CA1118123A - Method and arrangement for treatment of sludge water - Google Patents
Method and arrangement for treatment of sludge waterInfo
- Publication number
- CA1118123A CA1118123A CA000312444A CA312444A CA1118123A CA 1118123 A CA1118123 A CA 1118123A CA 000312444 A CA000312444 A CA 000312444A CA 312444 A CA312444 A CA 312444A CA 1118123 A CA1118123 A CA 1118123A
- Authority
- CA
- Canada
- Prior art keywords
- sludge
- tank
- water
- purified water
- collecting tank
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/008—Mobile apparatus and plants, e.g. mounted on a vehicle
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F7/00—Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools
- E03F7/10—Wheeled apparatus for emptying sewers or cesspools
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Sewage (AREA)
Abstract
Abstract of the Disclosure A method and apparatus for the treatment of sludge water contents in waste water wells wherein the sludge water is transferred to a collecting tank, treated with chemicals, separated into sludge and purified water and the purified water removed and simultaneously, subjecting the remaining sludge to floccing and/or sedimentation.
Description
lZ3 ~ethod and arrangement for treatment of sludge water The present invention relates to a method and an arrangement for treatment of the sludge water contents in waste water purification arrangements of moderate size, such as waste water wells, b,y means of a mobile ~lant.
Small purification arrangements for ~urification of waste water ' from one or a few residential houses include sludge separators such as two or three waste water wells connected in series.
To secure proper operation it is necessary frequently to remove the sludge accumulated in the waste water wells. Thereby, the whole sludge water contents of the well is removed and trans~orted to a central purification plant for treatment. Thus, compara-tively long trans~orts are necessary. Further, the central ~urification plants must be capahle of treating considerable amounts of sludge water.
The aim of the present invention is to provide an improved method and arrangement for treatment of the sludge water, where less trans~ortation is reauired, and where there is a little need of central purification plants. This is obtained h,~ the method and arrangement defined in the claims.
The invention is further described below with reference to the drawings, in which Fig 1 and 2 are side views of an emhodiment of the invention;
Fig 3 is a detail view alon~ the dotted lines A - - A in Fig. l;
Fig 4 is a simplified schematic diagram of the emhodiment of Fig. l; and Fig 5 is a schematic illustration of o~eration stens included in a full operation cycle.
The mobile sludge water treatment plant disclosed in Fig 1 is arranged on truck chassis. It includes a collecting tank 1 having room for 5 m3 of sludge water, whereby it is possible
Small purification arrangements for ~urification of waste water ' from one or a few residential houses include sludge separators such as two or three waste water wells connected in series.
To secure proper operation it is necessary frequently to remove the sludge accumulated in the waste water wells. Thereby, the whole sludge water contents of the well is removed and trans~orted to a central purification plant for treatment. Thus, compara-tively long trans~orts are necessary. Further, the central ~urification plants must be capahle of treating considerable amounts of sludge water.
The aim of the present invention is to provide an improved method and arrangement for treatment of the sludge water, where less trans~ortation is reauired, and where there is a little need of central purification plants. This is obtained h,~ the method and arrangement defined in the claims.
The invention is further described below with reference to the drawings, in which Fig 1 and 2 are side views of an emhodiment of the invention;
Fig 3 is a detail view alon~ the dotted lines A - - A in Fig. l;
Fig 4 is a simplified schematic diagram of the emhodiment of Fig. l; and Fig 5 is a schematic illustration of o~eration stens included in a full operation cycle.
The mobile sludge water treatment plant disclosed in Fig 1 is arranged on truck chassis. It includes a collecting tank 1 having room for 5 m3 of sludge water, whereby it is possible
2 9~ 123 to treat the total contents of most waste water wells as a single batch. The collecting tank 1 is arranged together with a purified water tank 15 in a common container, which is divided into two cavities by an internal senarating wall having the shape of several cones, the u~Per cavity forming said collecting tank 1 and the lower cavit~ formin~ said purified water tank 15. The volume of the lower cavity is almost the same as that of the upper cavity. The conical shape of the separating wall facilitates sedimentation of the treated sludge water and discharge of the contents of the collecting tank 1. Through a valve 22 (Fi~ 3) the collecting tank 1 is connectable to a ~ipe 2, which is connected to a hose 10 arranged on a hose reel (11). The purified water tank 15 is connectable to the pioe 2 th~ough a valve 23 (Fig 3). The pipe 2 and the hose 10 are used both for sludge water inlet and for purified water outlet. Through a portioning means 3 a chemicals container 4 is connected to the ~ipe 2.
