US2355640A - Liquid clarification apparatus - Google Patents

Liquid clarification apparatus Download PDF

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Publication number
US2355640A
US2355640A US44263842A US2355640A US 2355640 A US2355640 A US 2355640A US 44263842 A US44263842 A US 44263842A US 2355640 A US2355640 A US 2355640A
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United States
Prior art keywords
liquid
compartment
tank
primary
launder
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Expired - Lifetime
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English (en)
Inventor
Anthony J Fischer
William C Weber
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Dorr Co
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Dorr Co
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Priority to US44263842 priority Critical patent/US2355640A/en
Application granted granted Critical
Publication of US2355640A publication Critical patent/US2355640A/en
Priority to GB1609144A priority patent/GB575827A/en
Priority to NL123500A priority patent/NL66883C/xx
Priority to FR922452D priority patent/FR922452A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1205—Particular type of activated sludge processes
    • C02F3/121—Multistep treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/003—Sedimentation tanks provided with a plurality of compartments separated by a partition wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/10—Settling tanks with multiple outlets for the separated liquids
    • B01D21/12—Settling tanks with multiple outlets for the separated liquids with moving scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2433—Discharge mechanisms for floating particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/245—Discharge mechanisms for the sediments
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/04—Aerobic processes using trickle filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the invention hereof primarily relates to and revolves about a novel form of clarification or thickening apparatus embodying a single tank 4structure having a liquid-holding section that is divided by a partition vor partitioning means into functionally separated pirmary and secondary compartments that are in constant hydraulic communication through a passage area left because of the partition being only a partial one and certain other parts or features arranged in novel functioning relationship with respect thereto.
  • the tank structure or tank has a bottom, preferably with a depressed portion providing a sump
  • this sump is located at the bottom of the primary compartment. This is the preferred location for the sump. However, according to certain broad aspects of the invention the sump, if provided, is not necessarily located immediately below the primary compartment.
  • the tank is preferably equipped with suitable sediment-collecting and transferring mechanism that includes sediment-engaging and impelling elements which are operable over the floor or bottom of the tank and functionable to transfer 4sedimented material engaged thereby towards and into the sump.
  • the sump has sediment-withdrawal means for from time to time passing sedimented material therefrom to the exterior of the tank.
  • the tank is rectangular in plan and is equipped with a sediment-transfer mechanism embodying a conveyor of the endless type with a lowermost section or lowly positioned conveying element that is movable longitudinally and along the oor or bottom of the secondary compartment through the passage area below or provided by the partitioning means and continues along the oor or bottom of the pirmary compartment until it has delivered the sludge transferred thereby into said sump.
  • a sediment-transfer mechanism embodying a conveyor of the endless type with a lowermost section or lowly positioned conveying element that is movable longitudinally and along the oor or bottom of the secondary compartment through the passage area below or provided by the partitioning means and continues along the oor or bottom of the pirmary compartment until it has delivered the sludge transferred thereby into said sump.
  • the tank-preferably the primary "compartment thereof may be provided with a scumrecciving troughand the conveying means referred to may also include a scum-transferring element disposed for operative association with the scum trough whereby the scum-transferring element can convey or push floating scum engaged thereby towards and into said trough.
  • a feed-receiving and distributing. means is provided for the primary compartment, and a collecting launder or other suitable collecting means is provided for receiving supernatant liquid passing thereinto from the upper interior portion of the primary compartment.
  • the horizontal spacing or arrangement just referred to calls for the feed-receiving and distributing means being located at the rear or receiving end of the tank, the collecting launder orv collecting meansproximate or in rear of the partition and the scum trough between the two preferably close to but somewhat in the rear of the collecting launder.
  • the secondary compartmenathis has a liquid feed-distributing means preferably close to or immediately ahead of the partition and an eluent launder horizontally spacedy from the liquid feed and distributing means, preferably at 3o the front or effluent ⁇ discharge end of the tank.
  • This eflluent launder, or liquid overflow means as it may be sometimesreferred to, has an overflow edge or section at sufcient height or elevation to determine the normal surface level of Vthe liquid within the tank.
