Patents
Patents for C02F - Treatment of water, waste water, sewage, or sludge (726)
01/1993
01/12/1993US5178774 Dissolving and coagulation of diallyldimethylammonium chloride polymer
12/1992
12/22/1992CA1311717C Effluent treatment
12/09/1992EP0238639B1 Method of treating fluids
11/1992
11/11/1992CN1019003B Devices for treating water containing calcium carbonate and installation consisting of these device
11/03/1992US5160620 Method and apparatus for treating water
08/1992
08/05/1992EP0471784A4 Method and composition for treating waste water
08/05/1992CA2060586A1 Device that demineralizes water by magnetization
07/1992
07/15/1992EP0283509B1 The control of biofouling in aqueous systems by non-polymeric quaternary ammonium polyhalides
06/1992
06/24/1992EP0279849B1 A process for cleaning chlorinated water and an apparatus for carrying out the process
06/09/1992US5120453 Oxidative removal of cyanide from aqueous streams
05/1992
05/06/1992EP0483290A1 Immersible biological filter for the purification of waste water.
02/1992
02/26/1992EP0471784A1 Method and composition for treating waste water.
02/19/1992EP0318483B1 Method and apparatus for electrolytic treatment of liquids, especially waste water
01/1992
01/09/1992WO1992000247A1 Purification of aqueous liquor
08/1991
08/21/1991EP0336929B1 Method for water purification
08/13/1991US5039414 Process for separating and/or recovering hydrocarbon oils from water using biodegradable absorbent sponges
07/1991
07/24/1991WO1991011396A1 Method and reactor for purification of water
07/16/1991CA1286325C Hazardous waste reactor system
07/10/1991EP0435944A1 Water purifying system
06/1991
06/11/1991US5022974 Method and apparatus for electrolytic treatment of liquids, especially waste water
05/1991
05/14/1991US5015448 Particulate material suitable for selectively separating metal cations from aqueous solutions, process for its production, and use thereof
02/1991
02/21/1991DE4024191A1 Concrete oil-water sepn. container with end bulges - holding integral inlet and outlet bores respectively for raw and treated water
02/07/1991WO1991001279A1 Immersible biological filter for the purification of waste water
02/06/1991EP0410961A1 A method and an apparatus for separating solid particles from a liquid.
02/03/1991CA2007615A1 Method of improving the quality of large amount of water and the quantity of dissolved oxygen therein, and apparatus for said improvement
02/02/1991WO1991001945A1 Process for separating and/or recovering hydrocarbon oils from water using biodegradable absorbent sponges
02/02/1991CA2037925A1 Process for separating and/or recovering hydrocarbon oils from water using biodegradable absorbent sponges
01/1991
01/16/1991EP0408545A1 Process for immobilizing harmful substances and/or for making them inert
01/15/1991WO1991001280A1 Process for rendering inert and/or immobilizing environmentally harmful substances
01/15/1991CA2063395A1 Process for rendering inert and/or immobilizing enviromentally harmful substances
12/1990
12/09/1990CA2060508A1 Removal of contaminants
11/1990
11/13/1990CA1276359C Semi-permeable membrane of sulphonated polyarylether sulphones
11/10/1990WO1990013519A1 Method and composition for treating waste water
10/1990
10/31/1990EP0309474B1 Process and device for large surface-area fine-bubble gasification of liquids
10/24/1990EP0325596A4 Hazardous waste reactor system
09/1990
09/25/1990CA1274441A1 Hydrated calcium hypochlorite tablets containing lime compounds as lubricants and solubility retardants
08/1990
08/29/1990EP0218608B1 Low-foaming compositions
06/1990
06/14/1990WO1990006288A1 Method and apparatus for treating water
06/13/1990EP0372132A1 Small-pored crystalline titanium molecular sieve zeolites
05/1990
05/08/1990US4923614 Process and device for large surface-area fine-bubble gasification of liquids
05/02/1990EP0215013B1 Magnetic conditioning of hard water
04/1990
04/05/1990WO1990003333A1 Water purifying system
03/1990
03/28/1990EP0360612A1 Water purifying system
03/14/1990EP0167569B1 Deoxygenation process and apparatus
03/07/1990EP0282476B1 Process and device for treating an aqueous liquid
10/1989
10/18/1989EP0336929A1 Method for water purification.
