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Патент USA US2403695

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July 9, 1946.
J. DJWALKER
2,403,695
APPARATUS ‘FOR TREATING SEWAGE
Filed Dec. 4, 1941
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July 9, 1946.
~J. D. WALKER
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_ 2,403,695 '
‘ APPARATUS FOR TREATING SEWAGE '
Filed Dec. 4, 1941
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July 9,
I
J_ D_ WALKER
'
APPARATUS FOR TREATING SEWAGE
Filed: Dec. 4, 1941
I ‘
' 5 Sheets-Sheet s
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INVENTOK
' 2,403,695
Patented July 9, 1946
UNITED STATES PATENT critics-.11
APPARATUS FOR TREATINGLSEWAGE
to The
James‘ D. Walker, Aurora, 111., assignor
American Well. Works, Aurora, 111., a. corpora.-~
tion of Illinois.
Applicationpecember 4, 1941,, SerialNo. 472L531"
".9 Claims. (or 210-4)
?‘ooding'period, and hence there is nooverloading
of subsequent apparatus nor appreciable polluting
Trickling ?lters io-rfse'wag'e have longbeen rec- ;
ognized as having some advantages overithe acti
of; a' stream.
_. vated'sludge treatment‘ and; have recently been
recognized asextremeiy desirable for ‘use in ad
van'ce'of activated sludge treatment. However, '
there has been one very great objection to trick- '
ling ?lters, namelythat they formed‘ a breeding
place. for the very obnoxious ?lter ?y. These
?lter ?les are believed to be more properly iden
ti?ed as Psychoda alternatcr, but regardless of
As a matter of ‘ fact, even during
the treatment period the- sewage probably'receives'
170
their identityrthey' have been proli?c enough to
some partial treatment as it is ?ushed‘ through
the ?lter bed, although this may not’ be atJall
necessary in view of the short period of,‘ ?ushing.
Additional" objects and advantagesof the in.
vention will be apparent: from the following-de
scription and from the drawings, in which:
Fig. 1 is a vertical sectional View of a trickling
constitute a severe nuisance not only to the oper
?lter unit, showing diagrammatically the. ‘?uid
supply and recirculating means provided in ac;
ators but to the whole. neighborhood, and perhaps
cordance with this invention-
-
'
Fig. 2 is a View on a larger scale of one-arm. of
15
Various attempts have been inade to combat - the rotary distributor, showing the‘ spacing. of the
a health menace aswell.
the iilter ?ies, one of the most’ common being to
normal‘ distributing ori?ces and of: the auxiliary
shut o? the ?lter drain so as to. ?ood the, ?lter.
?ushing ori?ces.
'
.
Aside from the fact thatrit didn’t do the job any
Fig. 3‘ is- an enlarged detail view of the outer
way, this was very objectionable because it com 20 end of the rotating distributor arm-J
pletely prevented the. proper action of the ?lter
Fig. 4- is an end view of the structure shown in
inasmuch as theuseful bacteriain the?lter re
Fig. 3.
.
I quire the presenceof
air,_ Furthermore, after
?ooding the ?lter it- could only ice-restored to use
fulness by releasing its entire contents of: un
treated and possibly septic sewage, This would
be likely to overload any subsequent treating‘ ap
paratus,;or if it were’ deposited directly into a
Fig. 5 is a vertical sectional view showingpar- ‘
ticularly the means for controlling the rotation
of the rotary distributor.
‘
,
Fig. 6 is a transverse vertical sectional-v view
through one arm of the rotary distributor, taken
approximately onthe 1ine':6-—6.:0f Figi5‘, at the
stream would seriously pollute the stream.
position of an auxiliary ori?ce;
" I
Although the, ?ooding may have alleviated the 30 Fig. '7 is a face view of the gate valve shown in’
vdiiiiculty by temporarily closing off the breeding 'Fig. 6. ‘
ground,.it never did a thorough lob, of ending the
Fig. 8 is a view corresponding to Fig. 6 but taken
approximately‘ on the line c-a of Fig. 5. at the
?lter ?y evil. Applicant has determined that this
is because the ?lter ?y larva~ will, not drown and
position of a normally open- ori?ce, _
many of. them remain'in the ?lter after ?ooding
Fig. 9 is a fragmentary vertical sectional. view
and‘ draining so that. more ?lter ?ies begin to 35 showing‘ a modi?ed form of rotary. seal which»
appear as soon, as the '?ltelr is restored‘ to opera
maybe used with this invention.