  • the clarification tank or thickening apparatus which has just been referred to has been designed primarily for use in sewage disposal systems wherein there is employed in cyclic arrangement with the tank or thickening-apparatus a biologic treating means essentially embodying a bed or beds of discrete material having biologically active organisms therein or, as otherwise expressed, having biologically active organisms upon the surface of the descrete material con'- stituting the bedor beds.
  • a biologic treating means essentially embodying a bed or beds of discrete material having biologically active organisms therein or, as otherwise expressed, having biologically active organisms upon the surface of the descrete material con'- stituting the bedor beds.
  • This novelform of tank is arranged and employed in a novel manner in association with. such biologic treating means as will hereafter more fully appear.
  • 5o clarification tank or thickening unit comprising the tank has use, however, in other fields and the tank and the parts associated therewith can be broughtinto novel operative relationship in diverse ways as will be manifest from that follows which ./f
  • Such bed provides biologically active organisms that decrease the biologic oxygen demand of polluted liquid passing therethrough. From that which will follow one will see that various modes of flow and distribution is obtained or realized by the piping arrangement or systems shown, each and all of which will be. more clearly brought out in conjunction with the specic description relating to the systems or owsheets hereinafter referred to.
  • Fig. 1 is a plan viewpartially in horizontal section-of a sewage treating system wherein the plural-compartment rectangular tank is operatively connected in. association with a laterally disposed biologic treating means having a single bed of discrete material, to wit, a biologic treating bed which is in the form of a trickling filter.
  • Fig. 2 is a view showing the tank in vertical longitudinal section, to wit, primarily as a view taken on the vertical plane indicated by the broken line 2 2 of Fig. 1, looking in the direction of the arrows.
  • a portion of the tank structure has been broken away so as to show the relative vertical elevation of the trickling ilter which is laterally disposed with respect to the tank structure.
  • the trickling filter is at elevation substantially lower than that of the normal surface level of the liquid within the tank and that the trickling lter is shown in vertical section.
  • Fig. 3 is a detailed vertical sectional viewillustrating more clearly the central portion of the tank in the region of the vertically and transversely extending partial partition of the tank.
  • Fig. 4 is a plan view of the same type of pluralcompartment tank connected in operative association with a laterally disposed biologic treating means provided by a single trickling filter.
  • Fig. 5 is a vertical sectional view of the tank taken as on the vertical plane indicated by the broken line 5--5 of Fig. 4 looking in the direction of the arrows.
  • a certain portion of the side wall of the tank has been broken away to show a basin or well providing a liquid commingling member.
  • the trickling filter is at elevation substantially above that of the normal surface level of the liquid within the tank. The trickling filter in this instance is also shown in vertical section.
  • Fig. 6 is a plan view showing the plural compartment-tank connected in operative arrangement with laterally disposed biologic treating means provided by two spacedly positioned trickling filters.
  • Fig. '7 is a vertical sectional view of the tank taken as on the vertical plane indicated by the broken line 'I--l vof Fig. 6 looking in the direction of the arrows.
  • the laterally disposed trickling filters are at elevation higher than that of the tank and are shown in vertical section.
  • the plural compartment tanks The tanks employed in each of the sewage treating systems illustrated are substantially the same ⁇ except that no scum weir is-shown in the form illustrated in Figs. 4 and 5. It is shown,
  • the tank or tank structure generally designated by I0 has a bottom section or floor providing member II having a depressed portion I2 providing a sediment-receiving section or sump I3.
  • the tank also has a marginal wall I4 rising from the bottom I I.
  • This marginal wall includes .a vertically and transversely extending rear end of the tank whereby it, with the spaced side walls of the tank, and with the underlying floor portion of the tank constitute means providing and defining a flow passage area 2
  • this partial partition divides the tank into functionally separated-primary and secondary quiescent liquid-clarifying zones or compartmentsheretofore respectively designated as 22 and 23. These compartments are in constant hydraulic communication with each other through the passage area 2
  • the primary compartment 22 is at the feedreceiving. end of lthe tank and the secondary compartment is at the front or eluent discharge end of the tank;
  • the primary compartment has a feed-receiving and distributing means collectively designatedas 2l, and which is provided by a feedreceiving and distributing launder 25 and a baffle member 26.
  • a feedreceiving and distributing launder 25 and a baffle member 26.
