WO1992003386A1 - Multi-step biological sewage treatment plant - Google Patents

Multi-step biological sewage treatment plant Download PDF

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Publication number
WO1992003386A1
WO1992003386A1 PCT/NO1990/000133 NO9000133W WO9203386A1 WO 1992003386 A1 WO1992003386 A1 WO 1992003386A1 NO 9000133 W NO9000133 W NO 9000133W WO 9203386 A1 WO9203386 A1 WO 9203386A1
Authority
WO
WIPO (PCT)
Prior art keywords
treatment
tank
wall
tanks
treatment tank
Prior art date
Application number
PCT/NO1990/000133
Other languages
French (fr)
Inventor
Roald Skaar
Torstein Wremer
Ragnar Skeie
Ralph Brandsvoll
Einar Linkjendal
Original Assignee
Bioscan A.S.
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 Bioscan A.S. filed Critical Bioscan A.S.
Publication of WO1992003386A1 publication Critical patent/WO1992003386A1/en

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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
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1242—Small compact installations for use in homes, apartment blocks, hotels or the like
    • C02F3/1247—Small compact installations for use in homes, apartment blocks, hotels or the like comprising circular tanks with elements, e.g. decanters, aeration basins, in the form of segments, crowns or sectors
    • 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
    • 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
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1242—Small compact installations for use in homes, apartment blocks, hotels or the like
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment
    • Y02A20/208—Off-grid powered water treatment
    • 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