An arrangement 5 for providing turhulent flow is provided in the pipe 2 between the portioning means 3 and the collecting tank 1.
The lower part of t~e collecting tank 1 is connected to a pipe 9, which is coupled to a sediment tank 6 through a valve 8. The lower end of the sediment tank 6 is connected through a valve 12 and a pipe 13 to a de-watering means 7, com~rising a drum-type vacuumfilter arranged in a vessel 14 (Fig 4). The sludge level in the vessel is controlled by a l~vel sensor 39 (Fig 4) activating the valve 12 to o~en or to close. Below the de-watering means 7 a sludge container 18 is arranged in such a position that de-watered sludge from the vacuumfilter falls down into the sludge container 18. A
hydraulic cylinder 20 operates a discharge door 19 arranged at the lower end of the container 18. The inner part of the drum-type vacuumfilter is connected to the purified water tank 15 through a valve 17 and a pi~e 16.
lll~lZ3 The ~ower is delivered b~ a niesel engine 21 which drives a h~draulic oump and an electric;ty generator.
Trans~ortation of water and sludge within the plant is accomplished by applying different pressure in the various tan~s and containers. The oressure and vacuum systems are shown in Fig 4, which is a simolified diagra~ where the sediment tank 6 has been omitted.
A vacuum pump 24 is connected through a moisture separator 25 to a pipe 28, which is connectable to the collecting tank 1 and the purified water tank 15 by means of valves 30 and 31, respectively. A com~ressor 25 is connected through a Pressure air tank 27 to a pipe 29, which is connectable to the collecting tank 1, the purified water tank 15 and the de-watering means 7 by means of valves 32, 33 and 34, respectively. In series with the valves 32 and 33 regulating valves 35 and 36, respectively, are connected. When a sediment tank is orovided, it is connected in a similar matter as the tanks 1 and 15. Level sensors 37, 38 and 39 are provided in the collectin~ tank 1 and the de--watering ~eans vessel 14, res~ectively. The de-waterin~ means 7 and the hose reel are driven by h~draulic motors 40 and 41, respectively. A protection valve 41' is connected between the pioe 2 and the portioning means 3 to orevent water in the pipe 2 from entering into the nortioning means 3.
The operation o~ the ~lant is described below with reference to Fig 4.
The hose 10 is unwound from the reel 11 and brough~down into the waste water well to be breated. The vacuum pum~ 24 is connected to the collecting tank 1, and the slud~e water is sucked through the hose 10 and the oioe 2 into the tank 1, while the oortioning means 3 delivers chemicals from the chemic-al container 4 into the sludge water. ~hen passing the turhulent flow arrangement 5 the chemicals and the sludge water are thoroughly mixed. When all the sludge water in the waste water well has been moved into the collecting tank 1, the valve 22 is closed and the floccing process begins in that tank. During that process, the contents in the ~urlfied water tank 15, which emanates from the treatment o~ the previous waste water well, is exhausted into the empty waste water well now being treated. This is accomp-lished by the opening~of the valves 23 and 33, whereby the water is pressed through the pipe 2 and the hose ln, the end of which still being situated in the waste water well.
Then, the valve 22 is closed, the valve 12 is opened and the pressure in the collecting tank 1 is increased by opening the valve 32, whereby flocced sludge water is flowing throu~h the pipe 13 into the vessel 14 of the de-watering means 7. The de-watering ~rocess beings as the valve 17 is opened, and the pressure in the purified water tank 15 is decreased by o~ening the valve 31, wherebv purified water is transported through the pipe 16 into the tank 15 while de-watered sludge falls down into the sludge container 18. Sludge sticking onto the vacuumfilter is released by applying pressure air blows from the Pressure air system.