  • downwardly from the top portion of the tank a. substantial distance within the liquid-holding section of the tank and it is forwardly spaced'4 with respect to the rear end or wall I of the tank to provide a downwardly directed flow-path 21 whereby the incoming liquid is localized within the rear or receiving end ofthe tank until it is distributed into and across-the lower rear' end portion ofv the primary compartment 22.
  • This valve-controlled conduit 28 is relied upon for passing, accrdingto voperative requirements, sedimented material received within the sump I3. ⁇
  • the primary compartment ⁇ 22 is also provided with a collecting launder 30 that is preferably disposed immediately behind ⁇ the partial partii tion I9 and which is at elevation for receiving' This baiiie member 26 extends ⁇ CII ' the scum trough 51 referred to.
  • the collecting launder 30 it is sometimes referred' to as a submerged collecting means or member for the Iprimary compartment 22.
  • the liquid collected thereby may* be supernatant liquid or liquid material taken from any elevation in the tank and may even contain a considerable portion of solid materialsuch as is delivered from the secondary compartment by the sludge-'cob' lecting means.
  • this has a liquid-receiving and distributing means c ollec ⁇ tively designated as 3 I.
  • This distributing means embodies a receiving launder 32 and is preferably provided with a baffle 33 that is spaced a short distance ahead of the launder 32 whereby a downwardly directed flowpath 34 is provided from which downowing liquid is distributed Within and across the lower rear end portion of the secondary compartment 23. At they forward 0r discharge end of the tank there lis provided an eiliuent launder 35 for receiving supernatant liquid of the secondary compartment.
  • This launder 35 has an overilowweir or edge 36 that determines the normal surface level of the liquid within the tank.- Means in the form of a pipe or outow conduit is provided at 31 by which liquid overflowing into the launder 35 may be passed therefrom and it is from this' tube or conduit that liquid is released from the system in quantity corresponding to the quantity of feed supplied for treatment.
  • the co-mpartments 22 and 23 provide horizontally disposed quiescent sedimentation'zones and it will be clear that settleable material can gravitate from the liquid therein and deposit as sediment or sludge on the underlying floor portion or bottom of the tank. In order to effect a progressive ⁇ transfer of this sedimented material from diverse sections of the tank bottom to and into said sump there has been provided an end- .ing Opening for the scum passed thereto.
  • This conveyor embodies transversely spaced endless members as endless chains 4
  • These endless chains 4I have connected thereto transversely extending sediment-impelling elements in the form of Scrapers ⁇ or raking blades 41. These scraping elements extend across or transversely of the tank over the floor or bottom thereof and are longitudinally s-paced'with respect .to each other and are carried by the endless members 4I.
  • Each endless chain 4I comprises a forwardly movable'upper section or strand 50, a descending vertical section 5I, a forwardly movable longitudinal.
  • a transversely extending vertical baille 48 is disposed between the descending section 5 I and the overflow edge 49 of the collecting launder 3I'I.l In a tank structure where a scum launder as ⁇ 51 is employed this baille is located between the scum launder 51 and the edge 4 9 of the .collecting launder 30. .A
  • the scum trough A embodies a cylindrical member 58 slotted at the top to provide a receiv- This cylindrical member is mounted in seats 59 and has a handle Gilwhereby the position of ⁇ the slotted ⁇ portion of the trough 51 relative tothe ⁇ general level in the tank can be adjusted.
  • the biologic treating means is in the form of a trickling filter having a bed of discrete material 10 within a containingr structure 1I having a collecting section 12 for receiving lter eilluent.
  • this trickling filter bed is at elevation substantially lower than that of the general level ofthe liquid in the tank, liquid can flow by gravity from the collecting launder 30 through pipe or conduit 13, and from the effluent launder 35 through the pipe or conduit 15, and from the pipes 13 and 15, which may be viewed as branches, to a lateral main pipe 11 and upow pipe 18 then@ into a rotary distributor 19 by :which any liquid flowing thereinto is relatively v uniformly distributed over ⁇ the trickling filter bed.
  • the pipe 13 is provided with a positionablel trolled pipe 15, pipe sections 11 and 18 and the rotary distributing head 19 may be viewed as means for selectively passing effluent from the secondary effluent launder 35 tothe bed of the trickling filter or biologic treating means.
