| Patents for C02F 3 - Biological treatment of water, waste water, or sewage (46,453) |
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| 07/24/1991 | WO1991011396A1 Method and reactor for purification of water |
| 07/24/1991 | EP0438073A1 Method and device for water purification |
| 07/24/1991 | EP0437718A1 Floating aerator |
| 07/23/1991 | US5034164 Hollow fibers, permeability |
| 07/23/1991 | US5034131 Heat treatment of wastes |
| 07/23/1991 | CA2008340A1 Process for aerobic enzymatic treatment of organic matter |
| 07/23/1991 | CA1286660C Impeller apparatus |
| 07/22/1991 | CA2008252A1 On-site microbiological clean-up of soils contaminated with toxic wood preservatives |
| 07/17/1991 | CN2080939U Elastic biocycle filling |
| 07/16/1991 | US5032324 High yield air diffuser for tanks used in the aerobic treatment of waste waters |
| 07/16/1991 | US5032289 In situ off-shore processing of urban sewage without using or contaminating urban land |
| 07/16/1991 | US5032276 Method of biological activating water cleaning with fluid filtration |
| 07/16/1991 | US5032261 Compact biofilter for drinking water treatment |
| 07/11/1991 | DE4101244A1 Nitrification of waste water - using immobilised microorganisms in stirred bio-reactor with floating support for microorganisms above water level |
| 07/10/1991 | EP0436254A1 Treatment of aqueous waste streams |
| 07/10/1991 | EP0436124A2 Filter body and process for its manufacture |
| 07/10/1991 | EP0436090A1 Process for the purification of waste water from car washing plants |
| 07/10/1991 | CN2080513U Domestic purifier for toilet sewage |
| 07/10/1991 | CN2080512U Integrative waste water treating apparatus by double biomembrane process |
| 07/10/1991 | CN1013104B Clarification device |
| 07/09/1991 | US5030353 Secondary sewage treatment system |
| 07/09/1991 | CA1286039C Process for the improved separation of clarified liquid from biomassin the biological treatment of sewage |
| 07/06/1991 | CA2033607A1 Treatment of aqueous waste streams |
| 07/03/1991 | EP0434810A1 Wastewater treatment |
| 07/03/1991 | CN1013027B Water purification apparatus |
| 07/02/1991 | CA1285510C Bacterial composition for the recovery of oil-polluted water and soil and a method for the recovery of water and soil |
| 06/27/1991 | WO1991008986A1 Method of disposal and degradation of toxic organic compounds |
| 06/27/1991 | DE4040540A1 Procedure for clarifying water contaminated with oils and fats - by removing contaminants at frequent intervals from fat trap and biologically cleaning before being discharged |
| 06/26/1991 | EP0434406A2 Trickle filtration apparatus |
| 06/20/1991 | DE3941211A1 Procedure and device for water treatment - by biologically purifying by flowing over roots of water plants in labyrinthine path |
| 06/19/1991 | EP0433139A1 Reactor and process for aerobic biological nitrification of effluents and carrier for nitrificating biomass |
| 06/19/1991 | EP0432651A1 Process for the purification of contaminated soils from biodegradable harmful substances |
| 06/19/1991 | EP0432276A1 Method of concentrating and dehydrating slurried sludge |
| 06/19/1991 | EP0432206A1 Wastewater treatment system |
| 06/19/1991 | EP0329703B1 High yield air diffuser for tanks used in the aerobic treatment of waste waters |
| 06/19/1991 | EP0321456B1 Process for decomposing mineral oil derivatives contained in washings and sludges |
| 06/18/1991 | US5024949 Detoxification of a liquid using pseudomonas to degrade trichloroethylene |
| 06/18/1991 | US5024770 Using contaminated groud water; bviodegradable material for agricultural products and clean refuse derived fuel |
| 06/16/1991 | CA2032248A1 Nitrifying biomass support, biological aerobic nitrification reactor and process for treating waste water |
| 06/12/1991 | EP0431993A1 Installation for complementary treatment of sewage |
| 06/12/1991 | EP0431498A1 Device for introducing gas into bodies of water |
| 06/12/1991 | EP0431081A1 Injector-diffuser generating physical-chemical reactions and its applications for balneo-hydrotherapy and treatment of fluids |
| 06/11/1991 | US5022993 Process for treating wastewater |
| 06/11/1991 | CA1284843C Method for preventing the bulking of activated sludge |
| 06/06/1991 | DE3940108A1 Gasification of ponds, streams and lakes for fish rearing - uses a buoyant gasification tube and rope or chain sinker line with hooks to keep gasification tube in water above sludge |
| 06/06/1991 | DE3939732A1 Removing nitrogen cpds. from water - by nitrification and withdrawing carbon di:oxide before denitrification in amt. corresp. to carbon di:oxide formed |
| 06/05/1991 | EP0430886A1 Water purification process |
| 06/04/1991 | US5021161 Controlling ratio of total aeration time versus influent flow rate to facilitate decomposition of wastes by microorganisms |
| 06/04/1991 | US5021154 Mixer/aerator for waste water |
| 05/30/1991 | WO1991007354A1 Water treatment method |