When the de-~atering starts, the hose 10 is reeled onto the hose reel 11 and the ~lant is moved to the next waste water well in turn to be treated. The de-watering continues during transportation until all the sludge has been de-watered.
When required a separate sedimentation steo of the flocced sludge water in the collecting tank 1 is included in the process. Then, the sediment tank 6 is used in a manner shown in Fig 5, which illustrates five consecutive treatment ste~s together forming a~ull plant operation cycle.
Step 1 includes removin~ the waste water well contents into the collecting tank 1 while adding chemicals as has previously been described. Then, the valve 22 is closed and step 2 begins.
5 ~ 123 In step 2 the slud~e water in t,he tank 1 is flocculating and sedimenting to the bottom of the tank. Simultaneousl~, ~urified water is removed from the tank 15 into the well as has oreviously been described. When the sedimentation process is slowing down in the tank 1 (after apDrox. 1~
minutes when calcium-hydroxide or iron chloride is used), step 3 begins.
In step 3 the tank 1 is connected to the pressure air tank 27 and the valve 8 is opened. As soon as sediment is transported from the tank 1 into the sediment tank 6 through the pi~e 9, the valve 12 on the pipe 13 is oDened, whereby the vessel 14 ln the de-watering means 7 is connected to the sediment tank 6 and sediment is transported into the vessel 14.
Thereby, the de-waterin~ means 7 begins to o~erate, the valve 17 is opened and the air pressure in the purified water tank 15 is reduced by connecting the tank 15 to the vacuum source 24. When all sediment in the tank 1 has been transported into the sediment tank 6, the valve 8 is closed.
The tank 1 now contains water which has been clarified during the sedimentation process. Com~ared with the sludge water this clarified water contains only a small fraction of impurities.
In step 4, the clarified water contents of the tank 1 is removed into the waste water well as the valve 22 is opened.
Simultaneously, de-watering of the sludge sediment continues.
In step 5, the hose 1~ is reeled onto the hose reel 11 ana the mobile plant is transported to the next waste water well to be~treated. Durin~ trans~ortation, the de-watering of the sludge sediment continues until all sediment has been treated.
When arriving at the next waste water well to be treated, a full nlant operation c~cle has been com~leted and the plant is ready to repeat the process.
The sludge collected in the sludge container 18 is removed through the discharge door 19 when several waste water wells have been treated. Such de-watered ~lud~e is transoorted to suitable receiving olants.
` :
An arrangement 5 for providing turhulent flow is provided in the pipe 2 between the portioning means 3 and the collecting tank 1.
The lower part of t~e collecting tank 1 is connected to a pipe 9, which is coupled to a sediment tank 6 through a valve 8. The lower end of the sediment tank 6 is connected through a valve 12 and a pipe 13 to a de-watering means 7, com~rising a drum-type vacuumfilter arranged in a vessel 14 (Fig 4). The sludge level in the vessel is controlled by a l~vel sensor 39 (Fig 4) activating the valve 12 to o~en or to close. Below the de-watering means 7 a sludge container 18 is arranged in such a position that de-watered sludge from the vacuumfilter falls down into the sludge container 18. A
hydraulic cylinder 20 operates a discharge door 19 arranged at the lower end of the container 18. The inner part of the drum-type vacuumfilter is connected to the purified water tank 15 through a valve 17 and a pi~e 16.
lll~lZ3 The ~ower is delivered b~ a niesel engine 21 which drives a h~draulic oump and an electric;ty generator.
Trans~ortation of water and sludge within the plant is accomplished by applying different pressure in the various tan~s and containers. The oressure and vacuum systems are shown in Fig 4, which is a simolified diagra~ where the sediment tank 6 has been omitted.