Fig. 10 is a plan view of the ?lter unit in which
ti-on,
.
-
,
_.
>
V
y
.
'
According to the present invention, the ?lter
?y evil is substantially eliminated by ?ushing all
» of the. larvae out. through the ?lter bed. Instead
of attempting. in vain to ‘drown the ?ies and
larvaethey are. washed out, being disposed of'with
the rest of,‘ the, sewage.v Applicanhiurthermore,
this invention may be incorporated.
40
A preferred form of the invention (‘with an
alternative seal) has been-chosen for illustration
and description, in compliance with Section 4888,,‘
of the Revised’ Statutes, but persons skilled’ in- the
art will readily perceive other means embodying
has developed a highly practical apparatus for 45 one or more inventive concepts herein disclosed
?ushing outthe larvae- By ?ushing out the
for accomplishing the same results, and it- is ap
larvae at intervals?shorter-than the non-?ying
plicant’s desire that these as well as the .form
period of the, life of the ?lter ?y,_ it will be ap-'
parent that substantially the only ?lter ?ies
present will be.‘ those which are drawn to the ?lter‘
chosen for illustration be‘covered by the patent.
Fig. 1 illustrates the general combination-com
prising this invention, the trickling ?lter includ
from elsewhere._
.
The entire ?ushing procedure may take less
thanan ,hourtand hence. there is substantially no
50 ’
ing a floor ll, side walls l2, a ?lter bed’ l3 oi" any
suitable! ?lterv medium such as stones, and a ro
"tary distributor 1'4'. Sewage to be treated‘renters
the system at it vand" normally‘ ?ows through a
objectionable interruption of’ the sewage. treat;
ment... Thereis. no accumulation of untreated a55‘ screen I‘! to‘ pipe l8 and through support means
sewage to. be released "all at, once. at the end’ of.‘ a
3
2,403,695
or pedestal £9 to rotary manifold 2|, from which
it ?ows into distributor arms 22 which constantly
rotate at a fair speed so that the sewage liquor
is sprinkled fairly lightly all over the surface of
the ?lter bed l3. The discharge ori?ces in the
arms 22 are spaced much more closely together at
the outer end of the arm than at the inner end
because'of the ‘fact that a much larger area of
the ?lter bed is sprinkled by each linear foot of
4
According to the present invention, this ?ush
ing of the ?lter bed is preferably accomplished
with very little labor and with very little addi~
tional expense. .The rotary distributor may be
used for this purpose, although it is preferably
modi?ed by the provision of auxiliary ori?ces
so that the discharge from the distributor arm
will be uniform along its length instead of dif
ferential along its length to compensate for the
g the arm at the outer end than at the inner end. 10
greater ?lter area at the outer end.
In other words, the spacing of the ori?ces should’
ideally be such as to sprinkle the entire'bed uni
formly.
The reason
for these auxiliary ori?ces is that the rotation of
the distributor arm is greatly retarded during
?ushing and in‘ fact the arm moves so Slowly that
With the light sprinkling resulting from the
at any given instant its motion is negligible. By
normally rotating distributor M the amount of 15 this
is meant that the ?ow of liquor through a
water deposited at any one point on each revo
given
point of the ?lter bed is not greatly reduced
lution is so small that it trickles gently through'
by the movement of the distributor arm as com
the ?lter. With this method of operation‘ the
paréd‘to ‘what the ?ow of liquor would be if the
biological ?ocs which accumulate on the rock and
?lter armwere entirely stationary.
which are necessary to the puri?cation of the 20
With a" substantially stationary ?lter arm it
sewage are not ?ushed away except that, as they
will be realized on reflection that the greater area
become larger and larger, they will eventually be
of the ‘bed near the periphery thereof has no
broken off or broken apart, often by the weight
signi?cance. The arm is not sprinkling the
of the ?oc itself rather than by the ?ow of water.
whole area at one instant but only the zone along
This- gentle trickling action also leaves un 25 the arm, and the flow required to saturate this
disturbed tremendous numbers of larvae of the
zone‘ is as great near. the inner end of the arm
?lter ?y, which in due time develop into ?lter
as at the outer end, the water having the same
?ies which in turn will deposit millions of eggs
tendency
in each position to spread laterally as
within the- ?lter bed. It has long been recog-'
it ?ows‘ downwardly.