  • effluent from the filter bed is passed along the pipe or section conduit 80 from which it is conveyed by pump 8
  • , pipe section 82 and the valve-controlled pipe Section 83 constitute means for selectively passing and delivering filter effluent into the feed-receiving and distributing means for the primary compartment.
  • , the pipe section 82 and the valve-controlled section 84 constitute means for selectively passing and delivering filter effluent into the liquid-receiving and distributing means for the secondary compartment.
  • a sufficiently large quantity of liquidV can. be passed as from the collecting launder 30, or from the collecting launder 3
  • the biologic treating means is in the form of a trickling lter having a bed of will be a resulting back flow of liquid from the secondary compartment to the primary compartment, all of this taking place even though there is a release from the effluent launder of a quantity of liquid corresponding to the quantity of liquid supplied for treatment.
  • , the pipe section 82, and the valve-controlled pipe section 84 may be viewed as collectively consti-- tuting means embodying a pump for passing at will any desired quantity of liquid from the '-pridiscrete material 18 withina containing structure 1
  • This tricklling filter is at elevation substantially higher than that of the general level of the liquid within the tank.
  • the elevation of the trickling filter is sufficiently high whereby" the filter bed effluent can flow by gravity from the receiving and collecting section 12 through a valve-controlled pipe 90 into the launder 32 of the liquid-receiving and distributing means 3
  • This elevated position of the trickling filtertherefore necessitates the employment of means essentially comprising a pump for passing any liquid from, the multi-compartment tank upwardly to and upon the trickling filter bed.
  • the well receives a quantity of partially treated supernatant liquid of the primary compartment that is passed thereto from the collecting launder 3
  • the liquids received in this well are either commingled therein or effectively mixed before deliveryl to andfdistribution over the bed of the trickling lter'fa-nd for this reason the basin 93 is sometimes referred to herein as a cornrningling well.
  • the liquid is continuously passed from this ⁇ well 93 by a conveying and distributing means comprising pipe or conduit section 95, pump 96, pipe or conduit section 91, and a rotary distributor head B8 by which the thus pumped liquid is relatively uniformly distributed over the top lof the tricklingvrlter bed, or as otherwise expressed.
  • a conveying and distributing means comprising pipe or conduit section 95, pump 96, pipe or conduit section 91, and a rotary distributor head B8 by which the thus pumped liquid is relatively uniformly distributed over the top lof the tricklingvrlter bed, or as otherwise expressed.
  • the biologic .treatingmeans of this l system comprehends that which may be viewed as a primary trickling filter and as Aa secondary filter.
  • the primary tricking filter is'y shown con- :nected pnnclpa'ny'm assoclatlon Wlth' the pri' I25 ⁇ ling lter throgh the medium of the pipe or conduit section
  • the secondary trickling filter j 'bed is connected in-.association with the second-- ary compartment in a manner whereby the liquid of the secondary compartment is cyclically treated bygrepetitiveipasfsage as between itiand the' As to the secondary section of this system it includes the secondary trickling filter
  • This trickling filter has the bed of discrete material 10 5 the casing 1
  • the liquid within the commingling well namely, some of the liquid which is passed thereto from the effluent side of the primary biologic treating means and some of the liquid received thereinto from the effluent launder 35 is passed as commingled liquid from the well
  • this embodies a-prirnary trickling filter: yH30 that' includes a bed ofV discrete materiali'l, and a casing structure 1I- therefor 'having a filter effluent collecting section 1,2 from which the filter efiluent flows by gravity through a pipe or conduit section
  • - compartment or preceding compartment of such tank is believed to be new in apparatus or units of this general class and is indicative of a -feature of construction which ⁇ can vbe advantageously employedin multi-compartment tanks or clarifying units which may have embodiments of.
  • Apparatus for the continuous treatment of polluted liquids comprising a sedimentation y tank; partial partitioning means dividing the tank into hydraulically communicating primary and secondary clarifying compartments; means for removing sediment from said compartments; means for feeding polluted liquid to be received by the primary compartment, means for releasing clarified purified effluent from the secondary compartment at a rate corresponding to the rate of feed to the primary compartment, aerobic biologic means for treating impure liquid for de- 76 creasing the biologic oxygen demand of the thus treated liquid, means for transferring a quantity of clarified impure supernatant liquid from the primary compartment to said aerobic means,
  • said sediment removing means comprise means for impelling sedimented material settling from the liquid of the secondary compartment into the lower portion of the primary compartment tobe there joined with sediment settling from the liquid of the primary compartment, and means for removing such joined sediment from the primary compartment.