A vacuum pump 24 is connected through a moisture separator 25 to a pipe 28, which is connectable to the collecting tank 1 and the purified water tank 15 by means of valves 30 and 31, respectively. A com~ressor 25 is connected through a Pressure air tank 27 to a pipe 29, which is connectable to the collecting tank 1, the purified water tank 15 and the de-watering means 7 by means of valves 32, 33 and 34, respectively. In series with the valves 32 and 33 regulating valves 35 and 36, respectively, are connected. When a sediment tank is orovided, it is connected in a similar matter as the tanks 1 and 15. Level sensors 37, 38 and 39 are provided in the collectin~ tank 1 and the de--watering ~eans vessel 14, res~ectively. The de-waterin~ means 7 and the hose reel are driven by h~draulic motors 40 and 41, respectively. A protection valve 41' is connected between the pioe 2 and the portioning means 3 to orevent water in the pipe 2 from entering into the nortioning means 3.
The operation o~ the ~lant is described below with reference to Fig 4.
The hose 10 is unwound from the reel 11 and brough~down into the waste water well to be breated. The vacuum pum~ 24 is connected to the collecting tank 1, and the slud~e water is sucked through the hose 10 and the oioe 2 into the tank 1, while the oortioning means 3 delivers chemicals from the chemic-al container 4 into the sludge water. ~hen passing the turhulent flow arrangement 5 the chemicals and the sludge water are thoroughly mixed. When all the sludge water in the waste water well has been moved into the collecting tank 1, the valve 22 is closed and the floccing process begins in that tank. During that process, the contents in the ~urlfied water tank 15, which emanates from the treatment o~ the previous waste water well, is exhausted into the empty waste water well now being treated. This is accomp-lished by the opening~of the valves 23 and 33, whereby the water is pressed through the pipe 2 and the hose ln, the end of which still being situated in the waste water well.
Then, the valve 22 is closed, the valve 12 is opened and the pressure in the collecting tank 1 is increased by opening the valve 32, whereby flocced sludge water is flowing throu~h the pipe 13 into the vessel 14 of the de-watering means 7. The de-watering ~rocess beings as the valve 17 is opened, and the pressure in the purified water tank 15 is decreased by o~ening the valve 31, wherebv purified water is transported through the pipe 16 into the tank 15 while de-watered sludge falls down into the sludge container 18. Sludge sticking onto the vacuumfilter is released by applying pressure air blows from the Pressure air system.
When the de-~atering starts, the hose 10 is reeled onto the hose reel 11 and the ~lant is moved to the next waste water well in turn to be treated. The de-watering continues during transportation until all the sludge has been de-watered.
When required a separate sedimentation steo of the flocced sludge water in the collecting tank 1 is included in the process. Then, the sediment tank 6 is used in a manner shown in Fig 5, which illustrates five consecutive treatment ste~s together forming a~ull plant operation cycle.
Step 1 includes removin~ the waste water well contents into the collecting tank 1 while adding chemicals as has previously been described. Then, the valve 22 is closed and step 2 begins.
5 ~ 123 In step 2 the slud~e water in t,he tank 1 is flocculating and sedimenting to the bottom of the tank. Simultaneousl~, ~urified water is removed from the tank 15 into the well as has oreviously been described. When the sedimentation process is slowing down in the tank 1 (after apDrox. 1~
minutes when calcium-hydroxide or iron chloride is used), step 3 begins.
In step 3 the tank 1 is connected to the pressure air tank 27 and the valve 8 is opened. As soon as sediment is transported from the tank 1 into the sediment tank 6 through the pi~e 9, the valve 12 on the pipe 13 is oDened, whereby the vessel 14 ln the de-watering means 7 is connected to the sediment tank 6 and sediment is transported into the vessel 14.
Thereby, the de-waterin~ means 7 begins to o~erate, the valve 17 is opened and the air pressure in the purified water tank 15 is reduced by connecting the tank 15 to the vacuum source 24. When all sediment in the tank 1 has been transported into the sediment tank 6, the valve 8 is closed.
The tank 1 now contains water which has been clarified during the sedimentation process. Com~ared with the sludge water this clarified water contains only a small fraction of impurities.
In step 4, the clarified water contents of the tank 1 is removed into the waste water well as the valve 22 is opened.
Simultaneously, de-watering of the sludge sediment continues.
