| Patents for C02F 3 - Biological treatment of water, waste water, or sewage (46,453) |
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| 01/09/1991 | EP0406733A2 Method for removing halogenated organic compounds from waste water |
| 01/09/1991 | EP0406689A1 Process for two-stage anaerobic treatment of organically polluted waste waters and sludges |
| 01/09/1991 | EP0383789A4 A process for in situ biodegradation of hydrocarbon contaminated soil |
| 01/08/1991 | US4983299 Removal of phenols from waste water by a fixed bed reactor |
| 01/08/1991 | US4983298 Process for the disinfection and aerobic stabilization of sewage sludge |
| 01/08/1991 | US4983297 Waste water treating process scheme |
| 01/08/1991 | US4983285 Individual wastewater treatment plant |
| 01/04/1991 | WO1991000249A1 Method of concentrating and dehydrating slurried sludge |
| 01/03/1991 | DE3921436A1 Oxidative removal of harmful substances from effluent water - by subjecting to biological pretreatment, oxidative treatment with air etc. and treating with ozone to cause ozone oxidn. |
| 01/02/1991 | EP0406076A1 Device for the introduction of a liquid into an environment consisting of a granular material, with a view to fluoridizing this material |
| 01/02/1991 | EP0406032A1 Process for biological treatment of dissolved nitrates |
| 01/02/1991 | EP0405571A1 Process for the elimination of liquid manure |
| 01/02/1991 | EP0404782A1 Process for culture of aquatic animals. |
| 01/02/1991 | CN2068417U Elastic stereo padding |
| 01/01/1991 | US4981623 Diffuser for aeration basin |
| 01/01/1991 | US4981593 Sewage treatment |
| 01/01/1991 | US4981592 Biodegradation |
| 01/01/1991 | US4981582 Process and apparatus for separating fine particles by microbubble flotation together with a process and apparatus for generation of microbubbles |
| 12/27/1990 | EP0403654A1 Multiple gas phase liquid treatment apparatus |
| 12/20/1990 | DE3919368A1 Device for purificn. of waste water - in which unit consisting of outer vessel contg. a number of conical inner vessels can encompass several different water treatment processes |
| 12/20/1990 | DE3919297A1 Combining washing of hydrocarbon from waste air - with bio-filtration of washings |
| 12/20/1990 | DE3918717A1 Active charcoal like material prodn. from activated sludge - by pyrolysis in absence of air, used to improve performance of waste water purifiers |
| 12/19/1990 | EP0402826A1 Process for the preparation of ethylene copolymers filled with non-fibrous carbohydrates |
| 12/19/1990 | CN2067602U Elastic combined filler |
| 12/19/1990 | CN1010854B Treatment method of activated sludge of sewage or industrial waste water |
| 12/18/1990 | US4978445 Aeration chamber for a sewage treatment system |
| 12/16/1990 | CA2016976A1 Preparation of ethylene copolymers containing nonfibrous carbohydrates as fillers, and their use |
| 12/13/1990 | WO1990015030A1 Inhibitor of abnormal phenomena of activated sludge and method of inhibitng abnormal phenomena of activated sludge |
| 12/13/1990 | WO1990015028A1 A method for biological treatment of wastewater |
| 12/13/1990 | DE3918803A1 Cleaning surface water - where rain-water etc. is cleaned in system consisting of sedimentation stage, sepn. of floating matter and biological filtration |
| 12/12/1990 | EP0402158A2 Apparatus and method for bioremediation of sites contaminated with hazardous substances |
| 12/12/1990 | EP0402157A1 Fixed bed bioreactor remediation system |
| 12/11/1990 | US4976864 Anaerobic digestion of hydrolysed effluents |
| 12/11/1990 | US4976863 Wastewater treatment process |
| 12/11/1990 | US4976751 Method for purification of exhaust air |
| 12/08/1990 | CA2018622A1 Fixed bed bioreactor remediation system |
| 12/08/1990 | CA2018621A1 Apparatus and method for bioremediation of sites contaminated with hazardous substances |
| 12/06/1990 | DE3918295A1 Activated sludge vessel aeration and agitation system - central propeller delivers liq. downwards and stationary vanes located parallel to banks of aeration elements prevent rotation of liq. |
| 12/05/1990 | EP0400837A1 Boiler operating method with gases produced from bioreactor |
| 12/05/1990 | CN2066858U Cage composite filler |
| 12/05/1990 | CN1047483A Filtering material circulating-type process for purification of sewage, and apparatus therefor |
| 12/04/1990 | US4975197 Controlled suitable supply of oxygen to meet the biological oxygen demand |
| 12/04/1990 | US4975196 Two reactors-positive growth rate and negative growth rate of microorganisms; reversal of flow of waste |
| 12/04/1990 | US4975194 Heating and mixing with a mixture containing oxygen gas and circulated vent gas |
| 12/04/1990 | US4975193 Method for removing cyanide from a fluid |
| 12/04/1990 | US4975190 Organic polymer separation membrane having fluorene skeleton and oxygen enrichment device utilizing same |
| 12/02/1990 | WO1990015029A1 Wastewater treatment |
| 12/02/1990 | CA2056441A1 Wastewater treatment |
| 11/29/1990 | DE3916679A1 Installation for purifying waste water, esp. domestic waste water - has 2 biologically intensified filtration stages, 1st ŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸ for nitrification and 2nd for denitrification |
| 11/29/1990 | CA2014269A1 Process for the biological treatment of dissolved nitrates |
