| Patents for C02F 9 - Multistep treatment of water, waste water or sewage (41,429) |
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| 07/16/1991 | US5032289 In situ off-shore processing of urban sewage without using or contaminating urban land |
| 07/16/1991 | US5032287 Septic tank effluent processing vaporizer |
| 07/16/1991 | US5032286 Flocculation |
| 07/16/1991 | US5032265 Method and system for producing sterile aqueous solutions |
| 07/11/1991 | WO1991009659A1 Water distillation apparatus |
| 07/10/1991 | EP0436090A1 Process for the purification of waste water from car washing plants |
| 07/10/1991 | EP0436082A2 Separation of formaldehyde and/or dispersed colloids from production waste water, as well as usage of the generated precipitate |
| 07/04/1991 | DE4042210A1 Removing arsenic and other metals from waste water - by treating with hydrogen sulphide and removing pptd. sulphide(s) |
| 07/03/1991 | EP0434810A1 Wastewater treatment |
| 07/03/1991 | EP0397742A4 Porous article impregnation resin composition, and system for treating impregnation process waste water |
| 06/27/1991 | WO1991009145A2 Method for recovering metals from waste liquors |
| 06/27/1991 | DE3941989A1 Cleaning acid waste water from glass industry contg. sulphuric acid - by passage through strongly basic anion exchanger and through chelate resin exchanger contg. active oxime Gps. |
| 06/26/1991 | EP0434107A1 Method for processing residual fixing-baths |
| 06/26/1991 | EP0433893A2 Process and system for purifying pure water or ultrapure water |
| 06/25/1991 | US5026488 Pumping fluid impurities through filter loop, heating, separating, cooling and analyzing processed fluids; injection of additives; mobile and self-powered in a vehicle |
| 06/25/1991 | US5026485 Remove styrene-acrylonitrile copolymer and polyvinyl alcohol with sodium metaborate and ferrous sulfate; flocculation |
| 06/25/1991 | US5026477 Water purifying combination and ultraviolet lamp therefor |
| 06/19/1991 | EP0433200A1 Water filtration and purification process |
| 06/19/1991 | EP0432906A1 Filter |
| 06/19/1991 | EP0432250A1 Process for reducing the cyanide content of a solution. |
| 06/18/1991 | US5024766 Point of use deionized water purification unit |
| 06/13/1991 | WO1991008174A1 Processing plant for i.a. sanitary slaughtering |
| 06/11/1991 | US5022999 Method of treating starch-containing water |
| 06/04/1991 | US5020321 Exhaust powered waste processing unit |
| 05/30/1991 | WO1991007354A1 Water treatment method |
| 05/29/1991 | EP0151120B1 Method for removing heavy metals from aqueous solutions by coprecipitation |
| 05/28/1991 | US5019273 Method for recovery of heavy metals from highly concentrated wastewater solutions |
| 05/21/1991 | US5017284 Fluid purifying apparatus and method of purifying fluids |
| 05/15/1991 | EP0427191A1 Process for removing dissolved oxygen from water and system therefor |
| 05/15/1991 | EP0426933A1 Method and plant for the treatment of leachate from sanitary landfills for municipal solid waste and similar wastes |
| 05/15/1991 | CA2006512A1 Water treatment method |
| 05/14/1991 | US5015396 Removal of cyanide from aqueous streams |
| 05/14/1991 | US5015370 Apparatus and method for treating well water |
| 05/14/1991 | CA1284098C Controlling respiratory disease-causing bacteria in water recirculating systems |
| 05/08/1991 | EP0426215A1 Method for purifying flue gases |
| 05/08/1991 | EP0426160A1 Decontamination system |
| 05/08/1991 | DE3941951A1 Combined chemical-biological treatment of contaminated waste - has washing reaction operating intermittently |
| 05/07/1991 | US5013456 Diallyldimethyl ammonium chloride polymers with anionic monomers for coagulating deinking process waters |
| 05/07/1991 | US5013453 Forming ferric hydroxide precipitate in which trace metals are occluded |
| 05/07/1991 | US5013415 Liquid purification system |
| 05/07/1991 | CA1283900C Carboxylated surfactant-containing lubricants, production and use |
| 05/02/1991 | EP0424455A1 Apparatus for treating a fluid |
| 05/02/1991 | DE3936082A1 Decontaminating waste water contg. cyanide using sodium hypochlorite - controlling feed time and rate of hypochlorite to limit concn. of chloro-cyan |
| 05/02/1991 | DE3935506A1 Removing hydrocarbon(s) from condensate water obtd. in dry cleaning - by liq.-liq. extn. followed by adsorption |
| 04/30/1991 | US5011605 Sewage treatment plant |
| 04/30/1991 | US5011599 Ozonization to diamino-s-triazine; metabolism, degradation to carbon dioxide and ammonium |
| 04/30/1991 | CA1283512C Sulfite cooking method for the production of cellulose from materials containing lignocellulose with recovery of the cooking chemicals |
| 04/28/1991 | WO1991006701A1 Method of processing used paper in the presence of hydroxysulphonate salts |
| 04/28/1991 | CA2071823A1 Process for regenerating wastepaper in the presence of hydroxysulfaonate salts |
| 04/24/1991 | EP0423400A1 Waste disposal device |
