GB2077127A - Method of and apparatus for the deep aeration of sewage - Google Patents

Method of and apparatus for the deep aeration of sewage Download PDF

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Publication number
GB2077127A
GB2077127A GB8116030A GB8116030A GB2077127A GB 2077127 A GB2077127 A GB 2077127A GB 8116030 A GB8116030 A GB 8116030A GB 8116030 A GB8116030 A GB 8116030A GB 2077127 A GB2077127 A GB 2077127A
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GB
United Kingdom
Prior art keywords
sewage
nozzles
air
collector
conduits
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8116030A
Other versions
GB2077127B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OKREGOWA SPOLDZIELNIA MLECZARS
Original Assignee
OKREGOWA SPOLDZIELNIA MLECZARS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by OKREGOWA SPOLDZIELNIA MLECZARS filed Critical OKREGOWA SPOLDZIELNIA MLECZARS
Publication of GB2077127A publication Critical patent/GB2077127A/en
Application granted granted Critical
Publication of GB2077127B publication Critical patent/GB2077127B/en
Expired legal-status Critical Current

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Classifications

    • 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
    • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
    • C02F3/1294—"Venturi" aeration means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3132—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Physical Water Treatments (AREA)
  • Activated Sludge Processes (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

Deep aeration of sewage is carried out by pumping sewage from the vicinity of the surface of the tank to groups of nozzles (3) where it is mixed with air and then is ejected in the vicinity of the bottom of the tank. The passing of the sewage from the nozzles (3) draws in the air to be mixed therewith before ejection of the mixture from a collector (4) containing the groups of nozzles. <IMAGE>