10/17/1989US4874587 Vapor phase decomposing organic compounds with water
08/1989
08/02/1989EP0325596A1 Hazardous waste reactor system.
07/1989
07/04/1989CA1256822A1 Water conditioning device containing calcium carbonate, and installation including said device
06/1989
06/07/1989EP0318483A1 Method and apparatus for electrolytic treatment of liquids, especially waste water.
05/1989
05/18/1989DE3836138A1 Particulate medium suitable for the selective separation of metal cations from aqueous solutions, process for the production thereof and use thereof
05/03/1989EP0314026A1 Particle agent for the selective removal of metal cations from aqueous solutions, process for its production and its use
04/1989
04/12/1989EP0283509A4 The control of biofouling in aqueous systems by non-polymeric quaternary ammonium polyhalides.
04/04/1989US4818345 Distillation apparatus
03/1989
03/08/1989EP0305606A1 Back-wash filter assembly
01/1989
01/10/1989CA1248645A1 Deoxygenation process and apparatus
12/1988
12/12/1988EP0238639A4 Method of treating fluids.
11/1988
11/17/1988EP0229150B1 Apparatus for desalinating salt water by membrane distillation
10/1988
10/26/1988CN87102687A Water treatment process and products
09/1988
09/28/1988EP0283509A1 The control of biofouling in aqueous systems by non-polymeric quaternary ammonium polyhalides.
09/21/1988EP0282476A1 Process and device for treating an aqueous liquid.
09/20/1988US4772387 Fluid circulates in space between two concentric tubes through permanent magnetic field
09/20/1988US4772369 Demineralization
08/1988
08/31/1988EP0279849A1 A process for cleaning chlorinated water and an apparatus for carrying out the process.
06/1988
06/21/1988US4752363 Adding alkali metal hydroxide, filtration and electrolysis
05/1988
05/19/1988WO1988003515A1 Method for water purification
03/1988
03/30/1988CN87106273A Hazardous waste reactor system
03/16/1988EP0259525A1 Water treatment method and product
03/10/1988WO1988001711A1 Hazardous waste reactor system
03/01/1988US4728397 Apparatus for desalinating salt water by membrane distillation
01/1988
01/26/1988CA1231914A1 System for diaphragm distillation
01/12/1988US4718985 System for diaphragm distillation
01/07/1988EP0251691A2 Effluent treatment
12/1987
12/17/1987WO1987007590A1 Process and device for large surface-area fine-bubble gasification of liquids
12/03/1987WO1987007175A1 Sludge scraper mechanism for settling tanks in sewage treatment plants
09/1987
09/30/1987EP0238639A1 Method of treating fluids.
08/1987
08/27/1987WO1987005005A1 A method and an apparatus for separating solid particles from a liquid
07/1987
07/30/1987WO1987004422A1 Process and device for treating an aqueous liquid
07/22/1987EP0229150A1 Apparatus for desalinating salt water by membrane distillation.
07/09/1987EP0218608A4 Low-foaming compositions.
07/08/1987EP0227733A1 A distillation apparatus
07/01/1987CN86108307A Method for the treatment of impure water
04/1987
04/22/1987EP0218608A1 Low-foaming compositions.
04/10/1987EP0167569A4 Deoxygenation process and apparatus.
03/1987
03/26/1987WO1987001688A1 Method of treating fluids
03/25/1987EP0215013A1 Magnetic conditioning of hard water.
01/1987
01/15/1987WO1987000160A1 Apparatus for desalinating salt water by membrane distillation
12/1986
12/31/1986WO1986007585A1 A distillation apparatus
09/1986
09/25/1986WO1986005510A1 Low-foaming compositions
09/10/1986CN86101249A Devices for treating water containing calcium carbonate and installation consisting of these devices
08/1986
08/28/1986WO1986004887A1 Magnetic conditioning of hard water
08/27/1986EP0191818A1 Electromagnetic treatment of water
04/1986
04/22/1986CA1203488A1 Desalination device and process
04/02/1986EP0175956A2 Sand filter media and an improved method of purifying water
03/1986
03/13/1986WO1986001496A1 Electromagnetic treatment of water
01/1986
01/22/1986EP0168538A1 Clarifier
01/15/1986EP0167569A1 Deoxygenation process and apparatus.
01/03/1986WO1986000026A1 System for diaphragm distillation
12/1985
12/11/1985EP0164326A2 System for diaphragm distillation
12/04/1985EP0162904A1 Clarifier
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