  • Plants of this kind usually comprise one or more treatment or aeration tanks for the biological process, an inlet for sewage, an outlet for treated water and a conduit for air supply down in each treatment tank.
  • a settling tank is usually included, which can have a conduit for feeding back sludge from the bottom thereof to a preceeding treatment tank.
  • German patent applications Nos. 1 912 584 and 2 741 142 describe previously known arrangements of interest in this connection.
  • the latter German publication relates to a multi-step treatment plant having approximately the same water level in the different tanks or steps. These communicate with each other through tubular channels at substantially the same level corresponding to the common water level. Waterflow can take place in both directions through these tubes.
  • the former German patent application describes treatment in a single tank (possibly a double tank) having an air injection in order to establish a circulating water movement.
  • the present invention is based on air injection with a consequent water circulation corresponding in principle to the pattern of circulation shown in German patent application No. 1 912 584.
  • the treatment plant according to the present invention similarly to the above mentioned previously known designs, is based upon the sub-division of a clarifier chamber in each treatment tank.
  • Norwegian patent No. 161 437 proposes a multi-step biological sewage treatment plant in which each tank has a rectangular or square base and preferrably the same width, all the tanks being arranged end to end in the longitudinal direction and with overflow sills between the tanks.
  • the Finnish publication is directed to a very specific form of treatment of water, namely the removal of iron and manganese. This can not at all be regarded as analogous to biological treatment of sewage.
  • An essential point is to be seen in that this known design relates to a filtering process in which filter materials or filter layers constitute a substantial feature of the plant.
  • the present invention is directed to the attainment of an improved multi-stage biological treatment plant which among other things is well suited for installation buried in the ground without requiring space in apartments or buildings, at the same time as it has a much improved treatment function and a simplified design which is very robust with respect to the various forms of waste which may occur. Accordingly this treatment plant is very reliable in operation. Moreover it is an object of the invention to provide a design which to a high degree is space-saving in installation and makes possible an efficient manufacture, with favourable mechanical strength relationships in the structure and the composition of the various tanks included in the plant.
  • the invention takes as a starting point a multi-step biological treatment plant for sewage, comprising at least two treatment or aeration tanks having an inlet for sewage, an outlet for treated water and a conduit for air supply down in each treatment tank, and further comprising a settling tank as a final treatment step, said air supply conduit in each treatment tank being provided with its outlet relatively close to a vertical separating wall in the treatment tank and a baffle plate extending from a level above the operational water level in the treatment tank at an inclination downwards-inwards towards a vertical wall part in the tank at a space from the vertical separating wall, for establishing a clarifier chamber which is separated from the main part of the tank, but communicates with the latter through a lower opening in the clarifier chamber, said clarifier chamber having a volume which constitutes a small fraction of the total volume of the treatment tank.
  • What is novel and specific in the treatment plant according to the invention consists in the first place in that the treatment tanks are surrounded by a common vertical and cylindrical outer wall, that the settling tank is surrounded by a vertical cylindrical inner wall, that the treatment tanks are formed as sections between said outer cylindrical wall and said inner cylindrical wall, and that the separation walls between said treatment tanks are provided transversely from the outer cylindrical wall to the inner cylindrical wall, and are provided with overflow sills from the clarifier chamber in the treatment tank concerned, to the following treatment tank.
  • the drawing showns three treatment or aeration tanks 31, 32 and 33 incorporated in a circular arrangement and being enclosed by a surrounding outer cylindrical wall 30A which is common to the three tanks.
