| Patents for C02F 9 - Multistep treatment of water, waste water or sewage (41,429) |
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| 10/26/1999 | US5972073 Adding alkaline earth salt to high ph waste water to form group alkaline earth-group v oxyanion salt precipitate and water soluble group iii hydroxide, filtering precipitate, then lowering ph to precipitate out group iii hydroxide |
| 10/20/1999 | CN2344399Y Multi-stage water-purifying device |
| 10/20/1999 | CN2344398Y Multifunctional water-purifying device |
| 10/19/1999 | US5968364 Process for the removal of toxic cyanide and heavy metal species from alkaline solutions |
| 10/19/1999 | CA2212763C Electrolytic hydrogen dissolved water, and method and apparatus for production thereof |
| 10/12/1999 | US5965093 Decontamination system with improved components |
| 10/12/1999 | US5965029 System and method for treating an oil gas well stream |
| 10/07/1999 | WO1999050190A1 Method and device for treating manganese containing water |
| 10/07/1999 | WO1999050184A1 Water treatment system and process comprising ph-adjustment |
| 10/07/1999 | WO1999027972A8 Water sterilization system incorporating ultrasonic device |
| 10/06/1999 | EP0946434A1 Water strainer/purifier and method of using same |
| 10/06/1999 | EP0946422A1 Method for separating organic waste |
| 10/06/1999 | EP0946268A1 Method and apparatus for high efficiency reverse osmosis operation |
| 10/06/1999 | CN2341986Y Mineral water making machine for brewery |
| 10/05/1999 | US5961837 Process for treatment of industrial waste |
| 10/05/1999 | US5961831 Automated closed recirculating aquaculture filtration system and method |
| 10/01/1999 | CA2242192A1 Sewage purification plant |
| 09/30/1999 | WO1999048822A1 Method for precipitating or flocculating substances out of solutions |
| 09/30/1999 | WO1999048821A1 Method for precipitating or flocculating substances contained in solutions |
| 09/30/1999 | WO1999048817A2 Water sanitizing system |
| 09/30/1999 | DE19812605A1 Precipitating heavy metals from e.g. waste water |
| 09/29/1999 | EP0945408A1 Process for removing polyamine chelating agents from aqueous solutions |
| 09/29/1999 | EP0513352B1 Method of cleaning soil water |
| 09/29/1999 | CN2340773Y Water purifier |
| 09/29/1999 | CN2340772Y Ultra-oxidized water purifier |
| 09/28/1999 | US5958252 Comprising waste holding tank, solids-gas processor, aqueous holding tank, and aqueous purifier; for treating human sewage |
| 09/28/1999 | US5958248 Method of precipitating protein at the time of removal of heavy metals |
| 09/28/1999 | US5958247 Method for disposing of a solution containing an organic acid |
| 09/28/1999 | US5958240 System for recycling waste water |
| 09/28/1999 | US5958232 Comprising super precise filter, pressure pump, automatic control system, membrane, pressure tank, post filter and dispenser; durability |
| 09/28/1999 | US5957339 Water filtration system |
| 09/23/1999 | DE19811763A1 Removing arsenic and optionally antimony from suspensions obtained in drinking water production |
| 09/22/1999 | EP0943084A1 Method for monitoring the oxidation of organic compounds in an aqueous medium and implementing device |
| 09/22/1999 | CN2339575Y Disinfecting-sterilizing device of drinking device |
| 09/22/1999 | CN2339574Y Precipitation air-float water-purifying equipment |
| 09/22/1999 | CN1229402A Waste water treatment plant |
| 09/22/1999 | CN1229063A Treatment technology for papermaking waste liquor |
| 09/21/1999 | CA2164695C Composition for inhibiting stress cracks in plastic articles and methods of use therefor |
| 09/16/1999 | WO1999046205A2 Water recycling system for laundry or dish washing |
| 09/16/1999 | CA2323495A1 Recycling system for laundry wash water |
| 09/15/1999 | EP0941970A1 Treatment of aqueous effluents by injection of carbon dioxide |
| 09/15/1999 | EP0941755A1 Process and apparatus for industrial printing waste water purification |
| 09/14/1999 | US5951869 A water treatment for reducing the concentration of inorganic nitrate and/or nitrite by contacting with a fine metal particles |
| 09/14/1999 | US5951845 Demetallization by metal scavenger, electrochemical machining by passing a current through the cell, regenerating the organic hydroxide, recovering from cell; waste recycling |
| 09/10/1999 | WO1999045192A1 Method for treating process water |
| 09/10/1999 | CA2322209A1 Method for treating process water |
| 09/09/1999 | DE19807155A1 Verfahren zur Reinigung von Abwasser durch Kombination einer homogenen katalytischen Oxidation mittels Wasserstoffperoxid mit einem Membrantrennverfahren A process for the purification of waste water by combining a homogeneous catalytic oxidation by means of hydrogen peroxide with a membrane separation process |
| 09/08/1999 | CN2337141Y Multiple stage purifying device for producing living water |
| 09/08/1999 | CN1228008A Automated closed recirculating aquaculture filtration system |
| 09/08/1999 | CN1044999C Comprehensive processing method of tannery waste water |
