GB2060422A - Automatic circulation in waste water pumping stations - Google Patents
Automatic circulation in waste water pumping stations Download PDFInfo
- Publication number
- GB2060422A GB2060422A GB8033082A GB8033082A GB2060422A GB 2060422 A GB2060422 A GB 2060422A GB 8033082 A GB8033082 A GB 8033082A GB 8033082 A GB8033082 A GB 8033082A GB 2060422 A GB2060422 A GB 2060422A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- bypass means
- pumping station
- pump
- outlet
- 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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/22—Adaptations of pumping plants for lifting sewage
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Sewage (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Sludge (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Fertilizing (AREA)
Abstract
In the outlet (5) from a pump unit (4) a valve (7) is provided which opens a outlet (9) between the pump outlet (5) and the bottom of the pumping station (1). The valve (7) is controlled electrically or hydrostatically for a predetermined time at the commencement of each pumping operation to disturb and mix-up the sludge with the pumped liquid. <IMAGE>
Description
SPECIFICATION
Automatic circulation in waste water pumping stations
The invention relates to a waste-water pumping station, such as one which is a part of a municipal sewage system.
In a pumping station, which also serves as a storage chamber for waste water, banks of sludge will occur at the bottom as well as by the water surface. These banks occur more frequently when the water velocity is low and pumping intervals are long.
A microbiological breaking down of the sludge takes place the speed of which depends on the temperature. When the oxygen has been used, a fermentative process takes place producing H2S (hydrogen sulphide), CH4 (methane) etc. Acid is also produced which results in a lower pH value.
Hydrogen sulphide smells and is also poisonous.
Mortal accidents have occurred by service works in hydrogen sulphide filled pumping stations.
The hydrogen sulphide produces, together with oxygen, sulphuric acid having a pH value near 1.
This means heavy corrosion damage on details above the water surface such as electrical equipment and armature. In addition to this the pipe system corrodes when the water is pumped through. Pipes made of concrete may collapse because of corrosion and so block the connection.
The methane gas can easily be set on fire causing explosions. In order to prevent that it has been necessary to use expensive explosion proof installations.
In order to prevent sludge banks from occurring the pumping stations are flushed with clean water at regular intervals so that the sludge banks are broken down and mixed in the water.
This method to get rid of septic sludge is however very expensive as the sludge becomes septic after 4-6 hours in Northern Europe and within 1-3 in a tropic climate.
According to the present invention there is provided a method of operating a waste water pumping station containing one or more pump units, including the step of automatically opening a bypass means so that for at least one predetermined period of time during a pumping operation the pumped liquid recirculates in the pumping station to disturb and mix sludge lying at the bottom of the pumping station with the liquid being pumped, closing the bypass means at the end of said period, and continuing with the pumping operation.
The invention is described more closely below with reference to the enclosed drawings, in which: Fig. 1 shows a pumping station provided with a valve according to an embodiment of the invention,
Fig. 2 shows a pumping station where the valve is arranged differently, according to another embodiment,
Fig. 3 shows a suitable valve having a special kind of control device, and
Fig. 4 shows a further embodiment of a valve suitable for use in the pumping station of Fig. 1 or
Fig. 2.
In the Figures 1 stands for a pumping station having an inlet 2 and outlet 3; 4 stands for a submersible pump having an outlet 5 connected to a discharge unit 6 on the outlet pipe 3; 7 stands for a valve with a central device 8, outlet (spreader) 9 and outlet pipe or return pipe 10; 11 and 12 stand for water levels; 13 stands for a valve piston; 14 a rollmembrane; 1 5 a levelling tank; 1 6 a partition wall; 1 7 a return spring; 18 a valve needle; 19 a valve rod; 20 a pipe; 21 a connection pipe; 22 a valve plate and 23 a lever.
