IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0988667
(2009-04-23)
|
등록번호 |
US-8580115
(2013-11-12)
|
우선권정보 |
DE-10 2008 021 190 (2008-04-29) |
국제출원번호 |
PCT/EP2009/002944
(2009-04-23)
|
§371/§102 date |
20101020
(20101020)
|
국제공개번호 |
WO2009/132797
(2009-11-05)
|
발명자
/ 주소 |
- Krause, Stefan
- Voigt, Reinhard
- Cornel, Peter
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
0 |
초록
▼
A method of cleaning filtration modules for the treatment of raw water, or wastewater, or activated sludge, is provided by circulating particles in untreated water. The deposits located on the filter membrane outer surfaces are removed by the mechanical action of the particles, without significantly
A method of cleaning filtration modules for the treatment of raw water, or wastewater, or activated sludge, is provided by circulating particles in untreated water. The deposits located on the filter membrane outer surfaces are removed by the mechanical action of the particles, without significantly damaging the membrane. Initially, untreated water, wastewater, or activated sludge is chemically-mechanically pretreated. Then the untreated water or wastewater polluted with biologically active material is discharged into a membrane bioreactor system having a filtration unit including at least one filtration tank. At least one submerged filtration membrane module is present in the filtration tank. The untreated water or wastewater in this filtration tank is filled with particles and circulates inside the filtration tank. The particles are non-porous, biologically resistant polymer particles. Alternatively, a cleaning tank including a circulating fluid containing particles may be provided for the temporary accommodation of the filtration module.
대표청구항
▼
1. A method for cleaning raw water or wastewater or activated sludge filtration membrane modules, comprising introducing the filtration membrane module to be cleaned into a cleaning tank or arranging the filtration membrane module in a filtration tank,flushing the filtration membrane module with a l
1. A method for cleaning raw water or wastewater or activated sludge filtration membrane modules, comprising introducing the filtration membrane module to be cleaned into a cleaning tank or arranging the filtration membrane module in a filtration tank,flushing the filtration membrane module with a liquid containing non-porous biologically resistant particles that have been set in circulation by introducing gas,wherein deposits situated on outer surfaces of the membranes of the filtration membrane module are mechanically eroded by the particles, andthe particles have a median surface roughness Rtm of less than 40 μm. 2. The method as claimed in claim 1, wherein the method further comprises treating raw water or wastewater or activated sludge, said treatment comprising the steps: mechanically, and chemically pretreating the raw water or wastewater or activated sludge,introducing the pretreated raw water or wastewater contaminated with biologically active material into a membrane bioreactor system having one or more filtration tanks, said filtration tank having at least one submerged filtration membrane module arranged therein,charging the raw water or wastewater or the activated sludge in the filtration tank with circulating particles andtaking off the water purified by the biologically active material. 3. The method as claimed in claim 1, wherein the gas introduction induces an upward movement in the particles that circulate within the cleaning or filtration tank and gravity effects a downward movement in the particles that circulate within the cleaning or filtration tank. 4. The method as claimed in claim 1, wherein the non-porous particles consist of inert polymeric material having a density of 1.0 to 1.5 kg/dm3. 5. The method as claimed in claim 4, wherein the density of the polymeric material is 1.0 to 1.1 kg/dm3. 6. The method as claimed in claim 4, wherein the polymeric material is selected from the group consisting of mineral-filled polypropylene, polycarbonate blends, thermoplastic polyurethane elastomers, poly(methyl methacrylate), poly(butylene tereph(halate), polyoxymethylene, polyethylene, and poly(vinyl chloride). 7. The method as claimed in claim 6, wherein the polymeric material is mineral-filled polypropylene. 8. The method as claimed in claim 6, wherein the polymeric material is poly(methyl methacrylate). 9. The method as claimed in claim 1, wherein the particles have a median diameter of less than 5 mm. 10. The method as claimed in claim 9, wherein the particles have a median diameter in the range from 1.5 to 3.5 mm. 11. The method as claimed in claim 9, wherein the particles have a median diameter of from 2.5 to 3.5 mm. 12. The method as claimed in claim 1, wherein the particles have a spherical, cylindrical or lenticular shape. 13. The method as claimed in claim 2, wherein particles are added at a concentration from 1 to 5 kg per m3 to raw water or wastewater that is to be purified or activated sludge volume in the filtration tank. 14. The method as claimed in claim 2, wherein the activated sludge concentration DM is up to 20 g/l. 15. The method as claimed in claim 1, wherein a maximum specific area loading of the membranes in the filtration membrane module is set in the range from 1 l/(m2×h) to 80 l/(m2×h). 16. A membrane bioreactor system for treating raw water or wastewater or activated sludge having a filtration tank in which at least one submerged filtration membrane module is situated in the filtration tank, wherein the raw water or wastewater or the activated sludge in the filtration tank contains non-porous, biologically resistant particles, and the particles have a median surface roughness Rtm of less than 40 μm. 17. The membrane bioreactor system as claimed in claim 16, wherein the filtration membrane module comprises membranes having a spacing between two membranes of up to 8 mm and a median diameter of the particles of less than 5 mm. 18. The membrane bioreactor system as claimed in claim 16, wherein the particles consist of a polymeric material having a density from 1.0 to 1.5 kg/dm3 and the polymeric material is selected from the group consisting of mineral-filled polypropylene, polycarbonate blends, thermoplastic polyurethane elastomers, poly(methyl methacrylate), poly(butylene terephthalate), polyoxymethylene, polyethylene, and poly(vinyl chloride). 19. The membrane bioreactor system as claimed in claim 16, wherein a feed device for gas is provided for the bottom end of the filtration membrane module, and the gas streaming moves the particles upward between the membranes. 20. The membrane bioreactor system as claimed in claim 16, wherein the maximum specific area loading of the membranes in the filtration membrane module is 1 to 80 l/(m2×h). 21. A membrane bioreactor system as claimed in claim 16, wherein said particles circulate at a concentration from 1 to 10 kg/m3 in the filtration tank. 22. A membrane bioreactor system as claimed in claim 21, wherein said circulating particles are made of high-strength, low-abrasion, inert, non-porous polymeric materials. 23. A cleaning container for cleaning filtration membrane modules of membrane bioreactor systems, said cleaning container comprising particles consisting of inert polymeric material having a density of 1.0 to 1.5 kg/dm3 circulating at a concentration of 1 to 10 kg/m3 in water with air injection, said particles having a median surface roughness Rtm of less than 40 μm. 24. The method as claimed in claim 3, wherein the gas is compressed air. 25. The method as claimed in claim 1, wherein the particles have a median surface roughness Rtm of less than 30 μm. 26. The method as claimed in claim 25, wherein the particles have a median surface roughness Rtm of less than 20 μm. 27. The membrane bioreactor system as claimed in claim 16, wherein the particles have a median surface roughness Rtm of less than 30 μm. 28. The membrane bioreactor system as claimed in claim 27, wherein the particles have a median surface roughness Rtm of less than 20 μm. 29. A membrane bioreactor system for treating raw water or wastewater or activated sludge having a filtration tank in which at least one submerged filtration membrane module is situated in the filtration tank, wherein the raw water or wastewater or the activated sludge in the filtration tank contains non-porous, biologically resistant particles, a feed device for gas is provided for the bottom end of the filtration membrane module, the gas streaming moves the particles upward between the membranes, and the gas is compressed air.
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