Description

SPECIFICATION Method of and apparatus for the deep aeration of sewage The present invention relates to a method of deep aeration of in sewage-treatment plants with activated sludge and to apparatus for the application of the method.
In accordance with the known methods of deep aeration of sewage, air bubbles are released near the bottom of the tank through a layer of motionless sewage. The known apparatus for deep aeration comprise high-duty fans of high compression, and conduits distributing compressed air to aerating elements laid on the bottom or near the bottom of the tank, said aerating elements being most often in a form of perforated box-type grates.
According to the present invention there is provided a method of deep aeration of sewage wherein aerated sewage is collected in the vicinity of the surface of a treatment tank and then is fed through groups of nozzles where it is mixed with air before being ejected in the vicinity of the bottom of the tank.
According to another aspect of the inven tion there is provided apparatus for the deep aeration of sewage comprising a pump; groups of nozzles connected with the pump by means of conduits, each group of nozzles being situated in a collector individual to such groups; and conduits connected with the collectors For the supply of air thereto, the air supply conduits being connected with slots surrounding the outlet ends of the nozzles for the adr, tura of air with sewage leaving the said cutler ends of the nozzles, the collectors being provided with ejectors for the discharge of the rnilaiire of the air and sewage.
The collectors are preferably in a form of hollow cylinders with the nozzles having in cross-section the shape of equilateral triangles.
An advantageous effect of the invention is a considerable reduction of the costs of sewage treatment and enabling the sewage-treatment to operate in any atmospheric conditions.
The invention will be further described. by way of example, with reference to the accompanying drawings, wherein: Figure 1 presents a schematic drawing in axial section of a sewage aeration device embodying the invention; Figure 2 illustrates in axial section and to a larger scale the collector of the device of Fig.
1; and Figure 3 is a cross-sectional view of the collector.
Referring to the drawing, and more especially Fig. 1, a water pump 1 is immersed to a small depth in sewage being treated. The water pump 1 is connected with conduits 2 each connected to a group of nozzles 3 situated in a collector 4. Collectors 4 are connected with air supply conduits 5, and their forward ends they are provided with ejectors 6. At one end the nozzles are attached to a back wall 7 of the collector 4. The other, free ends 8 of the nozzles 3 situated in holes of a front wall 9 of the collector 4, and the holes in the front wall 9 are selected so that around the free ends 8 of nozzles 3 inlet slots or passages 10 are provided for the flow of air therethrough. Each collector 4 is preferably in the form of a hollow cylinder. The nozzles 3 in their cross-section, as shown in Fig. 3, are preferably in the form of equilateral triangles.
During the operation of the device the water pump 1 collects raw sewage in the vicinity of the surface of the tank of the sewage-treatment plant and forces it through the conduits 2 to the nozzles 3 of the collectors 4. Sewage flowing into the nozzles 3 causes negative pressure to occur in the collector 4, and to suck in the air which flows through the slots 10to be mixed with the sewage in the ejector 6. Dimensions of the ejectors 6 are selected so that the mixture flowing out gets an appropriate outflow speed at their outlets and is a smooth flowing mixture. Sewage flowing out from the ejectors 6 provoke the motion of sewage and sludge in the whole sewagetreatment plant, and air bubbles penetrating the layer of sewage cause efficient oxidation thereof.To the pump 1 a series of groups of nozzles 3 can be connected, depending on the delivery of the pump 1. In order to increase the effectiveness of aeration the air can be forced into the collector 4 by a fan of a small capacity and low compression.
The.method and the device for deep aeration can be also applied in aeration of breeding water basins.
1. A method of deep aeration of sewage, wherein aerated sewage is collected in the vicinity of the surface of a treatment tank and then is fed through groups of nozzles where it is mixed with air before being ejected in the vicinity of the bottom of the tank.
2. A method according to claim 1, wherein the air to be mixed with the sewage is drawn into the sewage by the action of the sewage being discharged through the nozzles into a collector chamber surrounding the group of nozzles.
3. Apparatus for the deep aeration of sewage comprising a pump; groups of nozzles connected with the pump by means of conduits, each group of nozzles being situated in a collector individual to such groups; and conduits connected with the collectors for the supply of air thereto, the air supply conduits being connected with slots surrounding the outlet ends of the nozzles for the admixture of air sewage leaving the said outlet ends of the nozzles, the collectors being provided with ejectors for the discharge of the mixture of air
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Method of and apparatus for the deep aeration of sewage The present invention relates to a method of deep aeration of in sewage-treatment plants with activated sludge and to apparatus for the application of the method. In accordance with the known methods of deep aeration of sewage, air bubbles are released near the bottom of the tank through a layer of motionless sewage. The known apparatus for deep aeration comprise high-duty fans of high compression, and conduits distributing compressed air to aerating elements laid on the bottom or near the bottom of the tank, said aerating elements being most often in a form of perforated box-type grates. According to the present invention there is provided a method of deep aeration of sewage wherein aerated sewage is collected in the vicinity of the surface of a treatment tank and then is fed through groups of nozzles where it is mixed with air before being ejected in the vicinity of the bottom of the tank. According to another aspect of the inven tion there is provided apparatus for the deep aeration of sewage comprising a pump; groups of nozzles connected with the pump by means of conduits, each group of nozzles being situated in a collector individual to such groups; and conduits connected with the collectors For the supply of air thereto, the air supply conduits being connected with slots surrounding the outlet ends of the nozzles for the adr, tura of air with sewage leaving the said cutler ends of the nozzles, the collectors being provided with ejectors for the discharge of the rnilaiire of the air and sewage. The collectors are preferably in a form of hollow cylinders with the nozzles having in cross-section the shape of equilateral triangles. An advantageous effect of the invention is a considerable reduction of the costs of sewage treatment and enabling the sewage-treatment to operate in any atmospheric conditions. The invention will be further described. by way of example, with reference to the accompanying drawings, wherein: Figure 1 presents a schematic drawing in axial section of a sewage aeration device embodying the invention; Figure 2 illustrates in axial section and to a larger scale the collector of the device of Fig. 1; and Figure 3 is a cross-sectional view of the collector. Referring to the drawing, and more especially Fig. 1, a water pump 1 is immersed to a small depth in sewage being treated. The water pump 1 is connected with conduits 2 each connected to a group of nozzles 3 situated in a collector 4. Collectors 4 are connected with air supply conduits 5, and their forward ends they are provided with ejectors 6. At one end the nozzles are attached to a back wall 7 of the collector 4. The other, free ends 8 of the nozzles 3 situated in holes of a front wall 9 of the collector 4, and the holes in the front wall 9 are selected so that around the free ends 8 of nozzles 3 inlet slots or passages 10 are provided for the flow of air therethrough. Each collector 4 is preferably in the form of a hollow cylinder. The nozzles 3 in their cross-section, as shown in Fig. 3, are preferably in the form of equilateral triangles. During the operation of the device the water pump 1 collects raw sewage in the vicinity of the surface of the tank of the sewage-treatment plant and forces it through the conduits 2 to the nozzles 3 of the collectors 4. Sewage flowing into the nozzles 3 causes negative pressure to occur in the collector 4, and to suck in the air which flows through the slots 10to be mixed with the sewage in the ejector 6. Dimensions of the ejectors 6 are selected so that the mixture flowing out gets an appropriate outflow speed at their outlets and is a smooth flowing mixture. Sewage flowing out from the ejectors 6 provoke the motion of sewage and sludge in the whole sewagetreatment plant, and air bubbles penetrating the layer of sewage cause efficient oxidation thereof.To the pump 1 a series of groups of nozzles 3 can be connected, depending on the delivery of the pump 1. In order to increase the effectiveness of aeration the air can be forced into the collector 4 by a fan of a small capacity and low compression. The.method and the device for deep aeration can be also applied in aeration of breeding water basins. CLAIMS
1. A method of deep aeration of sewage, wherein aerated sewage is collected in the vicinity of the surface of a treatment tank and then is fed through groups of nozzles where it is mixed with air before being ejected in the vicinity of the bottom of the tank.
2. A method according to claim 1, wherein the air to be mixed with the sewage is drawn into the sewage by the action of the sewage being discharged through the nozzles into a collector chamber surrounding the group of nozzles.
3. Apparatus for the deep aeration of sewage comprising a pump; groups of nozzles connected with the pump by means of conduits, each group of nozzles being situated in a collector individual to such groups; and conduits connected with the collectors for the supply of air thereto, the air supply conduits being connected with slots surrounding the outlet ends of the nozzles for the admixture of air sewage leaving the said outlet ends of the nozzles, the collectors being provided with ejectors for the discharge of the mixture of air and sewage.
4. Apparatus according to claim 3, wherein the collectors are each in the form of a hollow cylinder, and nozzles in cross-section are in a form of equilateral triangles.
5. Apparatus for the deep aeration of sewage constructed and arranged to operate substantially as herein described with reference to and as illustrated in the accompanying drawings.
6. Sewage treatment plant having an active sludge treatment tank provided with apparatus according to claim 3, 4 or 5.
7. A method of deep aeration of sewage substantially as herein described with reference to the accompanying drawings.
GB8116030A 1980-05-31 1981-05-26 Method of and apparatus for the deep aeration of sewage Expired GB2077127B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL1980224651A PL129048B1 (en) 1980-05-31 1980-05-31 Method of deeply aerating waste waters and apparatus therefor

