| Patents for C02F 9 - Multistep treatment of water, waste water or sewage (41,429) |
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| 12/02/1991 | CA2043466A1 Method for treatment of wastewater containing polyether polyols |
| 11/29/1991 | CA2017754A1 High-flow rate capacity aerobic biological dehalogenation reactor |
| 11/28/1991 | WO1991017958A1 Process for treating waste water |
| 11/28/1991 | DE4016156A1 Verfahren zum aufbereiten von abwasser Method for preparing of wastewater |
| 11/26/1991 | US5068038 Adsorption of halo-organic pollutants on iron(III) hydroxy complexes in flocculants and oxidation |
| 11/26/1991 | US5068030 Water filtering sterilizing and heating apparatus |
| 11/23/1991 | CA2042957A1 Method and installation for thermal disposal of sewage sludge |
| 11/19/1991 | US5066377 Electrophoresis apparatus, heating and cooling blocks at opposite ends of a thermoconductive plate, heat exchanging fluid flow through bores in the blocks |
| 11/19/1991 | US5066371 Cycling through liquid treatment containers; countercurrent flow |
| 11/19/1991 | US5065791 Fluid purifying apparatus and method of purifying fluids |
| 11/12/1991 | US5064531 Water filtration apparatus |
| 11/07/1991 | DE4014023A1 Decontamination of substance contg. cyanide, esp. waste water - by treatment with acid, and stripping and destruction of hydrogen cyanide formed |
| 11/06/1991 | CN2088106U Multi-functional combined water-purifying column |
| 11/06/1991 | CN1055974A Non-pollution technology for comprehensive utilization of alkaline straw-pulp black liquid |
| 11/06/1991 | CN1055910A Fluid purifying apparatus and method of purifying fluids |
| 11/05/1991 | US5062979 Soap free conveyor lubricant that gives clear solutions in water comprising alkoxyphosphate ester, alkyl benzene sulfonate and carboxylic acid |
| 11/05/1991 | US5062966 Process for decomposing solutions of hydroxylammonium salts |
| 11/05/1991 | US5062956 Bioremediation of chromium (VI) contaminated aqueous systems by sulfate reducing bacteria |
| 11/05/1991 | US5062940 Electrolytic liquid purification apparatus |
| 10/31/1991 | DE4013259A1 Removal of solid material content from fibrous suspensions - comprises filtering waste water, drying any solid to specified dry-matter content and mixing with sludge obtd. from further solid-liq. sepn. |
| 10/30/1991 | EP0454614A1 A fluid purifying apparatus and method of purifying fluids |
| 10/30/1991 | EP0454210A1 Process for elimination of phosphor and suspended matter from waste water |
| 10/30/1991 | EP0453706A2 Detoxification of exhausted baths of photographic processes and washings by means of anodic oxidation |
| 10/29/1991 | CA1291582C Disposal of material containing vanadium as landfill |
| 10/28/1991 | CA2036801A1 Fluid purifying apparatus and method of purifying fluids |
| 10/23/1991 | EP0453005A1 Process for scrubbing flue gases |
| 10/23/1991 | EP0452863A2 Process for treating wastes from waste waters obtained from the production of dyes |
| 10/22/1991 | US5059332 Method and device for treating oil sludge and oil-containing waste water |
| 10/22/1991 | US5059317 Transportable apparatus for producing drinking water |
| 10/19/1991 | CA2037839A1 Process of purifying exhaust gas |
| 10/16/1991 | EP0451430A1 Plant to depollute waste water, particularly water from olive crushers |
| 10/15/1991 | US5057220 Process for treating waste water |
| 10/10/1991 | WO1991015431A1 Method of purifying lacustrine water and filthy water purification boat |
| 10/09/1991 | EP0449996A1 Method of electrolytic treatment and unit therefor |
| 10/09/1991 | EP0317553B1 Process for treating pollutant effluent, particularly in the tanning industry, and plant for implementing the process |
| 10/08/1991 | US5055204 Tank with air injector for mixing dissolved oxygen into slurry to maintain slurries solids in suspension; trailer for transporting to treatment site |
| 10/02/1991 | DE4009589A1 Removing heavy metals from aq. soln.s esp. waste water - by pptn. to microcrystals used as seed crystals for gypsum casing giving easily filtered ppte. |
| 10/01/1991 | US5053143 Fluid purifying apparatus and method of purifying fluids |
| 10/01/1991 | US5053142 Method for treating polluted material |
| 10/01/1991 | US5053140 Injecting gases in wastewater at bottom of tower; forming an overflowing of fat and impurities; poultry; countercurrent flow; reuse |
| 09/26/1991 | DE4009249A1 Filter medium for purificn. of effluent waters etc. |
| 09/24/1991 | US5051191 Method to detoxify sewage sludge |
| 09/24/1991 | US5051187 Process for recovering sulfuric acid |
| 09/24/1991 | US5051161 Apparatus producing continuously electrolyzed water |
| 09/24/1991 | US5050511 Reduction of organic waste,transferring and cooling, condensation followed by recycling |
| 09/23/1991 | WO1991014657A1 Process and installation for purifying waste water |