| 09/07/1999 | US5948263 Method for separating water soluble organics from a process stream by aqueous biphasic extraction |
| 09/07/1999 | US5948230 Manufacturing hypochlorite solutions which comprises passing solution containing dissolved chlorine gas through diluting compartments of an electrodialysis stack, said compartments containing ion exchange granules and passing direct current |
| 09/07/1999 | US5946769 Self-contained, closed-loop, hard surface and carpet cleaning apparatus |
| 09/02/1999 | WO1999043622A1 Method and device for treating aqueous flows in a bioreactor, an ultrafiltration unit and a membrane filtration unit |
| 09/02/1999 | WO1999043619A1 Method for treating waste water from gold mines in order to obtain drinking water |
| 09/01/1999 | EP0938454A1 Multi-chamber water purification device and method of using the same |
| 09/01/1999 | EP0938453A1 Process for the removal of dissolved metals and/or metalloids from an aqueous medium containing same and having a high content of salt |
| 09/01/1999 | EP0938346A2 Flowable waste sanitizing process and system |
| 09/01/1999 | EP0824503B1 Waste water treatment process for producing high yields of drinking water |
| 09/01/1999 | CN2335964Y Purified water magnetizing and mineralizing device |
| 08/31/1999 | US5944989 Split-flow water filtration apparatus |
| 08/26/1999 | WO1999042407A1 Method for purifying waste water by combining hydrogen-peroxide supported oxidation with a membrane separation method |
| 08/26/1999 | CA2321503A1 Method for purifying waste water by combining hydrogen-peroxide supported oxidation with a membrane separation method |
| 08/24/1999 | US5942117 Anaerobic biodegradation of unsaturated, saturated, aromatic and halogenated hydrocarbons |
| 08/24/1999 | US5942107 Cyclone separator; filter |
| 08/24/1999 | US5942098 Method of treatment of water and method and composition for recovery of precious metal |
| 08/24/1999 | CA2019931C Apparatus producing continuously electrolyzed water |
| 08/18/1999 | EP0936188A1 Process for reducing viscosity of water through electrolysis |
| 08/18/1999 | CN1225901A Health-care drinking apparatus and mineralizd substance treatment method |
| 08/17/1999 | US5938933 Roof-mounted heating/ventilation/air conditioning (hvac) unit pan having baffles which direct flowing condensate water through beds of copper ion adsorbing charcoal and mossy zinc material prior to drainage; corrosion resistance |
| 08/11/1999 | CN2332721Y Water purifying device |
| 08/11/1999 | CN2332720Y Superpure water processor for lab |
| 08/11/1999 | CN2332719Y Combination filter element |
| 08/11/1999 | CN1225337A Process for reducing viscosity of water through electrolysis |
| 08/10/1999 | US5935426 Water treatment device with volumetric and time monitoring features |
| 08/05/1999 | WO1999038810A1 Water treatment process |
| 08/04/1999 | EP0933336A1 Waste pre-treatment and modular process comprising said pre-treatment |
| 08/04/1999 | EP0933332A1 Electrolysis of water resulting in the reduction of fat content in the human liver |
| 08/04/1999 | EP0741671A4 Biodegradation of methanesulfonic acid |
| 08/04/1999 | CN1225034A Method of reducing the number of pollutants in a gas flow and device for carrying out said method |
| 08/03/1999 | US5932109 Plating rinse water treatment |
| 08/03/1999 | US5931174 Apparatus and method for cleaning articles |
| 07/29/1999 | WO1999037588A1 On board treatment system |
| 07/28/1999 | EP0931766A2 Method and device for water treatment, especially for water jet cutting devices |
| 07/28/1999 | CN2330648Y 团体饮水净化机 Bodies of water purification machines |
| 07/28/1999 | CN1223975A Process for treatment and reutilization of black liquor from paper making plant |
| 07/28/1999 | CN1223974A Process for deeper purifying drinking water |
| 07/28/1999 | CN1223973A Method and apparatus for integral treatment of drinking water |
| 07/27/1999 | US5928514 On board treatment system |
| 07/27/1999 | US5928492 Method and apparatus for recovery of water and slurry abrasives used for chemical and mechanical planarization |
| 07/27/1999 | CA2248595C Off-shore sewage treating and handling apparatus and method |
| 07/22/1999 | DE19801867A1 Post-treatment of water from final stage of waste water clarification plant |
| 07/21/1999 | EP0930274A1 Method for purifying an aqueous tin-containing medium |
| 07/21/1999 | EP0930273A2 Method and device for the treatment of surface water with a high algae content |
| 07/21/1999 | CN2329660Y Pipeline-type water treater for purifying water |
| 07/21/1999 | CN1223605A Drinking water filtration system |
| 07/21/1999 | CN1223079A Process for extracting protein from waster water of starch |
| 07/20/1999 | US5925292 Water charging machine |
| 07/20/1999 | US5925255 Elimination of scale causing impurities prior to concentrating feedwater stream at a selected ph, raising ph to more fully ionize remaining impurities and passing feedwater through membrane separator to elute pure water |
| 07/20/1999 | US5925240 Water treatment system having dosing control |