| 11/28/1990 | EP0399380A1 Waste water treatment plant |
| 11/27/1990 | WO1990014313A1 Method and apparatus of filtering medium circulation type for purifying contaminated water |
| 11/27/1990 | CA2033165A1 Sewage disposal method employing circulating filter media and an apparatus carrying out the same |
| 11/27/1990 | CA1277045C Removal of dioxins, pcb's and other halogenated organic compounds from wastewater |
| 11/27/1990 | CA1276864C Method for the monitoring and control of microbial populations |
| 11/22/1990 | EP0397824A1 Use of aminoaldehyde polymers for purifying waste water |
| 11/22/1990 | DE3916520A1 Biological clarifier vessel using aerobic-selective principle - comprises insulated vertical cylindrical vessel divided into concentric zones for aeration, clarification and sedimentation |
| 11/22/1990 | DE3915930A1 Removing harmful substances from fluid - by passing fluid through polymer, lipoid or oil dispersed in medium, and removing with microorganisms |
| 11/21/1990 | CN1010474B Air diffuser for tanks used in the aerobic treatment of waste water |
| 11/20/1990 | US4971698 Treatment of water containing biodegradable aliphatic compound with microorganism immobilized on gel type substrate |
| 11/20/1990 | US4971690 Waste water drainage and recovery system |
| 11/14/1990 | EP0397645A1 Apparatus for distributing gases in fixed bed filters |
| 11/14/1990 | EP0222799B1 Process for introducing oxygen into water and device for implementing the process |
| 11/14/1990 | CN2065619U Fiber-plastics combined filling material |
| 11/13/1990 | US4970000 Water treatment |
| 11/13/1990 | CA1276323C Process for the biological treatment of sewage |
| 11/08/1990 | DE3917595A1 Microbiological breakdown of volatile hydrocarbon (s) in water - using bacterial bio-mass on solid carrier |
| 11/07/1990 | EP0396142A1 Process and apparatus for controlling biological processes for phosphor and nitrogen removal in activated sludge plants |
| 11/07/1990 | EP0396057A1 Control arrangement and process for controlling microbiological treatment of waste water |
| 11/07/1990 | EP0328560B1 Mineral substance, process for its manufacture and use thereof |
| 11/06/1990 | US4968427 Process for the biological degradation of complex, non-readily degradable organic wastewater constituents |
| 10/31/1990 | EP0395567A1 Process for the treatment of waste water from food processing plants |
| 10/31/1990 | EP0309474B1 Process and device for large surface-area fine-bubble gasification of liquids |
| 10/31/1990 | DE3914063A1 Removing phosphate from waste water - by activated sludge treatment after pre-incubation of water with recycle sludge in presence of iron oxide precipitant |
| 10/30/1990 | US4966713 Process for the treatment of waste water from food processing plants |
| 10/30/1990 | US4966706 Peracid treatment; free of pathogenic microorganisms |
| 10/30/1990 | US4966705 Aerobic digestion to reduce biological oxygen demand |
| 10/30/1990 | US4966704 Anaerobic process for microbiological purification of sulphur-containing water |
| 10/30/1990 | US4966096 Water purification system and apparatus |
| 10/25/1990 | DE3913225A1 Biological treatment of contaminated ground and surface waters - by withdrawing water, adding nutrient salts and biological treating in fermenter |
| 10/25/1990 | DE3912921A1 Biological water treatment process - has biological purificn. step, sedimentation step and controlled sludge recirculation step |
| 10/23/1990 | US4964885 Reducing dew point; washing, condensating exhaust gases; continuous cycles |
| 10/23/1990 | CA1275510C Integrated biological-adsorption process for treating wastewater |
| 10/18/1990 | WO1990011970A1 Process for removal of organic pollutants from waste water |
| 10/18/1990 | DE3912060A1 Excess carbon di:oxide in oxygenated gas circulating through sewage - is removed by partial gas routing via adsorber |
| 10/18/1990 | DE3911789A1 Verfahren zur biologischen abwasserbehandlung mit hilfe von mikroorganismen A process for biological wastewater treatment using microorganisms |
| 10/17/1990 | EP0392900A1 Process and apparatus for the treatment of a liquid with a gas |
| 10/17/1990 | EP0392041A1 Process and apparatus for treating manure or waste water |
| 10/17/1990 | EP0391895A1 Process for manufacturing fine-structured bodies. |
| 10/17/1990 | CN1009992B Method of supplying air masses and producing jets of water |
| 10/16/1990 | CA1275243C Digester tank with foam control cover |
| 10/12/1990 | WO1990011971A1 Process for the biological treatment of waste water using microorganisms |
| 10/12/1990 | CA2050885A1 Process for the biological treatment of waste water using microorganisms |
| 10/11/1990 | DE3911024A1 Process and plant for reducing the liquid manure volume arising in animal husbandry |
| 10/10/1990 | EP0391521A2 A device having a porous polytetrafluoroethylene tube secured in an apertured wall, and the manufacture thereof |
| 10/10/1990 | EP0391331A1 Reactor for gas-liquid reactions |
| 10/10/1990 | EP0391151A2 Microbial degradation of multiple halogenated aromatic compounds |
| 10/10/1990 | CN1045961A Carriers used as biology growing surface |
| 10/10/1990 | CN1045926A Pool for purifying water |
| 10/10/1990 | CN1009916B Anaerobic purification apparatus for waste-water |