| Patents for C02F 3 - Biological treatment of water, waste water, or sewage (46,453) |
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| 04/17/1991 | CN1012360B Process for biological purificaiton of waste water |
| 04/17/1991 | CN1012358B Method of treating penicillin waste water |
| 04/17/1991 | CN1012356B Treatment method of drained waste water in antibiotic production |
| 04/11/1991 | DE3932640A1 Controlling efficiency of activated sludge stage of sewage treatment - by incubating sludge sample with relevant substrate and determn. of decrease in substrate or increase in breakdown prod. |
| 04/10/1991 | EP0421483A1 Aqueous stream treatment process |
| 04/10/1991 | EP0421223A1 A process and plant for disposal of organic effluents |
| 04/10/1991 | CN2074766U Air-explosion propeller |
| 04/10/1991 | CN2074765U Comb type self-soft filling device |
| 04/10/1991 | CN1050505A Filter device |
| 04/09/1991 | US5006251 First step of upward flow solid-liquid separator; non-clogging |
| 04/09/1991 | US5006250 In-situ biodegradation of halogenated aliphatic compounds as impurities in underground water supply by microbacteria |
| 04/09/1991 | US5006249 Anaerobic waste water treating process |
| 04/09/1991 | US5006232 Sewage treatment plant |
| 04/04/1991 | WO1991004230A1 Combination type septic tank |
| 04/03/1991 | EP0420415A1 Continuous aeration-batch clarification wastewater treatment |
| 04/03/1991 | CN2074300U Film-trickle-type sheet plug-in filling |
| 04/03/1991 | CN1050368A Anaerobic digestion system |
| 03/27/1991 | EP0418652A1 Aerating device |
| 03/27/1991 | EP0418571A1 Arrangement for the cleaning and aerating of open waters |
| 03/26/1991 | US5002659 Arrangement for cleaning of waste water |
| 03/26/1991 | CA2023637A1 Continuous aeration-batch clarification wastewater treatment |
| 03/26/1991 | CA1282193C Film-flow packing for biological treatment of fluids |
| 03/23/1991 | CA2025986A1 Purification and aeration of open waters |
| 03/22/1991 | CA2005513A1 Oxygenation |
| 03/21/1991 | WO1991003428A1 Absorbent materials and use thereof |
| 03/20/1991 | EP0418121A1 Process for elimination of organic substances and sulphates from waste waters by means of anaerobic fermentation |
| 03/20/1991 | EP0417185A1 A process for removing nitrogen compounds from raw water. |
| 03/20/1991 | EP0417098A1 Method of sewage treatment. |
| 03/20/1991 | CN2073411U Multi-direction split type fillings |
| 03/20/1991 | CN1050012A Process for treating waste water |
| 03/19/1991 | US5000884 Aeration installation |
| 03/19/1991 | US5000853 Process for the improved separation of clarified liquid from biomass in the biological treatment of sewage |
| 03/19/1991 | US5000852 Removal of metal ions from solutions |
| 03/14/1991 | DE4026320A1 Verfahren zur reinigung und aufbereitung von verunreinigtem gut Process for cleaning and treatment of contaminated well |
| 03/13/1991 | CN1011963B Technique and installation of removing iron and manganese in ground-water by method of biological filtration basin |
| 03/12/1991 | US4999302 Biological contact gas scrubber for waste gas purification |
| 03/12/1991 | US4999111 Process for treating wastewater |
| 03/12/1991 | US4999103 Decontamination apparatus mobile water |
| 03/09/1991 | WO1991003429A1 Process and apparatus for a biological reactor to purify water |
| 03/07/1991 | WO1991002701A1 Photoenhanced anaerobic digestion of organic acids |
| 03/07/1991 | WO1991002565A1 Process for purifying and processing contaminated materials |
| 03/07/1991 | DE3929271A1 Device for further purificn. of treated waste water - water from isolated sewage treatment units is cleaned in a biological reaction vessel with internal post-clarifying buffer |
| 03/06/1991 | EP0415403A1 Improved sewage sludge treatment with gas injection |
| 03/06/1991 | EP0415160A1 Process for the microbial degradation of organic materials |
| 03/06/1991 | EP0414957A1 Hydrodynamic bioreactor with submersible chambers |
| 03/06/1991 | EP0414799A1 Method and arrangement for water purification |
| 03/05/1991 | US4997568 Sewage treatment |
| 03/05/1991 | US4997562 Multi-chambered septic tank with elongated partition crossover conduits |
| 03/05/1991 | US4997557 Floating, mixing, aerating and decanting unit |
| 02/28/1991 | DE3937593C1 Aerobic microbial purificn. of contaminated underground water - by drawing up through boreholes, super-saturating with oxygen and additives, feeding to bio-reactor, etc. |
| 02/28/1991 | DE3928255A1 Biological processing of waste or drinking water - by using fixed or vortex bed reactor contg. packing with hardenable biomass film on outer surface |
| 02/28/1991 | CA2003223A1 Treatment of ground water with low level of contaminants |