| 05/29/1991 | EP0429137A1 Process for the in-situ removal of pollutants from the soil |
| 05/29/1991 | EP0428747A1 Method and apparatus of filtering medium circulation type for purifying contaminated water |
| 05/29/1991 | EP0428537A1 Process and plant for the biological purification of waste water. |
| 05/28/1991 | US5019268 Purification using fluidized and fixed beds |
| 05/28/1991 | US5019267 Process for mesophilic or thermophilic aerobico-enzymic conditioning of liquid organic substances and biomass |
| 05/28/1991 | US5019266 Throttling aeration; pollution control |
| 05/28/1991 | US5019265 Process for activating the operation of a system for anaerobic digestion of solid organic residues |
| 05/23/1991 | DE3938555A1 Modular construction method for waste water purificn. system - in which central sedimentation chamber of modular construction elements is surrounded by biological water purificn. chamber |
| 05/23/1991 | DE3938461A1 Use of hydrophilic silicone rubber membrane - in gasification of aq. media without bubble formation |
| 05/21/1991 | US5017289 Process for in situ biodegradation of hydrocarbon contaminated soil |
| 05/18/1991 | WO1991007222A1 Device for fine foaming |
| 05/18/1991 | CA2045123A1 Fine bubble generating apparatus |
| 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 | US5015421 Diffusion device |
| 05/14/1991 | US5015385 Process for promotion of microbial consumption of waste water fats |
| 05/14/1991 | US5015384 Anaerobic process, flotation of a biomass, circulation to treat wastes |
| 05/08/1991 | EP0426160A1 Decontamination system |
| 05/08/1991 | EP0217962B1 Method of treating active sludge in waste water |
| 05/08/1991 | CN2076546U Sewage treatment device having new bio-disc |
| 05/07/1991 | US5013489 Sludge treatment apparatus |
| 05/07/1991 | US5013442 Aerobic wastewater treatment with alkalinity control |
| 05/07/1991 | US5013441 Sewage treatment, multizonal, anaerobic, baffles, hydrostatics, aeration, quiescent, circulation, homogeneity, decantation |
| 05/07/1991 | US5013431 Apparatus for anaerobic purification of waste water |
| 05/07/1991 | US5013429 Apparatus for stabilizing sludge |
| 05/07/1991 | CA1283983C Side channel clarifier |
| 05/07/1991 | CA1283982C Method of and apparatus for degrading organic products, by-products and scraps of human, animal and/or vegetable origin in an anaerobicmedium |
| 05/07/1991 | CA1283872C Process for the degradation of environmentally persistent organic compounds |
| 05/02/1991 | WO1991005749A1 Process for aerobic decomposition of highly charged waste water |
| 05/02/1991 | EP0424455A1 Apparatus for treating a fluid |
| 05/01/1991 | CN1051031A Treatment and recovery process of waste water in fabric board production |
| 04/30/1991 | US5011605 Sewage treatment plant |
| 04/30/1991 | US5011604 Harvesting thermophilic cyanobacteria |
| 04/30/1991 | US5011599 Ozonization to diamino-s-triazine; metabolism, degradation to carbon dioxide and ammonium |
| 04/30/1991 | US5011372 Aeration apparatus for pond |
| 04/30/1991 | CA1283512C Sulfite cooking method for the production of cellulose from materials containing lignocellulose with recovery of the cooking chemicals |
| 04/25/1991 | DE3934958A1 Device for biological cleaning of waste water - has inlet water flow divided unequally between cascade denitrification and nitrification to equalise biomass formation |
| 04/24/1991 | EP0423889A1 Method and installation for processing manure, fermented manure and Kjeldahl-N containing waste water |
| 04/24/1991 | EP0423404A1 Process for high-load treatment of carbohydrate-containing waste water |
| 04/23/1991 | US5009999 Aerobic process using Pseudomonas |
| 04/23/1991 | US5009786 Selenate removal from waste water |
| 04/19/1991 | WO1991005859A1 Polymer bead containing immobilized metal extractant |
| 04/18/1991 | DE4001482C1 Nitration bed, for waste water contg. nitrogenous organic cpds. - comprises assembly in circular tank comprising blocks on supports for bacteria supplied with oxygen |
| 04/18/1991 | DE3934122A1 Verfahren zur aeroben verrottung hochbelasteter abwaesser A method for aerobic decay highly polluted wastewater |
| 04/18/1991 | DE3933513A1 Biological waste-water treatment plant - by adsorption process, in which performance is improved by addition of final denitrification filtration stage |
| 04/18/1991 | DE3933326A1 Biological removal of phosphorus and denitrification of waste water - by addn. of easily degradable organic acids during denitrification-anaerobic stage |
| 04/18/1991 | CA2027787A1 Method and installation for processing manure, fermented manure and kjeldahl-n containing waste water |
| 04/17/1991 | EP0422876A1 Method of and apparatus for controlling waste water treatment by anaerobic fermentation |
| 04/17/1991 | CN2075193U Vertical biochemistry aeration device with two-stop circulation |
| 04/17/1991 | CN2075192U Lacertus biological fluidization carrier |