| 09/23/1991 | CA2077685A1 Process and installation for purifying waste water |
| 09/19/1991 | WO1991013833A1 Waste water treatment process using improved recycle of high density sludge |
| 09/18/1991 | EP0446926A1 Apparatus for waste water clarification |
| 09/17/1991 | WO1991013834A1 Method and apparatus for treatment of liquid photographic pr ocessing wastes |
| 09/17/1991 | CA2057003A1 Method and apparatus for treatment of liquid photographic processing wastes |
| 09/17/1991 | CA1288952C Metal recovery process |
| 09/16/1991 | CA2031631A1 Decyanation apparatus and process for purifying water from cyanide using the same |
| 09/12/1991 | DE4007270A1 Mercury sepn. from solids e.g. soil - by contact with additional mercury, and density sepn. |
| 09/12/1991 | DE4006974A1 Gel electrophoretic sepn. with temporal or spatial temp. gradients |
| 09/11/1991 | EP0445792A1 Process and device for simultaneous disinfection as well as removal of nitrates/nitrites and other absorbable matter from drinking water |
| 09/11/1991 | CN1054405A Method for treating waste liquid from gourmet powder plant and products thereof |
| 09/10/1991 | US5047126 Method for recovering metal from waste stream |
| 09/08/1991 | CA2037758A1 Process and device suitable for the simultaneous disinfection and removal from drinking water of nitrate/nitrite ions as well as other adsorbable substances |
| 09/07/1991 | WO1992011213A1 Processing waste solidification |
| 09/05/1991 | WO1991013036A1 Process for purification of waste water |
| 09/05/1991 | WO1991013031A1 Water treatment |
| 09/04/1991 | EP0444530A1 Process and device for water detoxification |
| 09/04/1991 | CN1013768B Process for treatment waste solution containing ammonium ions and fluorineions |
| 09/03/1991 | US5045214 Methods for removing substances from aqueous solutions |
| 09/03/1991 | US5045213 Precipitating metals with calcium dithiocarbamate |
| 09/03/1991 | CA1288532C Method of removing macromolecular organic dissolved and colloidal material from wood processing industry effluents |
| 08/28/1991 | EP0193565B1 Apparatus for clarification of water |
| 08/28/1991 | CN1054054A Pollution treatment and the method and equipment for using waste water |
| 08/27/1991 | US5043072 Method of treating fluoride-containing water |
| 08/27/1991 | US5043066 Fluid purifying apparatus and method of purifying fluids |
| 08/22/1991 | WO1991012565A1 Method and apparatus for removing silver in the form of silver salts from a liquid |
| 08/22/1991 | WO1991012209A1 Method and apparatus for treating water in a cooling system |
| 08/22/1991 | WO1991012208A1 Treatment of wastewater |
| 08/21/1991 | EP0441938A1 Process and installation for extracting fat and/or protein-containing material from fat-containing liquid material, in particular from slaughter deposits and waste. |
| 08/21/1991 | CA2036543A1 Liquid recycling system |
| 08/14/1991 | EP0441209A1 Method for the utilization of carbon black coming from synthesis gas production |
| 08/14/1991 | EP0304427B1 Process for dephenolating waste water from coking plants |
| 08/13/1991 | US5039498 Processes for the purification of flue gases |
| 08/13/1991 | US5039428 Waste water treatment process using improved recycle of high density sludge |
| 08/13/1991 | US5039416 Process for the purification of industrial waste-waters |
| 08/13/1991 | US5039411 Fluid purifying apparatus and method of purifying fluids |
| 08/13/1991 | US5039407 Water reclamation and collection unit |
| 08/13/1991 | US5039402 Water purifier |
| 08/08/1991 | WO1991011392A1 Method of cleaning soil water |
| 08/08/1991 | WO1991011243A1 Device for purifying sewage |
| 08/08/1991 | WO1991009145A3 Method for recovering metals from waste liquors |
| 08/07/1991 | EP0439770A2 Process for removing harmful substances and recovering valuable substances from a coking plant waste water stream |
| 08/06/1991 | US5037551 High-flow rate capacity aerobic biological dehalogenation reactor |
| 08/06/1991 | US5037547 Dual stage filter cartridge for a reverse osmosis purification system |
| 07/31/1991 | EP0439131A1 Process and apparatus for purification of waste water polluted by monomers and oligomers |
| 07/31/1991 | CN1053413A Process and apparatus for treadment of brines and contaminated mineral salts or mixtures thereof |
| 07/30/1991 | US5035809 Controlling water pollution |
| 07/30/1991 | CA2074840A1 Sewage purification apparatus |
| 07/30/1991 | CA2074829A1 Method for purifying sewage |
| 07/25/1991 | WO1991010622A1 Water purifier |
| 07/25/1991 | DE4001850A1 Treating waste water contg. monomer or oligomer |
| 07/23/1991 | US5034138 Method and apparatus for producing activated mineral water |
| 07/18/1991 | DE4040838A1 Pulsating inert gas expelling volatile contaminants from terrain - and ground water prevents explosive mixt. formation |
| 07/17/1991 | CN1013193B Process for treatment of waste water from distillers' grains |