In Fig. 1 a conventionally equipped pumping station 1 is provided with a device according to the invention. According to the previous known method the pump 4 starts when the water level reached 1 The pump then works till the level 12 has been reached and restarts when the level 11 has been reached again. Valve 7 is connected to the outlet 5 of the pump 4. When the pump starts, the valve is open which means that the pumped medium flows back into the pumping station 1 and creates a strong current and mixing therein, thus homogenizing the pumped medium.
After a certain time the valve is closed and the medium is pumped through the outlet 3 in the usual way till the level 12 has been reached. The valve is then reopened and remain in this position till the next pump start.
In Fig. 2 another connection of the valve according to the invention is shown. When the valve 7 is open, the pumped medium flows back into the pumping station through the pipe 10 which ends near the bottom, where the sludge banks occur. In every other respect this device works in the same way as the device according to
Fig. 1.
The valves described above are controlled electrically. In Fig. 3 a hydrostatically controlled valve is shown which works in the following way:
When the pump starts the valve is open leaving an open connection between the pump outlet and the pumping station so that a return flow, described above, is obtained. The piston 13 is then in its upper position influenced by the spring 1 7.
The roll membrane 14 is pressed downwards by the pressure in the pipe 20 which is connected to the pump outlet. The speed of the downward movement, the closing time, is determined by a needle valve device where a leakage hole in a partition wall and the needle 1 8 cooperate. The closing speed may be varied by a waist on the needle. When the piston 1 3 has reached its lower position the connection pipe 21 is closed and remains so as long as the pump works. When the pump stops, the pressure in the pipe 21 decreases and the spring 1 7 presses the rollmembrane 14 and the piston 1 3 back to their original positions for a new mixing-pumping cycle.
In the embodiment shown in Fig. 4 the valve is formed like a two-way turnable valve arranged in the outlet 3. When the pump starts, the outlet is closed by the means 22, while the port to the return pipe 10 is open. The fluid is then flowed through the rotatable spreader pipe 9. The driving unit 8, which is controlled by a time relay, will, after a certain time, turn the means 22 so that the port to the return pipe is closed, while the port to the outlet is open.
Claims (13)
1. A method of operating a waste water pumping station containing one or more pump units, including the step of automatically opening a bypass means so that for at least one predetermined period of time during a pumping operation the pumped liquid recirculates in the pumping station to disturb and mix sludge lying at the bottom of the pumping station with the liquid being pumped, closing the bypass means at the end of said period, and continuing with the pumping operation.
2. A method according to claim 1 wherein the bypass means is always open at the commencement of each pumping operation.
3. An automatic liquid recirculation arrangement for a waste water pumping station comprising one or more pump units and bypass means connected to the pump outlet whereby, when the bypass means is opened, pumped liquid is recirculated in the pumping station to disturb and mix sludge lying at the bottom of the pumping station with the liquid being pumped, and means for opening the bypass means for at least one predetermined period of time during each pumping operation.
4. An arrangement according to claim 3 wherein said bypass means is arranged to be open at the commencement of each pumping cycle.
5. An arrangement according to claim 3 or 4 wherein the bypass means comprises an electrically controlled valve arranged in the outlet of the pump.
6. An arrangement according to claim 3 or 4 wherein the bypass means comprises a hydrostatically controlled valve arranged in the outlet of the pump.
7. An arrangement according to claim 6 wherein the valve includes a cylinder having a flexible membrane influenced by a spring connected to the valve to maintain the valve in an open condition against a reduced pump outlet pressure and pressure control means arranged to allow pressure build-up against the membrane to overcome the spring after a time interval to cause the valve to close.
8. An arrangement according to claim 5, 6 or 7, wherein the valve is positioned in the outlet pipe from the pump.
9. An arrangement according to any one of claims 3-8, wherein the bypass means is located above the maximum water level and is provided with a return outlet pipe ending adjacent the bottom of the pumping station.
10. An arrangement according to any one of claims 3-9 wherein the bypass means outlet is movable to direct the recirculated liquid in different directions.
11. An arrangement according to claim 5, 6 or 7, wherein the valve is a turnable two-way valve.
12. An automatic liquid recirculation arrangement for a waste water pumping station substantially as described with reference to the accompanying drawings.
