to sub-atmospheric pres
sure; said eiiluent-outflow means including a con
duit leading from a region in the liquid-holding
portion of the tank at elevation lower than that
whereat the feed liquid is delivered into ever
side air into the feed means and thence into
the tank; upñow-conduit means leading from
a low region of the liquid-holding portion of
the tank to the liquid-holding portion of said
auxiliary chamber, which said lower region is
at elevation lower than that at which the feed
material is delivered >into the main tank;
eiïiuent-overi‘low dam means within said auxil
iary chamber over which effluent passing in
transity through the auxiliary chamber must
overflow whereby the normalminimum level of
the liquid body within said tank is maintained
substantially up to an overflow elevation of said
eñìuent-over?low
dam
means; _ tubular
means
for passing overflowed liquid from the auxiliary
changing body and extending upwardly to the
chamber to the exterior thereof; means asso
ciated with said tubular ymeans for minimizing
leakage of outside air into the tubular means
and thence into the auxiliary chamber; means
taining a quantity of eiiluent as a sealing medium 20 providing a passageway between the liquid
and an overflowed eflluent conduit extending
holding portion of the tank and the liquid-hold
downwardly from the chamber and dipping into
ing portion of the secondary chamber whereby
the sealing medium serving as a barometric leg;
the tank and the secondary chamber are in
auxiliary chamber thereby providing means for
holding a column of upflowing eiiluent enroute
to the auxiliary chamber, eñiuent receiver for re
said tank having an upwardly extending mar
ginal wall, a bottom member connected to the
'lower portion of said wall, a frustro-conical roof
member of which the smaller upper end is open
providing a throat portion while the outer por
tion of the larger lower end is connected to the
upper portion of the marginal wall, means along
the upper end of said roof member embodying a
vertically operable throat adjusting member pro
constant hydraulic communication; pumping
means for sucking gas from said gas-holding
spaces for thereby maintaining the gas therein
at pressure substantially sub-atmospheric, said
pumping means comprising intake suction pip
ing having suction nozzle means providing an
intake tip operatively disposed within the sec
ondary chamber and positioned for receiving
liquid preparatory to passing liquid through
viding a transfer edge over which there passes
the nozzle means when the level of the liquid
within the secondary chamber rises to exceed
an inverted cup-shaped capping member for com
the elevation of said suction nozzle means
pleting the.closure top of the tank so disposed
whereby said pumping means functions to re
that the top thereof is vertically spaced above
move by suction liquid entering said nozzle
said transfer edge and having wall portion sur
means; a scum trough within the tank having
rounding but horizontally spaced from said trans
an over-pass edge at elevation approximatelyV
fer edge while extending downwardly to the frus 40 that of the overflow elevation on said dam and
tro-conical roof member to provide with the lat
over which edge scum floating within the tank
ter a trough for receiving scum passing said
must pass into the trough preparatory to de
transfer edge; a scum collector for holding seal
livery therefrom to a region outside of thetank;
floating scum from within the throat portion,
ing liquid therein; and conduit means leading
scum-discharge means for passing such trans
from the trough and serving as a barometric leg 45 ferred scum from the trough to the exterior
extending into the liquid within said collector.
of the tank; and means associated with the
la. Apparatus according to claim 13, having
means connected to said throat-adjusting mem
scum-discharge means for minimizing leakage
of outside air into the tank.
ber and extending into the atmosphere outside of
16. Apparatus comprising l a closed tank
said apparatus for vertically positioning said 50 wherein there is normally maintained an ever
throat member.