Publications (2)

Publication Number Publication Date
GB2077127A true GB2077127A (en) 1981-12-16
GB2077127B GB2077127B (en) 1983-06-02

Family

ID=20003401

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8116030A Expired GB2077127B (en) 1980-05-31 1981-05-26 Method of and apparatus for the deep aeration of sewage

Country Status (8)

Country Link
CS (1) CS221833B2 (en)
DE (1) DE3121532A1 (en)
FR (1) FR2483392B1 (en)
GB (1) GB2077127B (en)
GR (1) GR74456B (en)
HU (1) HU181340B (en)
PL (1) PL129048B1 (en)
YU (1) YU41243B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2230204A (en) * 1989-03-28 1990-10-17 Yang Mu Cheeng Ou Water aeration device
DE4414272A1 (en) * 1994-04-23 1995-10-26 Erz & Kohleflotation Gmbh Device for gassing a suspension
GB2349101A (en) * 1999-02-25 2000-10-25 Redrock Eng Ltd An animal slurry pump feeds slurry to a venturi to which air is drawn or supplied
EP1358927A1 (en) * 2002-05-03 2003-11-05 Caterpillar Inc. method and apparatus for mixing gases
GB2457230A (en) * 2008-02-05 2009-08-12 Stephen Malcolm Westall A multi-nozzle aerator for aerating water
WO2012130415A1 (en) * 2011-03-28 2012-10-04 Haldor Topsøe A/S Mixing device
JP2021519203A (en) * 2018-03-28 2021-08-10 レール・リキード−ソシエテ・アノニム・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード Equipment and configuration for introducing gas into the main medium, especially in wastewater treatment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4461743A (en) * 1982-02-08 1984-07-24 Sterling Drug Inc. Oxygen injection nozzle for wet oxidation reactors

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE312900C (en) *
FR1304737A (en) * 1961-08-18 1962-09-28 Speichim Method and device for mixing fluids
DE2447369A1 (en) * 1974-10-04 1976-04-22 Basf Ag METHOD AND DEVICE FOR MIXING LOW-VISCOSE LIQUIDS IN HIGH-VISCOSE MEDIA
DE2530050A1 (en) * 1975-07-04 1977-01-27 Linde Ag DEVICE FOR GASIFICATION OF LIQUIDS

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2230204A (en) * 1989-03-28 1990-10-17 Yang Mu Cheeng Ou Water aeration device
DE4414272A1 (en) * 1994-04-23 1995-10-26 Erz & Kohleflotation Gmbh Device for gassing a suspension
GB2349101A (en) * 1999-02-25 2000-10-25 Redrock Eng Ltd An animal slurry pump feeds slurry to a venturi to which air is drawn or supplied
EP1358927A1 (en) * 2002-05-03 2003-11-05 Caterpillar Inc. method and apparatus for mixing gases
US6684719B2 (en) 2002-05-03 2004-02-03 Caterpillar Inc Method and apparatus for mixing gases
US6928890B2 (en) 2002-05-03 2005-08-16 Caterpillar Inc Method and apparatus for mixing gases
US7100459B2 (en) 2002-05-03 2006-09-05 Caterpillar, Inc. Method and apparatus for mixing gases
GB2457230A (en) * 2008-02-05 2009-08-12 Stephen Malcolm Westall A multi-nozzle aerator for aerating water
WO2012130415A1 (en) * 2011-03-28 2012-10-04 Haldor Topsøe A/S Mixing device
WO2012130254A1 (en) * 2011-03-28 2012-10-04 Haldor Topsøe A/S Mixing device
JP2021519203A (en) * 2018-03-28 2021-08-10 レール・リキード−ソシエテ・アノニム・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード Equipment and configuration for introducing gas into the main medium, especially in wastewater treatment
US11673102B2 (en) 2018-03-28 2023-06-13 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Apparatus and arrangement for introducing a gas into a main medium in particular in waste water treatment

Also Published As

Publication number Publication date
YU120981A (en) 1984-02-29
FR2483392A1 (en) 1981-12-04
CS221833B2 (en) 1983-04-29
YU41243B (en) 1986-12-31
PL129048B1 (en) 1984-03-31
GR74456B (en) 1984-06-28
HU181340B (en) 1983-07-28
PL224651A1 (en) 1982-01-18
GB2077127B (en) 1983-06-02
DE3121532A1 (en) 1982-05-27
FR2483392B1 (en) 1985-07-05

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PCNP Patent ceased through non-payment of renewal fee