  • the succession or longitudinal direction of process steps through these treatment tanks 31, 32 and 33 in principle constitutes a partial or complete circle.
  • An inner vertical cylindrical wall 3OB forms another side wall for the treatment tanks and encloses a settling tank 34 which constitutes the last step in the process.
  • a settling tank 34 which constitutes the last step in the process.
  • a separation wall 49 is provided, this wall being without any overflow sill on top of it. Outlet or overflow from treatment tank 33 takes place over a sill 48 formed as a lowered portion of the upper edge of the inner cylindrical wall 3OB.
  • Baffle plates or walls 41A and 42A sub-divide treatment tanks 31 and 32 into a main volume and a clarifier chamber 41 and 42 respectively.
  • the overflow sills 46 and 47 are so located that they form outlets from the clarifier chambers 41 and 42 respectively.
  • the last treatment tank 33 has a baffle plate 43A which is not orientated radially like baffle plates 41A and 42A, but extends more or less cylindrically about an axis which can for example coincide with the axis of symmetry of the whole circular arrangement in the drawing.
  • a vertical baffle wall 45A which serves to form a downward inlet passage to the settling tank so that water flowing into it from the last treatment tank 33 results in the least possible stirring of the settling tank.
  • a conical lower part 50 of settling tank 34 serves to collect sludge being separated out, for possible feeding back through a return conduit 40 having a lower suction opening 40A and a discharge opening 40B above treatment tank 31. Return pumping of sludge through the conduit 40 can be provided for by means of an air-lift effect as know per se. Sewage or waste water is supplied through an inlet 36 and treated water leaves the treatment plant through an outlet
  • air is injected into the treatment tanks 31, 32 and 33 through air conduits as shown at 31A (nozzle or air outlet), 32A and 33A.
  • Arrows indicate the water circulation obtained in tank 31 by means of air injected through the air conduit nozzle or outlet 31A, and a corresponding air injection with consequent water circulation is effected in the other treatment tanks 32 and 33.
  • the drawing shows an example comprising three treatment tanks 31, 32 and 33 which are of substantially equal dimensions and thereby each comprise in principle approximately 120° of the circular arrangement.
  • the arrangement shown is preferred in practice, other arrangements based on the same principle may well be contemplated, for example either with a reduced number of tanks, such as two tanks, or with a larger number of treatment tanks than three, for example four tanks in a circular multi-step arrangement.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Biological Wastes In General (AREA)
  • Activated Sludge Processes (AREA)
  • Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
  • Medicines Containing Plant Substances (AREA)

Abstract

Multi-step biological sewage treatment plant comprising at least two treatment or aeration tanks (31, 32, 33) having an inlet (35) for sewage, an outlet (38) for treated water and a conduit for air supply (31A, 32A, 33A) down in each treatment tank (31, 32, 33), and further comprising a settling tank (34) as a final treatment step. The air supply conduit in each treatment tank (31, 32, 33) is provided with its outlet relatively close to a vertical separating wall (49) in the treatment tank (31). A baffle plate (41A, 42A) extends from a level above the operational water level in the treatment tank (31, 32) at an inclination downwards-inwards towards a vertical wall part in the tank at a space from said vertical separating wall, for establishing a clarifier chamber (41, 42) which is separated from the main part of the tank, but communicates with the latter through a lower opening in the clarifier chamber. The clarifier chamber (41, 42) has a volume which constitutes a small fraction of the total volume of the treatment tank. The treatment tanks (31, 32, 33) are surrounded by a common vertical and cylindrical outer wall (30A). The settling tank (34) is surrounded by a vertical cylindrical inner wall (30B). The treatment tanks (31, 32, 33) are formed as sections between said outer cylindrical wall (30A) and said inner cylindrical wall (30B), and the separating walls between said treatment tanks (31, 32, 33) are provided transversely from the outer cylindrical wall to the inner cylindrical wall, and are provided with overflow sills (46, 47) from the clarifier chamber (41, 42) in the treatment tank (31, 32) concerned, to the following treatment tank (32, 33). This sewage treatment plant is primarily intended for a small number of apartments or the like and can be buried underground.

