| Patents for C02F 3 - Biological treatment of water, waste water, or sewage (46,453) |
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| 03/07/1990 | EP0356870A1 Method and apparatus for the biotechnological treatment of liquids in a vertical fixed bulk bed |
| 03/06/1990 | USRE33177 In place gas cleaning of diffusion elements |
| 03/06/1990 | US4906363 Water aeration apparatus |
| 03/06/1990 | US4906359 Solar activated water aeration station |
| 03/01/1990 | DE3828579A1 Method for the filtration of waste water (effluent) treated in sewage treatment plants and apparatus for carrying out the method |
| 02/28/1990 | EP0355189A1 Process for thickening/dewatering sewage sludge |
| 02/27/1990 | US4904420 Method and a device for introducing a gas into a liquid |
| 02/27/1990 | US4904388 Process for sludge thickening |
| 02/27/1990 | US4904387 Waste treatment and water recycling toilet system |
| 02/27/1990 | US4904386 Method of purifying liquids like wastewater by means of a filter bed containing aquatic plants planted in such filter bed |
| 02/22/1990 | WO1990001538A1 Bioreactor using open-cell porous ceramic carrier |
| 02/22/1990 | WO1990001465A1 A process for the microbiological purification of water and a microorganism for use in said process |
| 02/22/1990 | WO1990001366A1 Device for introducing gas in a liquid |
| 02/22/1990 | WO1990001263A1 Water purification system and apparatus |
| 02/22/1990 | DE3916250A1 Mixing chamber module - with coaxial ring channels in each half joined by serated radial webs |
| 02/22/1990 | DE3827713A1 Fish tank for intensive fish culture |
| 02/21/1990 | EP0355022A1 Apparatus and process for microbiological water treatment |
| 02/21/1990 | CN1039784A Waste water treatment technology for fine p-phthalic acid |
| 02/20/1990 | US4902302 Conservation of momentum in a barrier oxidation ditch |
| 02/15/1990 | DE3826968A1 Separator for oils and fats situated, in particular, in waste waters |
| 02/15/1990 | DE3823408C1 Clarifying apparatus for biological waste water purification having an immersed trickling filter |
| 02/14/1990 | EP0354239A1 Installation and device for purifying contaminated soils. |
| 02/14/1990 | CN1006777B Purification method for the waste water produced for hardboard wet process |
| 02/13/1990 | US4900437 Device for the introduction of a fluid in a receiving medium, such as that of an apparatus used for the treatment of liquids, notably water |
| 02/08/1990 | DE3826519A1 Process for the biological clarification of waste water |
| 02/08/1990 | DE3826147A1 Process for treating waste water |
| 02/08/1990 | DE3825312A1 Method for influencing and/or controlling the composition of natural or artificial microbial mixed biocoenoses |
| 02/08/1990 | DE3821932A1 Process and apparatuses for the aerobic biological purification of lightly organically polluted waste waters with simultaneous nitrification |
| 02/07/1990 | CN1039402A Process and plant for biological purification of waste water |
| 02/07/1990 | CN1006699B Net menbrane aerator |
| 02/06/1990 | US4898829 Apparatus for the detection of biodegradable and toxic substances in aqueous solutions |
| 02/06/1990 | US4898672 Oxygen controlling wastewater treatment method |
| 02/01/1990 | DE3825229A1 Process and apparatus for the biological processing of organically polluted liquids |
| 02/01/1990 | DE3823459C1 Throughflow body |
| 01/31/1990 | EP0352891A1 Process for treatment of water containing volatile and toxic compounds |
| 01/30/1990 | US4897356 Fixing microorganisms to inner surface of hollow tube; then immersion in treatment fluid, rotation; treatment of sewage and industrial waste water |
| 01/30/1990 | US4897204 Pressurization, ceramic wall penetration, discharging |
| 01/30/1990 | US4897196 Two-stage batch wastewater treatment |
| 01/30/1990 | CA1265266A1 Method and apparatus for biological aerobic wastewater treatment |
| 01/30/1990 | CA1265082A1 Analog enrichment decontamination process |
| 01/30/1990 | CA1265080A1 Porous inorganic carriers bearing a growth of micro- organisms - procedure for immobilising micro- organisms and carrier bodies suitable for this purpose |
| 01/25/1990 | WO1990000527A1 Apparatus for treating a fluid |
| 01/25/1990 | DE3906604A1 Functional system and construction system for small waste water (effluent) treatment plants having an assigned structural component set |
| 01/25/1990 | DE3834317C1 Apparatus for introducing gas into a liquid |
| 01/24/1990 | EP0352219A2 Pretreatment of industrial waste water in a biological purification process |
| 01/24/1990 | EP0352129A1 Organic sewage treatment process using polyvinyl pyridine |
| 01/24/1990 | EP0351922A1 A process and an apparatus for treatment of manure, in particular liquid manure |
| 01/24/1990 | CN2051631U Biotransformation |
| 01/23/1990 | US4895645 Anaerobic/aerobic filter plant |
| 01/18/1990 | DE3916737A1 Engineering arrangement for the biodegradation of chlorinated organic solvents |
| 01/17/1990 | EP0351394A2 Process for simultaneously maximizing methane yield and minimizing hydrogen sulfide development in the treatment of domestic and/or industrial organic wastes in clarification plants |
| 01/17/1990 | EP0351148A1 Apparatus for treating a fluid |