  • Apparatus for the clarification of' polluted liquids comprising a rectangular tank having a bottom and walls adapted to hold a body of liquid being treated, a partition having a lower edge portion vertically spaced from the bottom of the tank and dividing the tank transversely and functionally into primary and secondary clarifying.
  • a sediment sump associated with the primary compartment means for impelling sediment from both said compartments that collects on the tank bottom whereby sediment from the secondary compartment is passed to the primary compartment and sediment from the primary compartment is passed to the sump, feed-receiving and distributing means for the primary compartment, liquid-receiving and distributing means for the secondary uid to the liquid-receiving and distributing means of the secondary compartment, and means for passing to discard effluent from the effluent launder of the secondary compartment.
  • Apparatus according to claim 4 in which there is means for passing some of the Withdrawn further treated liquid to the feed-receiving and distributing means for the primary compartment, and in which there is means for controlling the amount of effluent passing from the efliuent launder of the secondary compartment. to proportion it relative to the further treated liquid fed to and distributed within saidsecondary compartment whereby there is maintained a hydraulic imbalance that effects a liquid ow from the secondary compartment to the primary compartment.
  • Apparatus for the purification of polluted liquids comprising a tank having a bottom and walls adapted to hold a body of liquid being treated, a partition dividing the tank func- A tionally into primary and secondary clarifying compartments, means providing a submerged flow passage area extending between a lower portion of the secondary clarifying compartment and the primary compartment whereby said compartments are in constant hydraulic communication, means for feeding each compartment separately, means for supplying liquid to be treated whereby it is ultimately delivered into the primary clarifying compartment through the feeding means therefor, a separate launder for receiving clarified effluent from each compartment, a sediment sump for and directly ⁇ below only liquid within the primary compartment, means for passing sedimented material from said sump, a primary biologic trickling filter bed, means for passing effluent from the primary compartment to the bed and/for returning filterbed discharge as augmented feed to that compartment, a secondary biologic trickling filter bed, means for passing a quantity of effluent from the secondary compartment to the secondary filter-bed and for returning lter-bedd
  • lpartitioning means functionally dividing ⁇ the liquid-holding region of the tank into primary and secondary compartments in constant hydraulic communication through the passage area hereafter referred to, and means providing passage area leading from the lower portion of the secondary compartment toward the primary compartment; feed-receiving and distributing means for said primary compartment; supernatant liquid-collecting means disposed at the upper portion of said primary compartment; liquid-distributing means for said secondary compartment; efiiuent collecting means receiving supernatant liquid of said secondary compartment and having an overflow level disposed at elevation sufficiently high for determining the normal surface level of the liquid within the tank; means for lmpelling sedi- 'mary compartment; means for passing sedimented material from the primary compartment; means comprising a pump for passing liquid from said supernatant liquid-collecting means of the primary compartment to said secondary liquid-distributing means in v quantity greater than that of the quantity of liquid overflowing into said secondary effl
  • a liquid-holding settling tank having a parv tial partition dividing the tank into functionally separate primary and secondary compartments that are in constant hydraulic communication through a passagearea left because of the partition being only a partial one, liquid distributing means for and corresponding to each compartment, means by which initially supplied incoming liquid is passed to the liquid-distributing means for the primary compartment, supernatant collecting means at the upper portion of and serving only the primary compartment, supernantant collecting means at the upper portion of and serving only the secondary compartment, means leading from the collecting means of the secondary compartment for releasing from the tank as clarified supernatant liquid a quantity of liquid corresponding to the quantity of initially supplied incoming liquid that is passed to the liquid-distributing means of the primary compartment, common sludge removal means for said compartments, and-mechanical means for establishing and maintaining a positively irnpelled flow of liquid from the collecting means for the primary compartment into the liquiddistributing means of the secondary compartment suicient in quantity to establish back-flow from the secondary compartment through said passage area and ⁇ into the primary compartment,