‘
I
nized that the ?lter ?ies in the vicinity of a 30
Fig. 2 is a diagrammatic ?gure showing the
trickling ?lter are very annoying, possibly a
spacing of the ori?ces. The downwardly ex
health menace, and in any event give rise to
tending lines 26 represent the positions of the
perhaps the strongest objection to the use of
trickling ?lters.
' ‘Efforts to rid the trickling ?lters of the ?lter
?y have consisted mainly in ?ooding the ?lter
with the idea of drowning the ?ies and perhaps
with the additional expectation of drowning the
larvae. This ?ooding of the ?lter has been very
objectionable, however, because when the ?ood
ing period is over and the pent-up sewage is re
leased there is great danger of overloading the
following sewage treating equipment or in pol
normally open ori?ces. The position of these
normally open ori?ces may be conventional and
it will be observed that the ori?ces are spaced
much closer together at the outer end of the
arm than at the inner, end of the arm. The
upwardly extending lines 21 indicate the positions
of the auxiliary ori?ces‘ which are normally closed
but which may be opened ‘during ?ushing. It
will be observed from Fig. 2 that these auxiliary
ori?ces are not present at the outer end of the
arm, where the normally open ori?ces are close
luting a stream if there is no adequate treatment
together, but supplement theother ori?ces in an
‘subsequent to the release of the sewage from the 45 increasing ratio so that at the inner end of the
?ooded ?lter.
'
Furthermore, I have determined that the ?ood
ing of the ?lter in this manner does not kill the
larvae and 'I have developed a method and ap
paratus which are effective for getting rid of the
I larvae.
If a large ‘volume of liquor is run onto the
?lter bed at one'point therein, the liquor will not
trickle gently through the ?lter as in the normal
‘operation of the ?lter but will run rapidly down
wardly through the rock, tearing off from the
rock anything that is readily separable there
arm there are three supplementary ori?ces to
one normally open ori?ce. Ideally, the ?ow of
liquor discharge from the arm during ?ushing
should be at the same rate per linear foot of arm
along the entire‘ length of the arm.
,
One of the auxiliary ori?ces 28 is shown in
Figs. 6 and 7, together with a cover or valve plate
29 which is readily shiftable, being secured in
closed position by wing nuts 3| and in open posi
‘tion by one of these wing nuts. Usually, for
?ushing, the cover plates will be opened all the
way so as to leave the ori?ces entirely unob
from. Great quantities of ?ocs will ‘be torn loose
structed. There may be occasion, however, when
and washed down through the ?lter and out
it will be desirable to have them partially closed
through the'?lter drain, and the ?lter ?y larvae 60 in order'to obtain a more uniform discharge of
will be carried with these ?ocs. The larvae may
liquor along the length of the arm. The exact
then be disposed of or killed in any suitable way,
construction of the ori?ces and their closures is
usually by being settled out and carried to the
not especially important, but, according to the
‘digester where the natural action of the digester
preferred form, an ori?ce plate 32 is secured to
kills the larvae. '
My method of ridding the filter of the ?lter
?y nuisance therefore consists in. supplying a
~su?‘icient volume of liquor to a given portion of
65 the distributor arm 22 in any suitable manner
as by'screws 33 shown in Fig. 5. The wing nuts
3| may screw on threaded studs carried by the
ori?ce plate 32. The ori?ce plate is provided
the ?lter bed, and eventually to all portions, to
with a ring 34 having its outer face in a plane
wash from the ?lter substantially all of the ?l~ 70 so that it may be closed by a ?at plate 29'.
ter ?y larvae or at least a su?cient proportion
In the case of the normally open‘ ori?ces 36
thereof to keep the ?y population so reduced that
there is no necessity for providingthe ori?ce
it‘ will not constitute a nuisance. In short, the
plate 32 since these ori?ces 36 neverneed to be
,larvae are flushed out of the ?lter bed by ab
closed. They can be regulated by any arcuately
normal volumes of liquor ?owing therethrough. 7,5 shaped plate 31, illustrated in Figs. 5 and 8.