| 01/16/1990 | US4894341 Production of cyanide hydratase |
| 01/16/1990 | US4894162 Treatment of volatile organic substances at waste water treatment plants |
| 01/11/1990 | WO1990000158A1 Process and plant for the biological purification of waste water |
| 01/11/1990 | WO1990000157A1 Process for decomposition of metal-cyano complexes using microbial enzymes |
| 01/11/1990 | DE3921077A1 Biological filter for water purification plants |
| 01/11/1990 | DE3839576C1 Dry filter for water treatment |
| 01/10/1990 | EP0349708A1 Process for water purification |
| 01/09/1990 | US4892658 Wastewater treatment system |
| 01/03/1990 | EP0349441A1 Product and process for activating an anaerobic digestion system for residual organic solids |
| 01/03/1990 | EP0349437A1 Apparatus for the automatic measurement of the apparent weight of a mud suspended in a liquid, system for the automatic measurement of the Ponsar's index of such a mud, using the apparatus, and its use in the conduit in a plant for purifying waste water |
| 01/03/1990 | EP0349348A1 Process for decomposition of metal-cyano complexes using microbial enzymes |
| 01/02/1990 | US4891136 Method for controlling filamentous organisms in wastewater treatment processes |
| 12/27/1989 | EP0347965A2 A method and a device for purifying dredgings or ground contaminated with polluants |
| 12/27/1989 | EP0347595A1 Process for running a waste water plant |
| 12/27/1989 | CN1038258A Biologic spiral bed process and suspended filler for treating organic waste water |
| 12/27/1989 | CN1006223B Intensified biochemical treament of wastewater containing phenol and cyanide |
| 12/26/1989 | US4889620 In place gas cleaning of diffusion elements |
| 12/20/1989 | EP0347296A1 Process and apparatus for waste water purification on a biological filter with particles less dense than water |
| 12/20/1989 | EP0346990A1 Installation for the biological treatment of a liquid and drum for immobilizing microorganisms contained in such an installation |
| 12/20/1989 | CN2049644U Fiber plasticity composite filler for sewage treatment by biochemical process |
| 12/14/1989 | WO1989012029A1 A process for removing nitrogen compounds from raw water |
| 12/14/1989 | DE3819965A1 Process and apparatus for the anaerobic fluidised-bed purification of waste water |
| 12/14/1989 | DE3818906A1 Process and apparatus for measurement of the toxicity of aqueous solutions, in particular wastewater |
| 12/13/1989 | EP0346282A1 Process for the batched disinfection of sewage sludge |
| 12/13/1989 | EP0346109A1 Device for circulation and gas exchange in liquids |
| 12/13/1989 | EP0346013A1 Process for treating wastewater |
| 12/13/1989 | EP0345669A2 Process and device for activated biological waste water treatment |
| 12/12/1989 | US4886605 All-purpose septic tank |
| 12/07/1989 | DE3915059A1 Apparatus for carrying out biotechnological processes |
| 12/07/1989 | DE3818646A1 Process for biological waste water purification |
| 12/06/1989 | EP0345207A1 Aeration device |
| 12/05/1989 | US4885094 Anaerobic fermentation; adding sugar solution to control carbon-nitrogen ratios; sewage treatment |
| 12/05/1989 | US4885093 Treatment with activated sludge, first under anaerobic conditions, then under aerobic conditions; settling |
| 12/05/1989 | US4885084 Nozzle/venturi with pressure differentiating bypass |
| 12/05/1989 | CA1263769A1 Water treatment method and apparatus |
| 11/30/1989 | WO1989011318A1 Process for producing silicon caoutchouc tube membranes with mechanical wall reinforcement, development of tube membranes with mechanical wall reinforcement and their use |
| 11/30/1989 | DE3817560A1 Verfahren zur herstellung von rohrmembranen aus silikonkautschuk mit einer mechanischen wandverstaerkung, ausbildung von rohrmembranen mit einer mechanischen wandverstaerkung und anwendung dieser rohrmembranen Process for the manufacture of tubular membranes made of silicone rubber with a mechanical wandverstaerkung, training of tubular membranes with a mechanical wandverstaerkung and application of these tubular membranes |
| 11/30/1989 | DE3817262A1 Control apparatus for setting the speed of rotation of rotary sprinklers in trickling filters and sewage treatment plants |
| 11/28/1989 | US4883602 Water treatment, constant discharge rate |
| 11/28/1989 | US4883594 Purification, mechanical stability, microorganisms |
| 11/28/1989 | CA1263377A1 Vortex-draft-tube mixer for solids and liquids |
| 11/28/1989 | CA1263327A1 Process for in situ biodegradation of hydrocarbon contaminated soil |
| 11/23/1989 | EP0342722A1 Apparatus and method for anaerobic purification of waste water |
| 11/23/1989 | DE3831396C1 Process and biologically active substances for the microbiological breakdown of acetonitrile in mobile phases from high pressure liquid chromatography |
| 11/23/1989 | DE3816679A1 Process and apparatus for the continuous elimination of pollutants from waters |
| 11/23/1989 | DE3816285A1 Fixed-bed body for biological waste water purification |
| 11/23/1989 | DE3816283A1 Aerator for a biological waste water purification plant |
| 11/23/1989 | DE3815865A1 Apparatus for support-immobilised waste water purification |