13. A waste water pumping station having a recirculation arrangement substantially as described with reference to the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7908743A SE7908743L (en) | 1979-10-23 | 1979-10-23 | SET AND DEVICE FOR AUTOMATIC CIRCULATION IN DRAINAGE PUMPS |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2060422A true GB2060422A (en) | 1981-05-07 |
GB2060422B GB2060422B (en) | 1983-05-25 |
Family
ID=20339127
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8033082A Expired GB2060422B (en) | 1979-10-23 | 1980-10-14 | Automatic circulation in waste water pumping stations |
Country Status (12)
Country | Link |
---|---|
JP (1) | JPS5666474A (en) |
AR (1) | AR226192A1 (en) |
AU (1) | AU541992B2 (en) |
DE (1) | DE3039216A1 (en) |
DK (1) | DK446580A (en) |
FI (1) | FI802414A (en) |
FR (1) | FR2467922A1 (en) |
GB (1) | GB2060422B (en) |
IT (1) | IT1193560B (en) |
NL (1) | NL8005675A (en) |
NO (1) | NO803100L (en) |
SE (1) | SE7908743L (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0058648A1 (en) * | 1981-02-10 | 1982-08-25 | Flygt AB | A device for automatic circulation in sewage water pump station |
GB2277557A (en) * | 1993-04-27 | 1994-11-02 | Stephen Walker Tebby | Sewage pumping stations and pump apparatus |
WO1995030060A1 (en) * | 1994-04-30 | 1995-11-09 | A B S Pumps Ltd. | Flush valve |
FR2763518A1 (en) * | 1997-05-26 | 1998-11-27 | Id O Concept | PLANT FOR THE TREATMENT OF FLUIDS SUCH AS BREEDING WATER FOR ANIMALS |
WO1999054565A1 (en) * | 1998-04-22 | 1999-10-28 | Szuster Mirosdaw | A method and a device for automatic circulation in waste water tank |
WO2006069772A1 (en) * | 2004-12-28 | 2006-07-06 | Uws United Water Systems Gmbh | Pumping station for the transport of liquids |
WO2008057033A1 (en) * | 2006-11-07 | 2008-05-15 | Itt Manufacturing Enterprises Inc | A pump system and a discharge pipe as well as a method for separating solids from a liquid |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3333883A1 (en) * | 1983-09-20 | 1985-03-28 | Willi 4973 Vlotho Cordes | Tank for a sewage pumping station |
JPS6365196A (en) * | 1986-09-05 | 1988-03-23 | Chiyuuden Gijutsu Consultant Kk | Pumping equipment by pump stage tank |
SE461993B (en) * | 1988-09-13 | 1990-04-23 | Flygt Ab | DEVICE FOR ACHIEVING AID AIR CIRCULATION IN WASTEWATER PUMP STATIONS |
SE463218B (en) * | 1989-02-21 | 1990-10-22 | Flygt Ab | SETTING AND DEVICE FOR AUTHORIZATION OF AATER CIRCULATION IN WASTEWATER PUMP STATIONS |
AU634778B2 (en) * | 1989-05-19 | 1993-03-04 | Adrian Seeley | Improvements relating to precast sewage pumping chambers |
SE9002711D0 (en) * | 1990-08-21 | 1990-08-21 | Flygt Ab | DEVICE FOR ACHIEVING CIRCULATION IN PUMP STATIONS |
DE4330838C2 (en) * | 1993-09-11 | 1997-02-27 | Fass Werner | Pump station for liquids |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE230861C (en) * | ||||
SE366013B (en) * | 1973-06-25 | 1974-04-08 | Stenberg Flygt Ab | |
JPS5122042A (en) * | 1974-08-20 | 1976-02-21 | Kawamura Denki Sangyo | RODEN SHADANKI |
US3957633A (en) * | 1974-09-19 | 1976-05-18 | Itt Industries, Inc. | Sewage treatment method and apparatus |