| 02/27/1991 | EP0414648A1 Wind or wind-photovoltaic power operated oxygenizing device for oxygenizing water |
| 02/27/1991 | EP0414539A1 Method for treating organic waste water by methane fermentation. |
| 02/26/1991 | US4995981 Process for anaerobically degrading highly loaded process waste waters |
| 02/26/1991 | US4995980 Converting organic nitrogen compounds into nitrites and nitrates; using denitrifying bacteria to transform into molecular ox ygen and nitrogen |
| 02/26/1991 | US4995969 Treatment system for landfill leachate |
| 02/22/1991 | CA2023728A1 Wind or wind-photovoltaic power operated oxygenizing device for oxygenizing water |
| 02/21/1991 | WO1991001949A1 A method of degradation of excrement |
| 02/20/1991 | EP0413356A1 Process for treating waste water |
| 02/20/1991 | EP0413027A1 Bioreactor using open-cell porous ceramic carrier |
| 02/20/1991 | CN2071646U Automatic air-float mud discharger |
| 02/20/1991 | CN2071645U Combination packing |
| 02/19/1991 | US4994391 Bacteria culturing system |
| 02/19/1991 | US4994390 Enzyme blend containing cellulase to control industrial slime |
| 02/12/1991 | US4992174 Fixed bed bioreactor remediation system |
| 02/12/1991 | US4992173 Boiler operating method with gases produced from bioreactor |
| 02/12/1991 | US4992165 Sewage treatment plant |
| 02/12/1991 | CA1280227C Fluidized bed reactor for biological treatment of water |
| 02/07/1991 | WO1991001279A1 Immersible biological filter for the purification of waste water |
| 02/06/1991 | CN1011487B Apparatus for increasing putting gaseous medium into liquid medium |
| 02/05/1991 | US4990449 Compost-containing cartridge for biological regeneration of an aquatic medium |
| 02/03/1991 | CA2007615A1 Method of improving the quality of large amount of water and the quantity of dissolved oxygen therein, and apparatus for said improvement |
| 02/02/1991 | WO1991001945A1 Process for separating and/or recovering hydrocarbon oils from water using biodegradable absorbent sponges |
| 02/02/1991 | CA2037925A1 Process for separating and/or recovering hydrocarbon oils from water using biodegradable absorbent sponges |
| 01/30/1991 | EP0410959A1 Device for treating waters in tanks |
| 01/30/1991 | EP0410877A1 Composition for chemical and biological purification of polluted water and process for preparation thereof |
| 01/29/1991 | WO1991001948A1 Process, installation and reactor for biological treatment of waste water |
| 01/29/1991 | US4988443 Permeable, hollow fiber membranes, microorganisms for metabolism of poisons |
| 01/29/1991 | US4988235 System for draining land areas through siphoning from a permeable catch basin |
| 01/29/1991 | CA2059638A1 Process, installation and reactor for biological treatment of waste water |
| 01/24/1991 | DE3923514A1 Rotary reactor for two insol. liq. phases - with inner and outer chambers and jacket of porous material |
| 01/24/1991 | DE3923251A1 Device for removing phosphate(s) from waste water or sewage - by circulating algae parallel to the sewage flow but sepd. from it by water-permeable partition through which the algae cannot pass |
| 01/23/1991 | EP0409367A1 Process and plant for purification of waste water |
| 01/23/1991 | EP0408878A1 Enhanced phosphate removal in an activated sludge wastewater treatment process |
| 01/22/1991 | US4987068 Porous inorganic support spheres which can be cleaned of surface biomass under fluidized bed conditions |
| 01/22/1991 | US4986916 Measurement of concentration of evolved trace gas which is metabolic intermediate or in equilibrium with metabolic intermediate |
| 01/22/1991 | US4986905 Distribution control system for recycling treated sewage water for irrigation |
| 01/17/1991 | DE3921937A1 Submerged water aeration fitting on compressed air conduit - includes rubber non-return valve preventing water entry |
| 01/17/1991 | DE3921936A1 Air delivery slots aerating water from inflatable body - expand during use to increase self-cleaning action |
| 01/16/1991 | EP0408292A2 Vinyl copolymer and adsorbent for microorganisms |
| 01/16/1991 | EP0407597A1 Treatment of activated sludge |
| 01/16/1991 | EP0407404A1 A method for the break-down and recycling of solid urban waste by anaerobic fermentation. |
| 01/15/1991 | WO1991001278A1 Wastewater treatment |
| 01/15/1991 | US4985182 Packing element |
| 01/15/1991 | US4985149 Wet milling pretreatment with glass beads |
| 01/15/1991 | CA2036392A1 Wastewater treatment |
| 01/15/1991 | CA1279131C Oxidation process for substances dissolved or suspended in an aqueous medium |
| 01/10/1991 | DE3921774A1 Sewage treatment basin - has cover sections removable by travelling overhead crane and heated pipes |
| 01/09/1991 | EP0407180A2 Gas-liquid contacting apparatus |