>
changing body of liquid directly exposed, to an
l5. An apparatus for performing a continu
overlying gaseous medium; pumping means for
ous process for separating and removing float
sucking gaseous medium from the apparatus
able matter as scum from a liquid suspension,
for `maintaining gaseous medium remaining in
which comprises in operative combination a
the apparatus at sub-atmospheric pressure;
closed. tank providing therein a lower liquid
feed supply means having a discharge section
holding portion wherein there is established a
delivering gas-bearing liquid suspension con
body of such suspension and also providing
taining ñoatable matter into the tank at >an
therein an upper gas-holding space in which
elevation intermediate the top and bottom of
the gas directly overlies said body; a closed auxil 60 the tank and means for minimizing air leakage
iary chamber; a closed secondary chamber; Vsaid
into said feed supply means; a trough open to
auxiliary chamber providing a lower-liquid-re
the gaseous medium within the tank, an over»
ceiving portion for liquid passed thereinto from
pass edge for the trough at elevation higher
a column of upñowing eiiiuent and an upper
than said feed discharge elevation but lower
gas-holding space wherein gas directly overlies
than the the top of the tank over which over
liquid within the lower portion thereof; said
pass edge fioating material from the said body
secondary chamber providing a lower liquid
passes before being received in said trough; dis
holding portion and an overlying gas-holding
charge means for passing floating material
space; gas-communicating means between the
from said trough to outside the apparatus and
gas-holding spaces of said tank and chambers 0 means for minimizing air leakage into said dis
whereby the pressure of the gas therein is equal
charge means; and ef?luent-outñow means'lead
ized; feeding means for delivering as feed ma
terial the liquid suspension to be treated in
said main tank; means associated with said
feeding means for minimizing leakage of Vout
ign from the interior portion of the tank at ele
vation lower than said feed discharge elevation
to outside the apparatus and means for mini
75 mizing air leakage into said effluent-outflow
2,406,248
25
26
means; said apparatus being characterized in
that there is a pumping meanschaving a gas
suction line connected to and in communication
the liquid within the tank at elevation lower than
that of the over-pass edge of the trough.
19. Apparatus comprising a closed tank where
in there is normally maintained an ever-changing
with the interior of the upper gaseous medium
holding portion of the apparatus, and a dis
charge line embodying a gas-distributing mem
ber having discharge orifices for delivering
pumped gaseous medium as jets directed to im
pel the floating material over said GVeT-p aSS `
edge.`
body of liquid directly exposed to overlying gas;
pumping means for sucking gas from the appa
ratus for maintaining gas remaining in the tank
at sub-atmospheric pressure; a trough open to the
gas within the tank, an over-pass edge for the
10 trough at elevation intermediate that of the top '
17. Apparatus comprising a closed tank
wherein there is normally maintained an ever
changing body of liquid directly exposed to
overlying gas conñned within the upper interior
portion of the apparatus; pumping means for
sucking gas from withinthe upper portion of
the apparatus for maintaing gas remaining>
therein at sub-atmospheric pressure; feed-I
supply means having a discharge section de
livering
gas-bearing liquid suspension
con
taining iloatable matter into the tank at an
and bottom of the tank and over which edge
floating material on said body must'pass before
receipt in said trough; discharge means for p-ass
ing floating material from said trough to outside
the» apparatus and means for minimizing air
leakage into said discharge means; feed-supply
means having a discharge Vterminal for deliver
gas-bearing liquid suspension into the tank
at an elevation lower than that of said edge and
having means .for minimizing air leakage into
said feed-supply means; and effluent-outflow.
elevation intermediate the top and bottom of
means leading from an interior portion of the
the tank and means for minimizing air leakage
tank lower than that of said edge to outside the
into said feed supply means; a trough open to
apparatus and having means for minimizing air
the subatmospheric gas within the apparatus, 25 leakage into said eii‘luent-outflow means; said ap
an over-pass for the trough edge at elevation
paratus being characterized in that there is
higher than said feed dischargeelevation but
pumping means having a suction line leading
thereto from an upper interior region of the ap
lower than the top ofthe tank and over which
paratus for sucking sub-atmospheric pressure
edge floating material on said body must pass
before being received in said trough; discharge 30 gas, and a discharge line for delivering said gas
means for transferring floating material from
thus pumped into the tank at elevation lower than
said trough to outside the apparatus and means
that of said discharge terminal.
for minimizing air leakage into said discharge
2€). Apparatus comprising a closed tank where
means; an efiiuent-outñow means leading from
in there is normally maintained an ever-changing
an elevation within the tank lower than that 35 body or liquid directly exposed to an overlying
of said edge to outside the apparatus and means
gas; pumping means for sucking gas from the
for minimizing air leakage into said eiiluent
'apparatus for maintaining gas remaining in the
tank at sub-atmospheric pressure; feed-supply
outflow means; said apparatus being character
ized in that it includes pumping means having
means having a discharge terminal for delivering
a gas suction line for conducting sucked gas 4.6 gas-bearing liquid suspension into the tank at ele
from the upper interior portion of the appa-`
vation between the top and bottom of the tank
ratus, and a discharge line having a terminal
and means for minimizing air leakage into said
portion providing discharge openings located
feed supply means; a trough open to the gas with
at elevation lower 'than that of the over-pass
in the tank, an over-pass edge for the trough at
edge of the trough and delivering the pumped
gas upwardly and outwardly into ñoating ma
terial within the tank for impelling the floating
.» elevation below that of the top of the tank but
higher than that of said discharge terminal and
over which edge ñoating material on said bodyy
material over the over-pass'edge.
18. Apparatus comprising a closed tank where
in there is normally maintained an ever-changing 5?
means for passing floating material from said
trough to outside the apparatus and means for
body of liquid directly exposed to an overlying
minimizing air leakage into said discharge means;
gas; pumping means for sucking gas from the ap
paratus for maintaining gas remaining in the
tank at sub-atmospheric pressure; a tro-ugh open
and eiiiuent-outilow means leading from an inte
rior portion of the tank lower than that of said
edge to outside the apparatus and means for
must pass before receipt in said trough; discharge
minimizing air leakage into said eiîiuent-outñow
means; said apparatus being characterized in that
the trough
elevation intermediate that of the
there is pumping means having a suction line
top and bottom of the tank and over which edge
leading from an interior portion of the apparatus
ñoating material on said body must pass before
receipt in said trough; discharge means for pass
below said feed discharge terminal for conveying
ing iloating material from said trough to outside 60 sucked ñuid therethrough, and a discharge line
the apparatus and means for minimizing air leak
_ for delivering the thus sucked and pumped fluid
age into said discharge means; feed-supply means
Within the tank at elevation lower than that of
said discharge terminal.
i
having a discharge section for delivering gas
2l. Apparatus comprising a closed tank where
bearing liquid suspension into the tank at an ele
vation lower than that of said edge and having 65 in there is normally maintained an ever-changing
body of liquid directly exposed to an overlying
means for minimizing air leakage thereinto; and
effluent-outflow means leading yfrom an interior
gaseous medium; pumping means for sucking
gaseous medium from the apparatus for main
portion of the tank but lower than that of said
edge to outside the apparatus and having means
taining gaseous medium remaining in the tank
for minimizing air leakage thereinto; said apila 70 at sub-atmospheric pressure; feed-supply means
ratus being characterized in that it has pumping
having a discharge section submergedly deliver
to the gas within the tank. an over-pass edge for "
means having a suction line leading from an up
per interior region of the apparatus for sucking
ing gas-bearing liquid suspension containing
floatable matter into the tank at feed discharge
elevation intermediate the top and bottom of the
discharge line for delivering gas thus pumped into 75 tank and means for minimizing air leakage into
sub-atmospheric pressure gas therefrom, and a
2,406,248
27
28
overlying gaseous medium;'a receiving trough,
said feed-supply means; a trough open to the
gaseous medium within the tank, an over-pass
edge for the trough at elevation higher than said
an over-pass edge for' the trough over which
iloating material'from the body of liquid underu
going treatment must pass- preparatory to being
feed discharge elevation but lower than‘the top
of the tank over which edge floating material on
said body must pass before receiptI in said trough;
received into the trough and whose elevation is
lower than said feed discharge elevation to out
tube having an intake end submerged within the
side the apparatus and means for minimizing air
leakage into said effluent-outflow means; said ap
paratus being characterized in that it includes a
pump having a suction line in and constituting
part of liquid transfer means leading from a liq
liquid within said basinarid> a terminal discharge
substantially higher than that ¿of the bottom of
discharge means for passing floating material
said tanky but substantially lower than that >of
from said trough to outside the apparatus and
the uppermost interior portion of the top of the
means >for minimizing air leakage into said dis
tank; a'basin outside of said tank for holding.
charge means; effluent-outflow means leading 10 under atmospheric _pressure conditions feedliq
from the interior portion of the tank at elevation
uid containingsolids'suspended therein; a‘draft
within but located above the bottom of the tank
at elevation lower than thatl of said over-pass>
edge; an effluent receiver provided outside> of the
tank for holding therein a maintained bodyV of
uid-holding portion of the tank functionally dis
posed below the deliveryv of said feed-supply
eliiuent serving as sealing liquid; eiiluent-out?low
means comprising a> closed compartment; an
means, and a discharge line leading from the 20 efiiuent-overilow daniY functionally> dividing the
pump for directively delivering pumped liquid
compartment into an upiiowfeifiuent Areceiving
into said feed-supply means for furthering the
portion and an overiiowed-eiiluent receiving por-v
forward passage of feed material upwardly from
tion,`conduit _means leading upwardly from Va
the same.
lower interior portion of the tank tosaid com
'
22. Apparatus of the class described comprising
partment, and conduit means providingA a baro
a closedrtank wherein there is normally main
tained an ever-changing body of liquid directly
exposed to overlying gaseous medium; pumping
metric leg leading downwardly Yfrom the over
?lowedLeiilu'ent receiving portion of the compart
ment into the eiliuent receiver so that the dis
charge end thereof Vis constantly submerged in
means for sucking gaseous medium from the up»
per interior Vportion of the tank for maintaining so ï the effluent within said receiver, `said eñluent dam.
gaseous medium remaining in the tank atïores
having an' overñow elevation lower than that of
sures sub-atmospheric; feed-supply means hav
the uppermost interior'portion of thev compart
ing a tubular section affording an upñow deliv
ment but proximate that of the over-pass edge
ery portion disposed for submergedly delivering , for the trough; a collectorlocated outside of the
gas-bearing liquid suspensions containing float~ 35 Atank for holding therein a _maintained bodyof
able matter into the tank at a feed discharge ele
sealing liquid; conduit means providing abarc
vation intermediate the topand bottom of the
metric leg .extending downwardly >from said
tank and means forl minimizing air-leakage into
trough and into said collector so that thevdis
said feed-supply means; a trough open tothe
gaseous medium within the tank, an over-pass
edge for the trough at elevation higher than said
feed-discharge elevation but lower than that of
the top of the tank and over which transfer edge
floating material on said body of liquid must pass
t, charge end thereof is constantly submerged in the
liquid within said collectorgmeans providing con
stant gas communication between the upper in»
terior portion of the tank and the upper interior
portion ofY the compartment; gas pumping> means
for removing gaseous medium from the upperinu
before being received in said trough; transfer
means for passing floating material from said
trough to outside the apparatus and means for
minimizing air leakage into said transfer means;
and effluent-discharge means leading from the
interior portion of the tank at elevation lower 50
terior portions of the tankY and compartment and
for vdischarging gaseous medium pumped thereby
than said feed discharge elevation to outside the
apparatus and means for minimizing air leakage
into said effluent-discharge means; said appa
ratus being characterized in that it includes
passageway leading from the second pump dis
pumping means for withdrawing sub-atmospheric
process for separating and removing suspended
to a locality outside of the tank, and
second
pumping means providing` a suction passageway
leading Yto the second pump from the eíiiuentM
outflow means, and means providing a discharge
posed for delivering pumped fluid into a liquid
holding portion of the tank.
Y
Y
' 24.> An apparatus for performing a continuous
pressure gaseous medium from within a gas-hold
matter from a liquid suspension, which apparatus
ing space of said tank, a discharge conduit lead
comprises a closed tank providing within the
ing from said pumping means, and a distributing
upper interior portion thereof a section for hold
head in which said discharge conduit terminates,
ing a gaseous medium at subatinospheric pres-v
which head is arranged in association with .a 60 sure and providing within a lower interior por
portion of said tubular feed section and has dis
tion thereof a section for holding an ever-chang
charge openings for delivering pumped gaseous ' ing body of such liquid undergoing treatment that
medium into the tubular section for assisting the
is constantly exposed to said overlying lgaseous
flow of feed material forwardly within the tubu
medium; a trough, an over-pass edge for the
lar section.V
65 trough over which floating material from the
2'3. Apparatus for performing a continuous
body of liquid undergoing treatment must pass
process for separating and removing suspended
preparatory to being received in the trough Whose
matter from a liquid-solids suspension, which ap
elevation is substantially higher than that of
paratus comprises a closed tank providing within
the bottom of the tank but substantially lower
the upper interior portion thereof a sectionfor 70 than that of the uppermost interior portion of
holding a gaseous medium at sub-atmospheric
the top of the tank; a basin outside of said tank
pressure and providing within the underlying in
for holding under atmospheric pressure feed liq
terior portion thereof a section for holding an
uid containing solids suspended therein; a draft
ever-changing body of such liquid undergoing
tube having a lower intake end submerged with
treatment thatV is constantly exposed to said 75 in the liquid in said basin and an upper discharge
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