JPS51151804A (en) * | 1975-06-20 | 1976-12-27 | Kyokuto Kikai Seisakusho:Kk | Water supply system |
DE2544223C3 (en) * | 1975-10-03 | 1979-06-07 | Peter 4044 Kaarst Cremer | Lifting device for sewage mixed with thick matter |
DE2558654A1 (en) * | 1975-12-30 | 1977-07-14 | Kaiserslautern Guss Armatur | Sewage pump for underground collection chamber - has removal port in chamber wall below second port for pump pressure inlet |
-
1979
- 1979-10-23 SE SE7908743A patent/SE7908743L/en not_active Application Discontinuation
-
1980
- 1980-08-01 FI FI802414A patent/FI802414A/en not_active Application Discontinuation
- 1980-10-09 FR FR8021568A patent/FR2467922A1/en active Granted
- 1980-10-14 GB GB8033082A patent/GB2060422B/en not_active Expired
- 1980-10-15 NL NL8005675A patent/NL8005675A/en not_active Application Discontinuation
- 1980-10-17 NO NO803100A patent/NO803100L/en unknown
- 1980-10-17 DE DE19803039216 patent/DE3039216A1/en not_active Withdrawn
- 1980-10-17 AU AU63480/80A patent/AU541992B2/en not_active Ceased
- 1980-10-20 AR AR282948A patent/AR226192A1/en active
- 1980-10-22 JP JP14700680A patent/JPS5666474A/en active Pending
- 1980-10-22 DK DK446580A patent/DK446580A/en not_active Application Discontinuation
- 1980-10-22 IT IT25494/80A patent/IT1193560B/en active
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0058648A1 (en) * | 1981-02-10 | 1982-08-25 | Flygt AB | A device for automatic circulation in sewage water pump station |
GB2277557A (en) * | 1993-04-27 | 1994-11-02 | Stephen Walker Tebby | Sewage pumping stations and pump apparatus |
GB2277557B (en) * | 1993-04-27 | 1995-11-01 | Stephen Walker Tebby | Sewage pumping stations and pump apparatus |
WO1995030060A1 (en) * | 1994-04-30 | 1995-11-09 | A B S Pumps Ltd. | Flush valve |
FR2763518A1 (en) * | 1997-05-26 | 1998-11-27 | Id O Concept | PLANT FOR THE TREATMENT OF FLUIDS SUCH AS BREEDING WATER FOR ANIMALS |
WO1998053903A1 (en) * | 1997-05-26 | 1998-12-03 | I.D.'o Concept | Installation for treating fluids |
WO1999054565A1 (en) * | 1998-04-22 | 1999-10-28 | Szuster Mirosdaw | A method and a device for automatic circulation in waste water tank |
WO2006069772A1 (en) * | 2004-12-28 | 2006-07-06 | Uws United Water Systems Gmbh | Pumping station for the transport of liquids |
WO2008057033A1 (en) * | 2006-11-07 | 2008-05-15 | Itt Manufacturing Enterprises Inc | A pump system and a discharge pipe as well as a method for separating solids from a liquid |
Also Published As
Publication number | Publication date |
---|---|
IT8025494A0 (en) | 1980-10-22 |
IT1193560B (en) | 1988-07-08 |
DE3039216A1 (en) | 1981-04-30 |
DK446580A (en) | 1981-04-24 |
JPS5666474A (en) | 1981-06-04 |
NL8005675A (en) | 1981-04-27 |
FR2467922A1 (en) | 1981-04-30 |
FI802414A (en) | 1981-04-24 |
NO803100L (en) | 1981-04-24 |
GB2060422B (en) | 1983-05-25 |
AR226192A1 (en) | 1982-06-15 |
FR2467922B1 (en) | 1984-09-21 |
SE7908743L (en) | 1981-04-24 |
AU6348080A (en) | 1981-04-30 |
AU541992B2 (en) | 1985-01-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19981014 |