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Патент USA US2407949

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Sept. 17, 1946.
A- BUTCHER
2,407,947
APPARATUS FOR THE CLARIFICATION OF LIQUIDS
Filed June 19) 1945
14
12
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15 16
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ALFRED BUCEGHER
'
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‘Wu;
Patented Sept. 17, 1946
2,407,947
UNITED‘ smrrzsv PATENT or FICE
2,407,947
‘
APPARATUS FOR THE CLARIFICATION OF
LIQUIDS
Alfred Butcher, Pittsburgh, Pa., assignor to Gulf
Oil Corporation, Pittsburgh, Pa., a corporation
of Pennsylvania
Application June 19, 1945, Serial No. 600,274
.
8 Claims.
1
This invention relates to apparatus for the
clari?cation of liquids, particularly where a coag
ulant is used as in the clari?cation of water, and
has a main object to provide a relatively simple
and easily constructed system whereby ?oc for
mation and removal are effectively accomplished
and a well-clari?ed effluent is secured. In the
accompanying drawing I have shown the new
apparatus in practical embodiment, by way of
(01. 210-16)
I 2
upper edge of the ba?ie 20 is on the level of the
upper end of the portion 6 of the downcomer.
Reference numeral 2| designates a circular
pipe disposed around the downcomer and con
centrically therewith in the corner which exists
between baffle 20 and the tank bottom. The pipe
is provided with a multiplicity ‘of openings 22
and a draw-off pipe 23 in connection with pipe
2! is led through the ba?‘le 20 and side wall 3 to
example, the drawing being a vertical axial 10 suitable suction means, the pipe 23 being sealed
section.
in openings in the ba?ie and side wall.
Referring thereto, reference number I desig
Concentrically disposed with respect to bal?e
nates generally a metal tank having a circular
26 is a similar conical frustum 24 which extends .
bottom wall 2 and a cylindrical side wall 3. Ref
from the top of the tank down to a level here
erence numeral 4 designates a downcomer in the 15 shown as about midway of the height of ba?ie 20.
form of a vertical tubular column disposed cen
Ba?le 24 is supported by means of suitable frames
trally of the tank and having a, cylindrical upper
as at 25 and by struts as at 25 extending between
portion 5 and a flared lower portion comprising
the two baffles. A circular pipe 21 concentric
conical frusta 6 and ‘I of which the former is
with the tank bottom is disposed in the corner
substantially steeper than the latter. Portion ‘I 20 between the side and bottom walls of the main
terminates downwardly in a lower horizontal
tank and is in connection With a draw-off pipe
edge 8 spaced above the tank bottom and the area
28 which is led ‘through the side wall 3 and
de?ned by this edge is many times greater than
the cross-sectional area of the top portion 5.
sealed therein.
Near its upper end, the latter is provided with an
inlet 9 for the liquid to be treated, here assumed
to be water, an inlet 10 for the coagulant being
provided below the inlet 9. The upper end of the
Supported by horizontal top members as at 30
of frames 25 and by brackets as at 3i secured to
the side wall 3, is an annular formation compris
downcomer is open. The downcomer is support
ed by means of short pedestals as at H ?xed to
the tank bottom and to the lower portion 1. The
latter includes an inspection door ‘Ia.
As here shown, an electric motor I2 is mounted
on any suitable framework I 3 above the tank and
drives into a speed reducer Id which has a verti
Pipe 21 is provided with perfo
rations 29.
ing a side wall‘ 32 and a bottom wall
‘
the lat
ter being welded throughout to the inside of
peripheral wall 3 so that a water withdrawal
trough 34 is de?ned, the (upper over?ow edge 35
of the trough being at a level below the top of
baifle 24 but above the top of ba?‘le 20.
In the use of the apparatus the spreader or
agitator constituted by the blades I9 is set in
motion, turbid water is admitted at 9, and a coag
ulant of suitable character is injected at I0. As
cal output shaft connected through a coupling I5
with a vertical shaft I5 disposed centrally of the
downcomer with its lower end stepped in a pillow
the water and added coagulant move downward
.block I1 ?xed on the tank bottom. Shaft I6 is
ly, their velocity is decreased due to the increas
made in two parts joined by a frangible coupling
ing areas provided by the ?ared lower portion of
I 8 and the lower section of the shaft carries a
the downcomer. The stirring mechanism pre
hub portion equipped with blades as at I9 pref
vents the sludge from accumulating under the
erably arranged tangentially to a circle concen
downcomer, pushing it out into the space defined
tric with’ the shaft with the blades in trailing
by the baffle 20. The stirrer also acts as a ?oc
relation when the shaft is normally driven. The 45 former since it accelerates the mutual adsorption
blades I9 sweep over that portionof the tank
of the sludge particles.
bottom beneath the downcomer with an outward
Ba?ie 20 enforces upward movement of the en
propelling effect through the annular opening
tire ‘outflow from the downcomer. Within ba?le
existing between the edge 8 and the tank bottom.
2% the floc tends to roll slowly toward the baffle,
Arranged concentrically with the downcomer
with its lower edge welded to the tank bottom is
an annular ba?le 20 having the form of a frustum
of a cone, the baffle together withthe included
then upwardly, then over toward the axis, and
then down, cascading on the ?ared portion of the
downcomer and joining the newly made ?oc
which is emerging from beneath the downcomer.
portion of the bottom 2 de?ning in effect a tank
At the same time the action of the stirrer tends
within the main tank I. As here shown, the 55 to turn the entire body of water ‘and ?oc within
2,407,947
4
3
ing above and below the upper edge of the ?rst
.ba?le and above the upper edge of said trough and
terminating downwardly a distance above the
travel.
'
tank bottom, and a perforated annular sludge
The flow over the top of baffle 20 should nor
mally be substantially clear, but in order to block Ci withdrawal conduit in the tank adjacent the
lower portion of said peripheral wall.
direct access to the collecting trough 34, baffle
3. A liquid clari?er comprising a. tank having
24 enforces a- downward flow so that a secondary
a bottom and a-peripheral wall, a downcomer for
precipitation can effectively occur. The clear
the liquid to be treated, disposed substantially
water rises outside of baffle 24 to flow over the
centrally of the tank and terminating in a lower
edge 35 into the trough 34 whence it is with
edge spaced above the tank bottom, a rotatable
drawn through a ?tting 3t which extends,
vertical shaft mounted centrally of said down
through the wall 3. The path of flow is indi
c'omer, means for rotating said shaft, agitator
cated by the succession of arrows 31.
blades carriedby saidshaft and adapted to sweep
As the fine forms and gathers in‘, the corners
1 over thetan-k'bottom with a horizontal propelling
of the inner and outer tanks, it is removed by the
effect, an annular ba?le surrounding the lower
rings ill and 21.
portion of the downcomer and adapted to direct
It will be evident that after the water leaves
upwardly the out?ow from beneath said lower
the lower end of the upper section 5 of the down
edge, anannular liquid withdrawal trough in said
comer the speed of flow becomes progressively:
slower due to the progressively increasing areas 20 tank surrounding said ba?le, a perforated annular
sludge withdrawal conduit within said ba?le ad
and ?oc formation and deposition are promoted
jacent the lower portion thereof toward which;
by therba?les, particularly the inner one. The
said agitator blades sweep precipitated sludge;
precipitate is localized at the rings so as to be
a second annular baf?e disposed between said,
readily withdrawn with minimum water loss.
Without the baffle, arrangement, the i100 parti 25 trough and, ?rst baffle, said second baffle extend,
ing above and below the upper edge of the ?rst
cles would be ?nely scattered over the tank bot
baffle and terminating downwardly a distance
tom and‘ the withdrawal-of sludge would be very
above the tank bottom, and a perforamd annular
inefficient, resulting in a high percentage of lost
sludge withdrawal conduit in the tank adjacent
waten
What I claim is:
>
.
30, the lower portion of said peripheral wall, the
the inner tank so that the floc particles have also
a spiral motion, giving an extended distance of
1. A liquid clari?er. comprising av tank having
upper edge of said trough being above the upper
a bottom and a peripheral wall, a downoomer for
edge of the ?rst ba?le and the upper edge of the
the, liquid to be treated, disposed substantially
centrally of the tank and terminating in a lower
‘, edge spaced above the tank bottom, a rotatable
vertical‘ shaft mounted centrally of said down
second ba?ie being‘ above the upper edge‘ of said.
trough so that flow overtheto-p of the ?rst ba?le
_ must all pass beneath the second ba?ie'in, order;
to reach the trough.
,
'
bladescarried by said shaft and adapted to sweep
‘l, A liquid clari?er comprising a tank having a
bottom and a peripheral wall, a downcomer‘ for
portion, of said. peripheral wall.
second annular baf?e in the form of atruncated' '
comer, means for rotating said shaft, agitator I
the liquid to be treated, disposed substantially,
over the tank bottom with a horizontal propelling
effect, an annular baffle‘ surrounding the lower 40 centrally of the tank and terminating in a lower
edge spaced above the tank bottom, a rotatable
portion of the downco-mer and adaptedto direct
vertical shaft mounted centrally of said down
upwardly the outflow from beneath said lower
comer, means for rotating said shaft, agitator
edge, an annular liquid withdrawal trough in said
blades carried by said shaft and adapted to
tank surrounding said baffle, a perforated annular
sweep over. the tank bottom with a horizontal
sludge withdrawal conduit within said baffle adja
propelling effect, an annular ba?le in the form
cent the lower ponticn thereof toward which said
of a truncated cone surrounding, the lower por- '
agitator blades sweep precipitated sludge, a sec
tion of said downcomer and adapted to direct
and. annular baffle disposed between said trough
upwardly the outflow from said lower endhan,
and ?rst. baffle, said second baffle extending above
annular liquid withdrawal trough in said, tank
and below. the upper edge of the first ba?le and
surrounding said ba?le, a perforated. armulara
above the upper edge of said trough and termi
sludge withdrawal‘ conduit within said; bali'le- adi
nating downwardly a distance above‘ the tank
jacent the lower portion thereof toward which
bottom, and a perforated annular sludge with
said agitator blades sweep precipitated sludge, a,
drawal conduit in the tank adjacent the lower
.
2. A liquid clari?er comprising a tank having
abottom and a peripheral wall, a'downcomer for
the liquid to be treated, disposed substantially
centrally of the‘tank and terminating in a lower
edge spaced above the tank bottom, a rotatable
' vertical shaft mounted centrally of said down
comer, means for rotating said shaft, agitator
blades carried by said shaft and adapted to sweep
over the tank bottom with a horizontal propelling
effect, an annular ball‘le in the form ofv a trun
cated cone surrounding the lower portion, of said
downcomer and adapted to direct upwardly the
out?ow from said lower end, an annular liquid
withdrawal trough in said tank surrounding said
ba?le, a, perforated annular sludge withdrawal
conduit withinsaid baffle adjacent the lower por
tion thereof toward which said agitator blades
cone between, said ‘trough and, ?rst baffle, said
second balue extending above and, below the
upper edge of the ?rst baffle and terminating,
downwardly distance above- the tank bottom,
and a perforated annularsludgewithdrawal con~
duit in the tank adjacent the lower portion of
saidperipheral wall, the, upper edge of saidtrough;
being above the upper edge of the first baffle and
the upper edge of the second baffle being above,
the upper edge of said trough sothat however,
the top, of the ?rst ba?le must. all'pass beneath
theisecondba?le in order to‘ reach the trough.
5. A liquid clari?erv comprising atank having, a.
bottom and a peripheral wall, a hollow'verti‘cal'
column disposed substantially centrally‘ of? the
tank and having a symmetrical‘- downwardly.
?aring lower- end terminating’ in an edge-spaced.
above the tank bottom; said column. constituting
sweep precipitated sludge, a second annular baffle
in the form, of. a truncated cone between said
a downcomer for the liquid to, be treated, a,ro.-.
trough and ?rst,ba?lel,,said second baf?e extend
.1 tatablel vertical shaft. mounted centrally of said;
5
2,407,947
6
column, means for rotating said shaft, blades
carried by said shaft and adapted to sweep over
carried by said shaft and adapted to sweep over
the tank bottom with a propelling effect out
the tank bottom with a propelling effect out
wardly of said lower end, an annular ba?ie sur
wardly of said lower end, an annular ba?le sur
rounding the lower portion of said downcomer
rounding the lower portion of said downcomer 5 and adapted to direct upwardly the outflow from
and adapted to direct upwardly the outflow from
said lower end, an annular liquid withdrawal
said lower end, an annular liquid withdrawal
trough in said tank surrounding said ba?ie, and a
trough in said tank surrounding said battle, and a
perforated annular sludge withdrawal conduit
perforated annular sludge withdrawal conduit
within said ba?le adjacent the lower portion
within said baffle adjacent the lower portion
thereof toward which said blades sweep precipi
thereof toward which said blades sweep precipi
tated sludge, a second annular ba?le disposed be
tated sludge, a second annular ba?‘le disposed be
tween said trough and ?rst baiiie, said second
tween said trough and ?rst ba?le, said second
baffle extending above and below the upper edge
baffle extending above and below the upper edge
of the ?rst ba?le and terminating downwardly
of the ?rst baflle and above the upper edge of
a distance above the tank bottom, and a perfo
said withdrawal trough and terminating down
rated annular sludge withdrawal conduit in the
wardly a distance above the tank bottom, and a
tank adjacent the lower portion of said periph
perforated annular sludge withdrawal conduit
eral wall, the upper edge of said trough being
in the tank adjacent the lower portion of said
above the upper edge of the ?rst baffle and the
peripheral wall.
20 upper edge of the second baffle being above the
6. A liquid clari?er comprising a tank having a
bottom and a peripheral wall, a hollow vertical
upper edge of said trough so that ?ow over the
top of the ?rst ba?le must all pass beneath the
column disposed substantially centrally of the
second ba?le in order to reach the trough.
tank and having a symmetrical downwardly
8. A liquid clari?er comprising a tank having a
?aring lower end terminating in an edge spaced 25 bottom and a peripheral wall, a hollow vertical
above the tank bottom, said column constituting
a downcorner for the liquid to be treated, a rotat
column disposed substantially centrally of the
tank and having a symmetrical downwardly
able vertical shaft mounted centrally of said col
?aring lower end terminating in an edge spaced
umn, means for rotating said shaft, blades car
above the tank bottom, said column constituting
ried by said shaft and adapted to sweep over the 30 a downcorner for the liquid to be treated, a rotat
tank bottom with a propelling effect outwardly of
able vertical shaft mounted centrally of said 001-’
said lower end, an annular ba?le in the form of
umn, means for rotating said shaft, blades car
a truncated cone surrounding the lower portion
ried by said shaft and adapted to sweep over the
of said downcomer and adapted to direct up
tank bottom with a propelling effect outwardly
wardly the out?ow from said lower end, an annu 35 of said lower end, an annular baffle in the form
lar liquid withdrawal trough in said tank sur
of a, truncated cone surrounding the lower por
rounding said ba?le, a perforated annular sludge
tion of said downcomer and adapted to direct
withdrawal conduit within said baffle adjacent
upwardly the outflow from said lower end, an
the lower portion thereof toward which said
annular liquid withdrawal trough in said tank
blades sweep precipitated sludge, a second annu 40 surrounding said battle, a perforated annular
lar ba?le in the form of a truncated cone between
sludge Withdrawal conduit within said baille ad
said trough and ?rst baflle, said second baffle ex
jacent the lower portion thereof toward which
tending above and below the upper edge of the
said blades sweep precipitated sludge, a second
?rst ba?le and above the upper edge of said with
annular ba?le in the form of a truncated cone
drawal trough and terminating downwardly a 45 between said trough and ?rst ba?ie, said second
distance above the tank bottom, and a perforated
ba?le extending above and below the upper edge
annular sludge withdrawal conduit in the tank
of the ?rst baiile and terminating downwardly a
adjacent the lower portion of said peripheral
distance above the tank bottom, and a perfo
wall.
rated annular sludge withdrawal conduit in the
7. A liquid clari?er comprising a tank having a 50 tank adjacent the lower portion of said periph
bottom and a peripheral wall, a, hollow vertical
eral wall, the upper edge of said trough being
column disposed substantially centrally of the
above the upper edge of the ?rst ba?le and the
tank and having a symmetrical downwardly
upper edge of the second baffle being above the
?aring lower end terminating in an edge spaced
upper edge of said trough so that ?ow over the
above the tank bottom, said column constituting 55 top of the ?rst ba?‘le must all pass beneath the
a downcomer for the liquid to be treated, a ro
second baffle in order to reach the trough.
tatable vertical shaft mounted centrally of said
column, means for rotating said shaft, blades
ALFRED BUTCHER.
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