In step 5, the hose 1~ is reeled onto the hose reel 11 ana the mobile plant is transported to the next waste water well to be~treated. Durin~ trans~ortation, the de-watering of the sludge sediment continues until all sediment has been treated.
When arriving at the next waste water well to be treated, a full nlant operation c~cle has been com~leted and the plant is ready to repeat the process.
The sludge collected in the sludge container 18 is removed through the discharge door 19 when several waste water wells have been treated. Such de-watered ~lud~e is transoorted to suitable receiving olants.
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Claims (4)
1. Method for treatment of the sludge water contents in waste water wells by means of a mobile plant, includ-ing the steps of transferring the sludge water contents of the waste water well into a collecting tank in the mobile plant, treating the sludge water with chemicals such as precipitat-ing and sludge stabilizing agents, separating the sludge water into a sludge fraction and a purified water fraction, and removing the purified water from the plant, c h a r a c -t e r i z e d in that the steps required for a treatment form a plant operation cycle including the following steps:
separating and de-watering the chemically treated sludge water or sludge sedimented therefrom in a de-watering means, and collecting de-watered sludge and purified water in a sludge container and a purified water tank, respectively, during transportation of the plant to a next waste water well in turn to be treated, transferring sludge water content of said next waste water well into said collecting tank while adding precipitating agents and, sludge stabilization agents, transferring the purified water collected during the trans-portation of the plant and emmanating from the previous waste water well, into said next waste water well, while simultane-ously the new sludge water in said collecting tank is subject to floculation and, sedimentation.
separating and de-watering the chemically treated sludge water or sludge sedimented therefrom in a de-watering means, and collecting de-watered sludge and purified water in a sludge container and a purified water tank, respectively, during transportation of the plant to a next waste water well in turn to be treated, transferring sludge water content of said next waste water well into said collecting tank while adding precipitating agents and, sludge stabilization agents, transferring the purified water collected during the trans-portation of the plant and emmanating from the previous waste water well, into said next waste water well, while simultane-ously the new sludge water in said collecting tank is subject to floculation and, sedimentation.
2. The method of claim 1 c h a r a c t e r i z e d in that the following steps are further included:
transferring sediment formed in said collecting tank into a sediment tank, wherefrom sediment is fed into said de-watering means, separating said sediment into a sludge fraction and a purified water fraction, and collecting the separated fractions in a sludge container and a purified water tank, respectively, and removing said purified water fraction from said collecting tank back into said waste water well.
transferring sediment formed in said collecting tank into a sediment tank, wherefrom sediment is fed into said de-watering means, separating said sediment into a sludge fraction and a purified water fraction, and collecting the separated fractions in a sludge container and a purified water tank, respectively, and removing said purified water fraction from said collecting tank back into said waste water well.
3. Mobile arrangement for executing the method of claim 1 including a collecting tank connected through a first pipe to a hose, a de-watering means connected to said first pipe through a first valve and further connected to a sludge con-tainer, c h a r a c t e r i z e d by a closed purified water tank connectable to said de-watering means through a second valve and further connectable to said first pipe through a third valve, a vacuum source connectable to said collecting tank through a second pipe and a third valve and further connectable to said purified water tank through said second pipe and a fourth valve, and a pressure air source connectable through a third pipe to said collecting tank, said purified water tank and said de-watering means through further valves.