Description

MULTI-STEP BIOLOGICAL SEWAGE TREATMENT PLANT
Previously, various arrangements for small sewage treatment plants intended in particular for the treatment of sewage from single houses, or groups of houses having a moderate number of inhabitants, have been proposed. Plants of this kind usually comprise one or more treatment or aeration tanks for the biological process, an inlet for sewage, an outlet for treated water and a conduit for air supply down in each treatment tank. As a last step in the treatment process a settling tank is usually included, which can have a conduit for feeding back sludge from the bottom thereof to a preceeding treatment tank.
Published German patent applications Nos. 1 912 584 and 2 741 142 describe previously known arrangements of interest in this connection. The latter German publication relates to a multi-step treatment plant having approximately the same water level in the different tanks or steps. These communicate with each other through tubular channels at substantially the same level corresponding to the common water level. Waterflow can take place in both directions through these tubes. The former German patent application describes treatment in a single tank (possibly a double tank) having an air injection in order to establish a circulating water movement.
Also the present invention is based on air injection with a consequent water circulation corresponding in principle to the pattern of circulation shown in German patent application No. 1 912 584. Moreover the treatment plant according to the present invention similarly to the above mentioned previously known designs, is based upon the sub-division of a clarifier chamber in each treatment tank.
In addition to the above reference will further be made to Norwegian patent No. 161 437 which proposes a multi-step biological sewage treatment plant in which each tank has a rectangular or square base and preferrably the same width, all the tanks being arranged end to end in the longitudinal direction and with overflow sills between the tanks. Reference is also made to Finnish published patent application No. 78 443 which, at least superficially, may seem to have some features resembling that which is to be described here, in particular the fundamental pattern of flow through the succession of chambers and overflow sills between these. The Finnish publication, however, is directed to a very specific form of treatment of water, namely the removal of iron and manganese. This can not at all be regarded as analogous to biological treatment of sewage. An essential point is to be seen in that this known design relates to a filtering process in which filter materials or filter layers constitute a substantial feature of the plant.
Still more remote in relation to the present invention is US patent 4 452 700 which inter alia is based on a horizontal flow pattern without any explanation of how any flow might take place vertically in the depth direction of the chambers or tanks shown. Two concentric chambers are illustrated, having openings for liquid exchange between the two chambers, but the openings extend completely to the bottom of the said chambers.
The present invention is directed to the attainment of an improved multi-stage biological treatment plant which among other things is well suited for installation buried in the ground without requiring space in apartments or buildings, at the same time as it has a much improved treatment function and a simplified design which is very robust with respect to the various forms of waste which may occur. Accordingly this treatment plant is very reliable in operation. Moreover it is an object of the invention to provide a design which to a high degree is space-saving in installation and makes possible an efficient manufacture, with favourable mechanical strength relationships in the structure and the composition of the various tanks included in the plant.
Thus, more closely and on the above background the invention takes as a starting point a multi-step biological treatment plant for sewage, comprising at least two treatment or aeration tanks having an inlet for sewage, an outlet for treated water and a conduit for air supply down in each treatment tank, and further comprising a settling tank as a final treatment step, said air supply conduit in each treatment tank being provided with its outlet relatively close to a vertical separating wall in the treatment tank and a baffle plate extending from a level above the operational water level in the treatment tank at an inclination downwards-inwards towards a vertical wall part in the tank at a space from the vertical separating wall, for establishing a clarifier chamber which is separated from the main part of the tank, but communicates with the latter through a lower opening in the clarifier chamber, said clarifier chamber having a volume which constitutes a small fraction of the total volume of the treatment tank.
What is novel and specific in the treatment plant according to the invention consists in the first place in that the treatment tanks are surrounded by a common vertical and cylindrical outer wall, that the settling tank is surrounded by a vertical cylindrical inner wall, that the treatment tanks are formed as sections between said outer cylindrical wall and said inner cylindrical wall, and that the separation walls between said treatment tanks are provided transversely from the outer cylindrical wall to the inner cylindrical wall, and are provided with overflow sills from the clarifier chamber in the treatment tank concerned, to the following treatment tank.
In the following description the invention will be explained more closely with reference to the drawing which in perspective view, and with certain parts cut away, shows an exemplary embodiment of a treatment plant based upon this invention.
The drawing showns three treatment or aeration tanks 31, 32 and 33 incorporated in a circular arrangement and being enclosed by a surrounding outer cylindrical wall 30A which is common to the three tanks. Thus the succession or longitudinal direction of process steps through these treatment tanks 31, 32 and 33 in principle constitutes a partial or complete circle.
An inner vertical cylindrical wall 3OB forms another side wall for the treatment tanks and encloses a settling tank 34 which constitutes the last step in the process. By means of preferably radial separation walls having upper horizontal edges or sills as shown at 46 and 47, the annular space between the two cylindrical walls 30A and 3OB is sub¬ divided into sections, each section constituting a treatment tank 31, 32 and 33 respectively.
At the upstream end of tank 31, and at the downstream end of tank 33 a separation wall 49 is provided, this wall being without any overflow sill on top of it. Outlet or overflow from treatment tank 33 takes place over a sill 48 formed as a lowered portion of the upper edge of the inner cylindrical wall 3OB.
Baffle plates or walls 41A and 42A sub-divide treatment tanks 31 and 32 into a main volume and a clarifier chamber 41 and 42 respectively. As seen from the drawing the overflow sills 46 and 47 are so located that they form outlets from the clarifier chambers 41 and 42 respectively.
The last treatment tank 33 has a baffle plate 43A which is not orientated radially like baffle plates 41A and 42A, but extends more or less cylindrically about an axis which can for example coincide with the axis of symmetry of the whole circular arrangement in the drawing. In the settling tank 34 there is shown a vertical baffle wall 45A which serves to form a downward inlet passage to the settling tank so that water flowing into it from the last treatment tank 33 results in the least possible stirring of the settling tank.
A conical lower part 50 of settling tank 34 serves to collect sludge being separated out, for possible feeding back through a return conduit 40 having a lower suction opening 40A and a discharge opening 40B above treatment tank 31. Return pumping of sludge through the conduit 40 can be provided for by means of an air-lift effect as know per se. Sewage or waste water is supplied through an inlet 36 and treated water leaves the treatment plant through an outlet
38.
In a manner known per se, air is injected into the treatment tanks 31, 32 and 33 through air conduits as shown at 31A (nozzle or air outlet), 32A and 33A. Arrows indicate the water circulation obtained in tank 31 by means of air injected through the air conduit nozzle or outlet 31A, and a corresponding air injection with consequent water circulation is effected in the other treatment tanks 32 and 33.
The drawing shows an example comprising three treatment tanks 31, 32 and 33 which are of substantially equal dimensions and thereby each comprise in principle approximately 120° of the circular arrangement. Although the arrangement shown is preferred in practice, other arrangements based on the same principle may well be contemplated, for example either with a reduced number of tanks, such as two tanks, or with a larger number of treatment tanks than three, for example four tanks in a circular multi-step arrangement.

Claims

C l a i m s
1. Multi-step biological sewage treatment plant comprising at least two treatment or aeration tanks (31, 32, 33) having an inlet (35) for sewage, an outlet (38) for treated water and a conduit for air supply (31A, 32A, 33A) down in each treatment tank (31, 32, 33), and further comprising a settling tank (34) as a final treatment step, said air supply conduit in each treatment tank (31, 32, 33) being provided with its outlet relatively close to a vertical separating wall (49) in the treatment tank(31), and a baffle plate (41A, 42A) extending from a level above the operational water level in the treatment tank (31, 32) at an inclination downwards-inwards towards a vertical wall part in the tank at a space from said vertical separating wall, for establishing a clarifier chamber (41, 42) which is separated from the main part of the tank, but communicates with the latter through a lower opening in the clarifier chamber, said clarifier chamber (41, 42) having a volume which constitutes a small fraction of the total volume of the treatment tank, c h a r a c t e r i z e d in that the treatment tanks (31, 32, 33) are surrounded by a common vertical and cylindrical outer wall (30A), that the settling tank (34) is surrounded by a vertical cylindrical inner wall (3OB), that the treatment tanks (31, 32, 33) are formed as sections between said outer cylindrical wall (30A) and said inner cylindrical wall (3OB), and that the separation walls between said treatment tanks (31, 32, 33) are provided transversely from the outer cylindrical wall to the inner cylindrical wall, and are provided with overflow sills (46, 47) from the clarifier chamber (41, 42) in the treatment tank (31, 32) concerned, to the following treatment tank (32, 33).
2. Multi-step biological sewage treatment plant according to claim 1, c h a r a c t e r i z e d in that the outlet from the last treatment tank (33) in the succession of treatment steps is formed by an overflow sill (48) provided as a lowered, horizontal portion of the upper edge of the inner cylindrical wall (3OB).
3. Multi-step biological sewage treatment plant according to claim 1 or 2, c h a r a c t e r i z e d in that the separation wall (46, 47, 49) between the treatment tanks (31, 32, 33) runs radially from the inner cylindrical wall (3OB) to the outer cylindrical wall (30A).
4. Multi-step biological sewage treatment plant according to claims 1, 2 or 3, c h a r a c t e r i z e d in that it comprises three treatment tanks (31, 32, 33) each of which occupy substantially 120° of the essentially circular arrangement of treatment tanks.
PCT/NO1990/000133 1989-04-28 1990-08-20 Multi-step biological sewage treatment plant WO1992003386A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO891805A NO167376C (en) 1989-04-28 1989-04-28 MULTI-STEP BIOLOGICAL CLEANING PLANT.

Publications (1)

Publication Number Publication Date
WO1992003386A1 true WO1992003386A1 (en) 1992-03-05

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PCT/NO1990/000133 WO1992003386A1 (en) 1989-04-28 1990-08-20 Multi-step biological sewage treatment plant

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DK (1) DK302789A (en)
NO (1) NO167376C (en)
SE (1) SE8902364L (en)
WO (1) WO1992003386A1 (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0761606A2 (en) * 1995-09-12 1997-03-12 Ökoservice Gesellschaft Für Umweltanalytik Und Kläranlagenbetreuung Gmbh Small clarification plant with a compact construction
WO1997043218A1 (en) * 1996-05-14 1997-11-20 Alliedsignal Inc. Immobilized cell bioreactor and method of biodegrading pollutants in a fluid
EP0838436A1 (en) * 1996-10-22 1998-04-29 TAKASHIMA, Yasuhide Automatic purification method of waste liquid/waste water and drainage by complete fermentation method and apparatus therefor
AT403902B (en) * 1996-11-13 1998-06-25 Beisteiner Ernst Container for receiving a liquid
US5961826A (en) * 1997-07-10 1999-10-05 Kim; Woon-Chang Biological waste water treatment system having a sedimentation tank vertically combined with an aeration tank therein
WO1999057068A1 (en) * 1998-03-20 1999-11-11 Ökoservice Gesellschaft Für Umweltanalytik Und Kläranlagenbetreuung Mbh Fully biological premises sewage treatment installation
EP1020409A1 (en) * 1999-01-15 2000-07-19 The Plastics Development Centre Limited A sewage treatment system
EP1559686A1 (en) * 2004-01-14 2005-08-03 Markus Baumann Clarification device with outlet device for clarified water
WO2008006175A1 (en) * 2006-07-13 2008-01-17 Hi-Flow Systems Pty Ltd Modular wastewater treatment tanks with releasable connections
CN105461059A (en) * 2015-12-24 2016-04-06 武汉钢铁(集团)公司 Integrated wastewater biological treatment reactor
CN105585229A (en) * 2016-03-10 2016-05-18 苏州优德通力科技有限公司 Single house type sewage treatment structure
CZ306129B6 (en) * 2009-07-13 2016-08-17 Eco-Chem Research, s.r.o. Domestic reactor for treating wastewater
CZ306698B6 (en) * 2012-11-02 2017-05-10 Eco-Chem Research Agency S.R.O. Reactor installation for waste water treatment
RU2778532C1 (en) * 2021-12-01 2022-08-22 Анатолий Петрович Кравцов Compact installation for complex water treatment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1907599A1 (en) * 1969-02-14 1970-09-03 Wangner Fa Hermann Basin for activated sludge treatment plants
US3713543A (en) * 1968-09-23 1973-01-30 Dravo Corp Activated sewage plant
DE2340654B1 (en) * 1973-08-10 1974-08-29 August Dr-Ing Schreiber Small wastewater treatment plant
DE2741142A1 (en) * 1977-09-13 1979-04-19 Helmut Dipl Ing Dr Renner Domestic sewage treatment - in two biological stages with self-induced sludge recycling