| 04/24/1991 | CN1050858A Treating method of methyl sulfur bacterium panacea waste water |
| 04/23/1991 | US5009801 Compositions for preventing stress cracks in poly(alkylene terephthalate) articles and methods of use therefor |
| 04/23/1991 | US5009793 Acidification to dissolve as soluble salts, oxidation and precipitation as hydroxides; control of PH for preferential separation |
| 04/18/1991 | WO1991004949A1 Water purification process |
| 04/16/1991 | US5008017 Mixing silver containing sludge with metal bicarbonate and carbonates to form free-flowing powder |
| 04/16/1991 | US5007994 Water purification system |
| 04/11/1991 | DE3932565A1 Water softening system - based on bottle neck with permanent magnet |
| 04/10/1991 | EP0421563A1 Method and apparatus for producing activated mineral water |
| 04/10/1991 | EP0421399A1 Method of treating fluoride-containing water |
| 04/09/1991 | US5006245 Water purifying device |
| 04/09/1991 | US5006233 Water purification system |
| 04/09/1991 | US5006232 Sewage treatment plant |
| 04/09/1991 | US5005787 Method and apparatus for bio-regenerative life support system |
| 04/03/1991 | EP0420499A2 Portable toilet |
| 04/03/1991 | EP0419841A1 Process for diminishing the AOX-concentration in water |
| 04/02/1991 | US5004531 Treatment of concentrated industrial wastewaters originating from oil shale and the like by electrolysis polyurethane foam interaction |
| 03/29/1991 | CA2023497A1 Raw sewage drying apparatus |
| 03/28/1991 | DE3931013A1 Arrangement for removing volatile impurities from ground water - in which efficiency of system for passing cleaning gas through water in borehole is improved by recirculating some of used cleaning gas |
| 03/27/1991 | EP0418570A1 Device for the purification of polluted ground water |
| 03/27/1991 | CN1050217A Method and equipments for extracting matter containing fat and proteins from fluid stock |
| 03/27/1991 | CN1050171A Process for purifying effluent from urea production plants |
| 03/26/1991 | US5002645 Process of separating and recovering metal values from a waste stream |
| 03/21/1991 | WO1991003305A1 Process and installation for extracting fat and/or protein-containing material from fat-containing liquid material, in particular from slaughter deposits and waste |
| 03/20/1991 | EP0417829A1 Process for purifying the effluent from urea production plants |
| 03/20/1991 | EP0417506A1 Electrodeionization and ultraviolet light treatment method for purifying water |
| 03/20/1991 | EP0417185A1 A process for removing nitrogen compounds from raw water. |
| 03/20/1991 | CN2073413U Well washing vehicle |
| 03/20/1991 | CN1050012A Process for treating waste water |
| 03/19/1991 | US5000859 Process for sodium sulfide/ferrous sulfate treatment of hexavalent chromium and other heavy metals |
| 03/19/1991 | US5000858 Method for removing hexavalent chromium from water |
| 03/19/1991 | US5000852 Removal of metal ions from solutions |
| 03/19/1991 | US4999857 Toilet sewage treatment unit |
| 03/14/1991 | DE4026320A1 Verfahren zur reinigung und aufbereitung von verunreinigtem gut Process for cleaning and treatment of contaminated well |
| 03/14/1991 | DE3929634A1 Removing hydrocyanic acid and cyanide(s) from water - by introduction of aldehyde, conversion to nitrile and oxidn. to acid |
| 03/12/1991 | US4999116 Waste water treatment method |
| 03/12/1991 | US4999114 Method of treating spent dryfilm stripping and developing solutions with a chemical mixture |
| 03/07/1991 | WO1991002699A1 Microwave method |
| 03/07/1991 | WO1991002565A1 Process for purifying and processing contaminated materials |
| 03/07/1991 | DE3928427A1 Removing heavy metals, esp. mercury from contaminated earth - by repeated washing and fractionation forming conc, fraction for furnace |
| 03/05/1991 | US4997573 Flocculation |
| 02/28/1991 | DE3938464A1 Cleaning contaminated solid materials - by mixing with washing fluid contg. chemical agent which dissolves contaminants and then adding biological agent |
| 02/28/1991 | DE3927346A1 Mobile system for treatment of liq. waste e.g. animal slurry, etc. - in which slurry is treated by vortex-forming nozzles in arrangement of small tanks connected to form treatment units |
| 02/27/1991 | EP0414653A1 Method of disposing of wastes containing heavy metal compounds |
| 02/27/1991 | EP0413813A1 Devices for treating human or animal dejections by means of micro-waves. |
| 02/26/1991 | US4995916 Solubilizing phenolic filter in aqueous solution of nitric acid, separating filter from housing |
| 02/22/1991 | WO1991003041A1 Treatment method for emulsified petroleum wastes |
| 02/22/1991 | CA2023597A1 Method of disposing of wastes containing heavy metal compounds |
| 02/21/1991 | WO1991001944A1 Process and apparatus for recycling food processing water |
| 02/21/1991 | WO1991001822A1 Correction method for contaminated sites |
| 02/21/1991 | WO1990015027A3 Methods for removing substances from aqueous solutions |