2,4034: as V
.
. .Theprovision of some HIGQLIlSiQI'iSIlI‘EBZdiIIQihG
liquor- discharged from the ori?ce: 36 is: convene
regard‘, Witha proper settingiof" the nuts 56‘ the
arms 22 will creep :aroundatavery. slow speed
>-,_'-perhaps about ten ' minutesv ta- one‘ hour per
_
‘revolution. ' Although'the explanation‘ of how this
bestin Fig; 8. ‘ Water discharged through an orig
against plate M: which reverses thé-‘?'owof'the
.
In practice, however, there is no "difficulty, in this
tionalpJ ‘It. is‘ preferred thatcontinuous spreader
‘ands-12. bei‘provided along: the length of.’
the arm EZQTthev plate." 4 lfbe'ing carried; by the‘ plate‘
platesi
M'whichinl turn isi'se'cured to the arm 22; as seen
flce' 3‘6 ‘flows againstftheplatEA-Z and isf'directed
6
tion. of thebrake, the brake would continue to.
slide andi‘thei speed. of; rotationv would.v increase.
is‘accomplished: is not necessaryqnor "is. it even
~ _ necessary'rthat I knowghow.it1..is<accomp1ished, I
have determined byinvcstigationthat theclutch' .
water‘ and spreads" it. cut into: a. thin sheet' or, 10 or: brakev 54!. does not. yield or ‘slide v~‘continuous1y
coarse spray'..~
having; theaspreade'r plates-4i?
but‘slides in a series of; separate jump-s.‘ ' Ap
and 42' extend continuously along the length of
parently there is enoughresiliehcy inthesystem, '
the‘: arm, these same-‘plates may‘ he‘usedto spread '
probably in the long arms 722', so. that the arms .
the liquor discharge from the ori?ces 218 when
15 move slightly While the brake. remains- immobile
the plates‘29 are open.
'
‘
until a suf?cient tension is builtup in the rotary
The flow? of. water against and away from the structure; to overcome the friction in the brake,
plate 41 ‘exerts. a pressure on they plate. at which
whereupon the brake: yields, the" tension. is re
Will cause va rotation of the arm in the/‘direction
leased, and the brake again holds to prevent iur- ‘
indicated by the‘ arrow 5'4 in Fig; 8, assuming that
20 theryieldingtuntil the tension of thezrotary parts:
the‘ arm- isfree to~rotalte._ ‘According to the; pres
ent invention, the arm is rotated by this reaction
flushing, means being provided for re
series of independent.‘ steps; "the outer ends ‘of
tarding the rotation so’ that the arm moves vmuch .
theOf:arms»
course,
seem
there
to: beare‘
rotating.
a Wide constantly.
variety of clutches
is again'bniltnp.
*‘Although the brake‘yields
'
‘more slowly‘ than if the retarding vmeans were
which could function inthisv manner; One which
not provided. The retarding means is seen in» 25 has'beenfound to’ be: satisfactorynis of the-con
Fig. 5, but to understand’it" themountin'g of. the
distributor arms should be explained. -
‘
struc'tion clearly illustrated. in Fig; 5'
'
rIihe distributor arms 2?. are connectedto the:
rotary manifold '25! which is carried by a rotating ‘
head 46. The headillliv is rotatably supportedgat
“Ray
b'estos” molded clutch. plates sandwiched between
plates of’Di’st'on saw steel, one set of. plates ber~
30 ing splined to' the hub: ‘58> while the other set. isv
splined to the r'i'ng?it. Of course, allthe‘ plates
the topio‘f’ an: extension N of pedestal I9‘, roller
are spli'nedt loosely enough- so that they may shift
bearings 481 preferably being provided to ‘ensure
apart and as: a result the pressure on their faces
easy rotation of'the rotary-distributor. The‘head
will be determined.by'ithe'pressure, ofthe' pressure
46' also carries a clutch housing. 49 on the top of
plate: ‘if under ‘in?uence: of a. plurality of springs ~
which i's-rmo'unted a gearbox ‘5.1 onthe top of 35 5? andnuts 55 around'its'periphery.
.
which is mounted a driving motor 52.. The rotor
{if course, it is not necessary'to the present
of the" motor is connected through. the gears in
‘the gear box 5! to a shaft 53 so'that the motor ?
produces a torque between the shaft 53 and the
housing Parts 51; 49","4'6'. If the shaft? 53' is‘ re 40
strained from rotating; the motor will therefore
rotate the housing members and through them
the‘ distributor arms 22;. The shaft.- 53 is thus
normally restrained from rotation ' by, clutch ‘unit
However, when themotor initially starts
invention to: use a-mot'or driven distributor arm
nor toretardi it-by' means of a frictional brake.
It couidbe retarded by any other-means, as, for
example, by henna-van operator moving slowly
yaroimdj the'periphery of the bed and restraining
reaction driven distributor arm by hand so that
its'cmo‘v ement is negligible.
Engorder toi'flush any ?lter fly-larvae from» the
side: walls f2
the tank it is preferred to pro
with the distributor arms at rest vit takes an
vide
orifice Ed at the outer end of the arm’.
appreciable time to bring the, distributor arms
This ori?ce may conveniently be drilled through
up to? speed‘ ineview of their inertia, and during
an end. plate 64. secured; on‘ the end‘ oi’a distribu
this time the clutch 54- sl'ips to permit the shaft
tor‘ arm 22., as clearly shown. in Figs. 3- and. Li.
50
53-" to‘ rotate so that the motor can start quickly
A» spreader plate 66: is preferably provided but it ‘ "
in spite‘ of this slow starting of? the distributor
should be disposed so that. a substantial amount
arm.
I
oi the water‘ from the ori?ce 63-.Will fall against
I have determined that with the clutch con
struction shown and with the proper adjustment
of the tensioning nuts 56 to provide the proper
pressure through springs 51 on the clutch plates,
this clutch may be used, very ‘satisfactorily for
retarding the speed’ of rotation of the distributor
theinner face of the Wall l2 and run down the
wall. SincePthis is a vertical and relatively
> smooth: surfacanot very much water is required
for keeping it free of larvae. Accordingly, the
orifice 63 may be left open at [all times. The
plate as is preferably mounted in the manner i1
arms 22 during ?ushing. In other wordsior re
lustratcd' so that it may readily be opened for
tarding the distributor arms 22 during flushing v60
cleaning the distributor arm. 22.
it is merely necessary to turn off. the motor 52.
For best results in. the practicing of this in
The gears'ofthe gear; box M are self-locking’ so
vention», it is necessary to have a copious volume
that there will be no rotation between the shaft
ofiliqu‘or. In
instances- the supply of sew»
53 and the housing 49. Accordingly, the shaft
age may be ‘adequate to- provide this copious
53 must rotate. with the arms 532', and if the shaft 65 how even when the auxiliary ori?ces are opened.
53 is restrained from rotation the'arms 22. will
When such is not the case, however, means for
not‘rotate. The clutch 54 thus becomes a friction '
recirculating; the sewage is preferably provided.
brake, tending to restrain rotation of the arms
As shown in Fig. I, this.
may comprise
22. The speed may be varied, by adjusting the
a
pump
‘H
driven
by
a
motor
12.
and
connected
70
‘tensioning nuts 56.
in a conduit '23;- between the drain ‘M for the
It may be surprising that any satisfactory regu
lation of the arms 22 at very low speed can be
obtained by a friction brake with‘, a constant ad~
justment. It might seem. that, once a rotational
force is provided sufficient to overcome the:v fric
trickling. ?lter and the in?uent conduit 16 or
the chamber 1-6. Avalve ‘H is provided to prevent
?ow through the conduit 13' when, the’ pump 'H
is not running.‘ The, intake of the conduit '13
7
2,403,695
should of course be so arranged as to be assured
of being below the surface of the liquor ?owing
from the drain 14 even though this drain may
not be ?lled to capacity. One such arrangement
is illustrated diagrammatically at 18. In con
nection with the volume of liquor required, it may
be noted that the auxiliary ori?ces Will usually
be provided on only one-of the arms 22 and, if
8
about ten minutes (?ve, if the auxiliary ori?ces
are opened on both arms). Not only does this
end the ?y nuisance ‘but it also avoids the evils
formerly attendant upon ?ooding the ?lter in
an e?'ort to abate the ?y nuisance.
The ushing
of the ?lter in accordance with this invention
is so easy and such a slight and harmless in
terruption of the normal sewage treatment
desired, means could be provided for closing off
process that it may be performed as often as
the normally open ori?ces on the other arm so 10
may be desired.- Experience 'has illustrated,
as to concentrate all of the ?ow in the arm which
however, that oncea week is enough, and twice
is used for ?ushing. Best results are obtained by
a week might be said to provide a margin of
supplying enough liquor so that more liquor would
not materially increase the maximum downward
safety. Apparently all that is :necessary is to
?ush the ?lter out at intervals shorter than the
rate of ?ow at a given point, but rather the area 15 period elapsing between deposit of the ?y egg
to which it spreads.
From Fig. 5 it will be recognized that the liquor
must ?ow up through the pedestal I9 and out
into the arm 22. The pedestal I9 is stationary
and the arm and manifold 2| are rotating, and
hence some sort of rotary seal must be provided
between the pedestal I9 and the manifold 2|. In
‘Fig. 5 a mercury seal has been illustrated-a
skirt 8| carried by the manifold extending down
into a pool of mercury carried by the pedestal.
It will be recognized, of course, that ordinarily
there is not very much pressure on the liquor
and hence this seal is quite practical although
it does give some trouble and is fairly expensive.
The pressure will of course force the mercury
down on the inside of the skirt 8| until the pres
sure of the mercury on the outside of the skirt
' and the development of the larva into a ?y.
For
convenience this period may be called the non
?ying period.
'
If desired, a time switch may be provided to
shut off the motor 52 automatically every week,
or even everyday, forthe ?ve or ten minutes
necessary for ?ushing. Even without opening
the extra ori?ces, a large percentage of the larvae
will be ?ushed out when the arm is moving
slowly. During this period the pump motor 12
could be automatically started or placed under
control of a ?oat in’ chamber 1-6 to assure an
adequate supply of sewage. Of course, the aux
iliary ori?ces could be automatically opened if
the expense should seem justi?ed. Otherwise,
it will be best to supplement the daily automatic
?ushing with a more thorough weekly ?ushing.
balances the pressure on the inside.
It should be understood that the ?ushing does
A modi?ed form of rotary seal is illustrated in
not wash out all of ‘the ?ocs or bacterial slime
Fig. 9 which is believed to be both less expensive 35 but only the excess. That ‘which remains is
and less troublesome than the mercury seal.
enough to ensure very e?icient sewage puri?ca
Instead of a mercury seal, cup seals are provided
tion. This has been found to be true when the
between wall ‘83 carried by the pedestal and skirt
?ltering medium comprised blast furnace slag,
86. These cup seals may comprise ?exible cups
but it is believed that it would be equally true of
84 which may be made of leather. They may 40 any other suitable ?ltering medium.
be pressed onto the skirt 86 by a coil spring 81
Even aside from the ?y nuisance, it would be
forming a closed loop on the outside of the cup
desirable to ?ush the bed occasionally in accord
84. The cups 84 will of course be held in place
ance with this invention to prevent ponding. It
and sealed with respect to the wall 83 in any
may be that an important aspect of ?y abate
suitable manner as illustrated. The use of this
ment is in clearing away the excess ?ocs which
seal has an additional advantage in that it facili
would tend here and there to clog the interstices
tates the provision of steadying bearing means
between the stones, so that there is no protected
88 of suitable bearing material. The bearing
may be lubricated through a nipple 89. Any
grease which may tend to seep upwardly from
the bearing 88 will be retained by the upper seal
cup 84. An additional nipple 9| is provided for
place for the ?y larvae. It is berieved, however,
that the rapid ?ow of Waterlis extremely impor
tant for the direct purpose of washing out the
larvae. In this connection it should be noted
that best results are obtained by ?ushing at in
supplying a ring of grease or oil below the lower
cup 84. This ring will ?oat on the water in the
tervals shorter than the period during which the
?y remains in the larva stage, since the larva
annular chamber 92 so that it will at all times 55 is probably ?ushed out more easily than the egg.
lubricate the seal and protect the seal and the
I claim:
bearing from the water. The chamber 92 forms
1. A trickling ?lter including a ?lter bed, a
a settling chamber for any solids which may
rotary distributor therefor having support means
drop therein from the sewage liquor, and a plug
94 is provided for washing out such solids.
Of course, any other sealing medium besides
grease could be injected through the nipple 9|
providing that it is not injurious to the cup 84
and preferably not injurious to the bearing
at a central position, a distributor arm extend
ing outwardly therefrom, rotatably mounted
with respect to the support means, provided with
a plurality of normally open ori?ces di?erentially
spaced to provide greater volume of discharge
per linear foot of the arm near the outer, faster
should small amounts of it seep into the bear 65 moving end of the arm than near the inner end
in'g. If it is lighter than Water so that it ?oats
of the arm, and a plurality of auxiliary ori?ces
as described, a pet cook or gauge may be pro
disposed to supplement the normally open ori
vided for making sure that a su?icient supply is
?ces to provide approximately uniform discharge
present. If it is heavier than water, it may
throughout the length of the distributor arm,
?ll the entire chamber 92.
70 said ori?ces being so disposed that the discharge
From the foregoing it is seen that a highly
therethrough will tend to drive the arm, means
practical solution of the ?lter ?y problem has
normally rendering said auxiliary ori?ces inop
been devised. With very little additional equip
erable but adjustable to render them operable,
ment expense, all or nearly all of the ?y larvae
motor and speed-reducing gears for driving the
can be washed from the ?lter in the course of 75
distributor arm but which are self-locking to pre
new
10
substantial-1y annexe delivery 01? inner slang the '
length of he arms
'
'
"
15. A trickling?lter including a tank having
‘vent driving the motor by the distributor arm
when the motor is not energized, a friction drive
‘device through which power is exerted by the
ieiirciilerly capped side walls,’ a ?lter ‘béd ‘therein,
~m0t0r and gear unit to drive :the distributor arm,
said friction drive device being vadapted to let'
2+ :Wl?ry tli?trzipilltor
' therefor " having support
.
,
.r'leans at a central position, and a distributor
extending outwardly inspires},
the motor speed up quickly .while the arm is‘
.
,
earthly
--starting :sloWly and to let the arm move very
ted with respect-to the Support means cer
slowly, when the motor is turned off, underthe
malty ad ted to “provide greater ‘191111.118 91f £1.15
reaction iofiliquor pumped through the arm, and 10 charge per ‘linear foot of the arm near, the outer,_
faster moving end of the arm than near the inner
means for recirculating sewage from the outlet
end of the arm, and adaptable to provide ap
of the ?lter bed to. the distributor arm to provide
proximately uniform discharge throughout the
a large volume ?ow of liquor through the arm in
length of the distributor arm, and a substantial
the
supply
of
raw
sewage.
"
' dependently of
volume of discharge outwardly from the end of
i5
rotary
2. A distributor
trickling ?lter
therefor
including
having a.support
?lter bed,
means
the
toward and largely against the side wall.
6. A rotary distributor for ?lters, comprising
at a central position, a distributor arm extend-V
ing outwardly therefrom, rotatably mount-ed , support means, a rotary structure rotatably sup
ported thereby and including a ‘distributor arm
with respect to the support means, provided with
1 a plurality of normally open ori?ces differentially 20 having a plurality of normally open ori?ces
adapted to deliver more liquor per linear foot from
spaced to provide greater volume of discharge
the outer, faster moving portion of the arm than
per linear foot of the arm near the outer, faster
the inner portion thereof, a plurality of auxiliary
moving end of the arm than near the inner end
ori?ces normally closed but adapted to be opened
ofv the arm, and a plurality of auxiliary ori?ces
for cooperating with the normallyv open ori?ces
disposed to supplement the normally open ori?ces
to provide approximately uniform discharge
25~ to provide a substantially uniform delivery of
liquor along the length of the arm, and means
for retarding the speed of rotation of the arm, for
?ushing'the ?lter, to such extent that the degree
therethrough will tend to drive the arm, means
normally rendering said auxiliary ori?ces inop 30 of saturation of the portion of the ?lter immedi
ately below the‘ arm is not substantially lessened
erable but adjustableto render them operable,
by said rotation. ‘
V
1
motor and speed-reducing gears for driving the
7; A rotary distributor for ?lters, comprising
distributor arm but which are self-locking to,
rotary structure rotatably sup
_ support means, a
prevent driving the motor by the distributor arm
ported thereby and including a distributor arm
when the motor is not energized, and avfriotion
throughout the length of the distributor arm,
said ori?ces being so disposed that the discharge
having discharge means normally adapted to de
drive device through which power is exerted by
the motor and gear unit to drive the distributor '
arm, said friction drive device‘ being" adapted to
let the motor speed up quickly while the armis
starting slowly and to let the arm move very
slowly, when the motor is turned off, under the
reaction of liquor pumped through the arm.
liver more liquor per linear foot from the outer,
faster moving portion of the arm than the inner
portion thereof, auxiliary discharge means nor
40
mally closed but adapted to be opened for coop- ,
erating with the normally effective discharge ~
means to provide a substantially uniform delivery
of liquor along the length of the_ arm; said dis
tributor including means for retarding the speed
rotary distributor therefor having support means
at a central position, a distributor ‘arm extending 45 of rotation of the arm, for flushing the ?lter, to
such extent that the degree of saturation of the
outwardly therefrom, rotatably mounted with
portion of the ?lter immediately below the arm
respect to the support means, having ori?ces
3. A trickling ?lter including a ?lter bed, a
normally adapted to provide greater volume of
discharge per linear foot of the arm near the
is not substantially lessened by said rotation.
8. A rotary distributor for ?lters, comprising
outer, faster moving end of the arm thannear 50 support means, a rotary structure rotatably sup
ported thereby and includinga distributor arm
the inner end of the arm, and adaptable to pro
vide approximately; uniform discharge through
out the length of the distributor arm, said "ori
,?ces
being
so ‘disposed , that
the discharge
having discharge means normally adapted to de
liver more liquor per linear foot from the outer,
faster moving portion of the arm than the inner
therethrough will tend to drive the arm, motor 55 portion thereof, auxiliary discharge meansnor
mally closed but adapted to be opened for coop
and speed-reducing gears for driving the dis
erating with the normally effective discharge
tributor arm but which are self-locking to pre
means to provide a substantially uniform de
vent driving the motor by the distributor arm
livery of liquor along the length of the arm, and
when the motor is not energized, and a friction
means including a motor for driving the "dis
drive device through which power is exerted by 60 tributor arm and effective when the motor is de
the motor and gear unit to drive the distributor
energized for retarding the speed of rotation of
arm, said friction drive device being adapted to
the arm to such extent that the degree of sat
let the motor speed up quickly while the arm is
uration of the portion of the ‘?lter immediately
starting slowly and to let the arm move very
below’ the arm is not substantially lessened by
slowly, when the motor is turned off, under the 65 said rotation, said means including a spring-en
reaction of liquor pumped through the arm.
gaged friction clutch having one member driven
4. A rotary distributor for ?lters, comprising
support means, a rotary structure rotatably sup
ported thereby and including ‘a distributor arm
having a plurality of ori?ces normally adjusted
to deliver more liquor per linear foot from the
outer, faster moving portion of the arm than the
inner portion thereof, and auxiliary ori?ce areas
normally closed but adapted to be openedito sup
plement the normally open ori?ces to provide a
by the vmotor when the motor is energized and
otherwise‘ held stationarily,jand a cooperating
,m'emb'er
mounted to rotate with' the distributor
a
’ arm normally‘ driven by ‘the ?rst " member, the,
spring tension and other characteristics being
such that the clutch yields by a series of sepa
rate minute movements.
1,
' Q. A rotary ‘distributor for ?lters, comprising
11
2,403,695
support means, a rotary structure rotatably sup
ported thereby and including a distributor arm
having discharge means normally adapted to de
liver more liquor per linear foot from the outer,
faster moving portion of the arm than the inner
vportion thereof, auxiliary discharge means nor
mally closed but adapted to be opened for coop
erating with the normally effective discharge
means to provide a substantially uniform deliv
12
ery of liquor along the length of the arm, and
means for retardingthe speed of rotation of the
arm, for flushing the ?lter, to ‘such extent‘that
the degree of saturation of'th'e portion of'the
?lter immediately below the arm is not ‘substan
tially lessened by said rotation, the retarded speed
being one rotation in approximately 10 to 60 min
utes.
.
'
,
-
~
‘
'
i
JAMES'DLSWALKER.
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