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3713543A (en) * 1968-09-23 1973-01-30 Dravo Corp Activated sewage plant
DE1907599A1 (en) * 1969-02-14 1970-09-03 Wangner Fa Hermann Basin for activated sludge treatment plants
DE2340654B1 (en) * 1973-08-10 1974-08-29 August Dr-Ing Schreiber Small wastewater treatment plant
DE2741142A1 (en) * 1977-09-13 1979-04-19 Helmut Dipl Ing Dr Renner Domestic sewage treatment - in two biological stages with self-induced sludge recycling

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0761606A2 (en) * 1995-09-12 1997-03-12 Ökoservice Gesellschaft Für Umweltanalytik Und Kläranlagenbetreuung Gmbh Small clarification plant with a compact construction
EP0761606A3 (en) * 1995-09-12 1998-05-06 Ökoservice Gesellschaft Für Umweltanalytik Und Kläranlagenbetreuung Gmbh Small clarification plant with a compact construction
WO1997043218A1 (en) * 1996-05-14 1997-11-20 Alliedsignal Inc. Immobilized cell bioreactor and method of biodegrading pollutants in a fluid
EP0838436A1 (en) * 1996-10-22 1998-04-29 TAKASHIMA, Yasuhide Automatic purification method of waste liquid/waste water and drainage by complete fermentation method and apparatus therefor
AT403902B (en) * 1996-11-13 1998-06-25 Beisteiner Ernst Container for receiving a liquid
US5961826A (en) * 1997-07-10 1999-10-05 Kim; Woon-Chang Biological waste water treatment system having a sedimentation tank vertically combined with an aeration tank therein
WO1999057068A1 (en) * 1998-03-20 1999-11-11 Ökoservice Gesellschaft Für Umweltanalytik Und Kläranlagenbetreuung Mbh Fully biological premises sewage treatment installation
EP1020409A1 (en) * 1999-01-15 2000-07-19 The Plastics Development Centre Limited A sewage treatment system
EP1559686A1 (en) * 2004-01-14 2005-08-03 Markus Baumann Clarification device with outlet device for clarified water
WO2008006175A1 (en) * 2006-07-13 2008-01-17 Hi-Flow Systems Pty Ltd Modular wastewater treatment tanks with releasable connections
CZ306129B6 (en) * 2009-07-13 2016-08-17 Eco-Chem Research, s.r.o. Domestic reactor for treating wastewater
CZ306698B6 (en) * 2012-11-02 2017-05-10 Eco-Chem Research Agency S.R.O. Reactor installation for waste water treatment
CN105461059A (en) * 2015-12-24 2016-04-06 武汉钢铁(集团)公司 Integrated wastewater biological treatment reactor
CN105585229A (en) * 2016-03-10 2016-05-18 苏州优德通力科技有限公司 Single house type sewage treatment structure
RU2778532C1 (en) * 2021-12-01 2022-08-22 Анатолий Петрович Кравцов Compact installation for complex water treatment

Also Published As

Publication number Publication date
NO891805D0 (en) 1989-04-28
DK302789D0 (en) 1989-06-19
DK302789A (en) 1990-10-29
SE8902364D0 (en) 1989-06-29
NO891805L (en) 1990-10-29
NO167376B (en) 1991-07-22
SE8902364L (en) 1990-10-29
NO167376C (en) 1991-10-30

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