  • a liquid-treating tank for gravity separation of settleable solids from liquids partitioning means therein providing only a partial partition by which the interior liquid-holding portion oi.' the tank is divided into a feed-receiving primary compartment and a subsequent secondary compartment, which compartments are in constant hydraulic communication through passage area below a lower edge portion oi the partitioning means that is spaced from an underlying bottom portion of the tank, liquid feed means and liquid withdrawal means for each compartment, means for withdrawing liquid from the initial feed-receiving compartment and for delivering the thus withdrawn liquid into the secondary compartment for continuously maintaining.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Removal Of Floating Material (AREA)
US44263842 1942-05-12 1942-05-12 Liquid clarification apparatus Expired - Lifetime US2355640A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US44263842 US2355640A (en) 1942-05-12 1942-05-12 Liquid clarification apparatus
GB1609144A GB575827A (en) 1942-05-12 1944-08-23 Liquid clarification apparatus
NL123500A NL66883C (enrdf_load_stackoverflow) 1942-05-12 1946-02-12
FR922452D FR922452A (fr) 1942-05-12 1946-02-15 Appareil pour la clarification des liquides

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US44263842 US2355640A (en) 1942-05-12 1942-05-12 Liquid clarification apparatus

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US2355640A true US2355640A (en) 1944-08-15

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US44263842 Expired - Lifetime US2355640A (en) 1942-05-12 1942-05-12 Liquid clarification apparatus

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US (1) US2355640A (enrdf_load_stackoverflow)
FR (1) FR922452A (enrdf_load_stackoverflow)
GB (1) GB575827A (enrdf_load_stackoverflow)
NL (1) NL66883C (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419693A (en) * 1943-01-29 1947-04-29 Austin Co Sewage disposal system
US2708520A (en) * 1951-10-03 1955-05-17 James L Dallas Settling tank
US3123555A (en) * 1964-03-03 Automatic sewage disposal for individual homes and buildings
US3172849A (en) * 1965-03-09 Apparatus for improving the combined mechanical and biological clarification of town sewage or the like
US3261779A (en) * 1962-04-10 1966-07-19 Mead Corp Process and plant for treating sewage
US3966599A (en) * 1971-11-26 1976-06-29 Ecodyne Corporation Method and apparatus
DE2952706A1 (de) * 1979-12-29 1981-07-02 Grabowski Tropfkörper-Technik GmbH, 6352 Ober-Mörlen Abwasservorklaerung mit integrierter tropfkoerper-stufe
US20140076788A1 (en) * 2011-05-26 2014-03-20 Metawater Co., Ltd. Sewage treatment system
CN111320218A (zh) * 2020-04-02 2020-06-23 上海环境工程设计研究院有限公司 水处理重力配水装置及其配水方法

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123555A (en) * 1964-03-03 Automatic sewage disposal for individual homes and buildings
US3172849A (en) * 1965-03-09 Apparatus for improving the combined mechanical and biological clarification of town sewage or the like
US2419693A (en) * 1943-01-29 1947-04-29 Austin Co Sewage disposal system
US2708520A (en) * 1951-10-03 1955-05-17 James L Dallas Settling tank
US3261779A (en) * 1962-04-10 1966-07-19 Mead Corp Process and plant for treating sewage
US3966599A (en) * 1971-11-26 1976-06-29 Ecodyne Corporation Method and apparatus
DE2952706A1 (de) * 1979-12-29 1981-07-02 Grabowski Tropfkörper-Technik GmbH, 6352 Ober-Mörlen Abwasservorklaerung mit integrierter tropfkoerper-stufe
US20140076788A1 (en) * 2011-05-26 2014-03-20 Metawater Co., Ltd. Sewage treatment system
US10773981B2 (en) * 2011-05-26 2020-09-15 Metawater Co., Ltd. Sewage treatment system having a trickling filter with wash unit
CN111320218A (zh) * 2020-04-02 2020-06-23 上海环境工程设计研究院有限公司 水处理重力配水装置及其配水方法

Also Published As

Publication number Publication date
GB575827A (en) 1946-03-06
NL66883C (enrdf_load_stackoverflow) 1960-12-15
FR922452A (fr) 1947-06-10

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