4. The arrangement of claim 3, further c h a r a c t -e r i z e d a sediment tank connectable to said collecting tank and said de-watering means through further valves.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7710986A SE7710986L (en) | 1977-09-30 | 1977-09-30 | METHOD AND DEVICE FOR TREATMENT OF THE SLUDGE WATER CONTENT IN SEWER WELLS AND DYLIKT |
| SE7710986-6 | 1977-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1118123A true CA1118123A (en) | 1982-02-09 |
Family
ID=20332431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000312444A Expired CA1118123A (en) | 1977-09-30 | 1978-10-02 | Method and arrangement for treatment of sludge water |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5460758A (en) |
| CA (1) | CA1118123A (en) |
| DE (1) | DE2842623A1 (en) |
| FR (1) | FR2404606B1 (en) |
| GB (1) | GB2004859B (en) |
| SE (1) | SE7710986L (en) |
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|---|---|---|---|---|
| US5938918A (en) * | 1997-08-07 | 1999-08-17 | Kidd; William J. | Domestic water clarifier |
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| DE3002557C3 (en) * | 1980-01-25 | 1998-02-05 | Karl Wiedemann | Vehicle for collecting and transporting absorbable waste |
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| JPS58150490A (en) * | 1982-02-27 | 1983-09-07 | Tokyu Car Corp | Vehicle for treating sludgy water in purifying tank or the like |
| JPS58150489A (en) * | 1982-02-27 | 1983-09-07 | Tokyu Car Corp | Vehicle for managing purifying tank |
| JPS596998A (en) * | 1982-07-05 | 1984-01-14 | Tokyu Car Corp | Treatment of sludgy water in purifier tank, etc. and treatment of sludgy water by vehicle for returning filling water |
| JPS597100U (en) * | 1982-07-05 | 1984-01-18 | 東急車輌製造株式会社 | Sludge water treatment vehicle for septic tanks, etc. |
| JPS5912709A (en) * | 1982-07-15 | 1984-01-23 | Tokyu Car Corp | Management of septic tank |
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| DE3233787A1 (en) * | 1982-09-11 | 1984-03-15 | Heiner Dipl.-Ing. 4100 Duisburg Kreyenberg | Settling device for septic sludge |
| JPS59114317U (en) * | 1983-01-24 | 1984-08-02 | トヨタ自動車株式会社 | Front pillar device with snow cover insert |
| JPS59142099U (en) * | 1983-03-11 | 1984-09-22 | 東急車輌製造株式会社 | Sludge water treatment vehicle for septic tanks, etc. |
| DE3411375A1 (en) * | 1984-03-28 | 1985-10-10 | Rittershaus & Blecher Gmbh, 5600 Wuppertal | Sludge dewatering plant |
| FR2564453A1 (en) * | 1984-05-16 | 1985-11-22 | Sitep | MOBILE UNIT FOR PURIFYING POLLUTED WATER AND SLUDGE |
| JPS60257898A (en) * | 1984-06-05 | 1985-12-19 | Arai Seisakusho:Kk | Method and apparatus for removing precipitate in treatment tank such as purification tank |
| JPS60257899A (en) * | 1984-06-05 | 1985-12-19 | Arai Seisakusho:Kk | Apparatus for removing precipitate in treatment tank such as purification tank |
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| JPH0444163Y2 (en) * | 1988-01-28 | 1992-10-19 | ||
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| DE3908216A1 (en) * | 1989-03-14 | 1990-09-20 | Karl Wiedemann | Apparatus for cleaning sewers |
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| CN111574014A (en) * | 2020-06-03 | 2020-08-25 | 铜陵有色金属集团股份有限公司 | Aeration purification method for sludge water discharged from purification plant |
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-
1977
- 1977-09-30 SE SE7710986A patent/SE7710986L/en unknown
-
1978
- 1978-09-29 DE DE19782842623 patent/DE2842623A1/en active Granted
- 1978-09-29 FR FR7828016A patent/FR2404606B1/en not_active Expired
- 1978-09-30 JP JP12112478A patent/JPS5460758A/en active Granted
- 1978-10-02 GB GB7838880A patent/GB2004859B/en not_active Expired
- 1978-10-02 CA CA000312444A patent/CA1118123A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5938918A (en) * | 1997-08-07 | 1999-08-17 | Kidd; William J. | Domestic water clarifier |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2004859B (en) | 1982-05-06 |
| SE7710986L (en) | 1979-03-31 |
| JPS611195B2 (en) | 1986-01-14 |
| DE2842623A1 (en) | 1979-04-12 |
| JPS5460758A (en) | 1979-05-16 |
| FR2404606B1 (en) | 1985-02-01 |
| DE2842623C2 (en) | 1987-08-20 |
| GB2004859A (en) | 1979-04-11 |
| FR2404606A1 (en) | 1979-04-27 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |