| Patents for C02F 3 - Biological treatment of water, waste water, or sewage (46,453) |
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| 10/10/1990 | CA2014030A1 Process for removal of organic pollutants from waste water |
| 10/09/1990 | US4961857 Pressure release produces fine mist of minute bubbles; water purification |
| 10/09/1990 | US4961854 Homogeneously mixing by injecting oxygen-containing gas into lower portion of aeration zone through fine bubble diffusers |
| 10/09/1990 | US4961670 For containing liquid materials |
| 10/09/1990 | US4961400 Rotating brush aeration system |
| 10/04/1990 | WO1990011255A1 Floating aquatic plant water treatment system |
| 10/04/1990 | WO1990011254A1 Device for purifying waste water |
| 10/04/1990 | DE3905228C1 Process for disinfection and aerobic stabilisation of sewage sludge |
| 10/03/1990 | EP0390575A1 Aerobic waste sludge digester-thickener orbital system and method |
| 10/03/1990 | EP0390265A1 Process for purifying waste waters constituted by civil, industrial, agroalimentary, and zootechnical waste waters, and facility for practicing it |
| 10/03/1990 | EP0389958A1 Process for biochemical treatment of water |
| 10/03/1990 | CN1009822B Process and apparatus for removing sulphates from waste water |
| 10/03/1990 | CA2013450A1 Microbial degradation of polyhalogenated aromatic hydrocarbons |
| 10/02/1990 | US4960512 Apparatus for sludge thickening |
| 10/02/1990 | CA1274926A1 Apparatus for anaerobic treatment of waste water |
| 10/02/1990 | CA1274925A1 Removing selenium from water |
| 09/27/1990 | DE3909027A1 Plant for the mechanical and biological purification of waste water |
| 09/26/1990 | EP0389248A1 Intrachannel clarifier |
| 09/26/1990 | EP0389230A2 Dissolution of gas |
| 09/26/1990 | CN2062728U Integrated biochemistry processor for sewage |
| 09/25/1990 | US4959315 Biodegradation of chloroethylene compounds |
| 09/25/1990 | US4959145 Gas baffle device for on-site waste disposal systems |
| 09/25/1990 | US4959084 Combined air and water pollution control system |
| 09/25/1990 | CA1274442A1 Slime control in industrial waters using enzymes |
| 09/20/1990 | WO1990010601A1 Biodegradation of tce utilizing nitrosomonas bacteria |
| 09/20/1990 | WO1990010600A1 Process for biological removal of phosphates |
| 09/20/1990 | DE3908988A1 Process and apparatus for treating a waste water by the activation method with biological elimination of phosphorus |
| 09/20/1990 | DE3908919A1 Process and apparatus for biological elimination of phosphates from waste waters |
| 09/20/1990 | DE3908162A1 Device for supplying a sewage treatment plant with compressed air |
| 09/20/1990 | CA2012450A1 Method of fluid aeration and equipment used for this method |
| 09/20/1990 | CA2011332A1 Intrachannel clarifier |
| 09/19/1990 | EP0388115A1 Controlling industrial slime |
| 09/19/1990 | EP0388066A1 Dispersed air flotation apparatus and method |
| 09/19/1990 | EP0250475B1 Method and plant for the recovery of energy from waste and residues |
| 09/19/1990 | EP0216872B1 Device for the continuous introduction or extraction of gases into/from liquids |
| 09/19/1990 | CN2062331U Ball shape filling material |
| 09/19/1990 | CN1045381A Apparatus and process for treatment of wastewater |
| 09/18/1990 | US4957868 Cylindrical hollow carriers for microorganisms made of nonwoven fabric |
| 09/18/1990 | CA1274326A1 Hollow reactor for biological waste-water purification |
| 09/18/1990 | CA1274325A1 Plant for the anaerobic purification of waste water |
| 09/18/1990 | CA1274188A1 Device for the recapture of water in a granular material filter bed |
| 09/14/1990 | WO1990010602A1 Bioslurry reactor for treatment of slurries containing minerals, soils and sludges |
| 09/14/1990 | CA2050296A1 Bioslurry reactor for treatment of slurries containing minerals, soils and sludges |
| 09/13/1990 | DE3918259C1 Electron scanning tunnel microscope - has emitter needle next to specimen within micro-electrically adjustable carrier movable in three directions |
| 09/13/1990 | DE3906943A1 Process for waste water purification and activated sludge plant for carrying out the process |
| 09/13/1990 | CA2001539A1 Application of cellulase to control industrial slime |
| 09/13/1990 | CA2001538A1 Application of glucanase to control industrial slime |
| 09/12/1990 | EP0387241A2 Process and device for introducing gas into liquids |
| 09/12/1990 | EP0386560A1 Process for the biological elimination of phosphates |
| 09/12/1990 | EP0386163A1 Process for separation. |
| 09/11/1990 | US4956100 Water pollution, removing floating matter |
| 09/11/1990 | US4956094 Water treatment, oxygen demand, sludge, aerobic process |
| 09/11/1990 | US4956093 Water treatment, active carbon, circulation, loops |
| 09/11/1990 | US4956092 Method for concentrating/dehydrating of sewage sludge |
| 09/11/1990 | US4956082 Centrifugal bio-contactor apparatus |
| 09/11/1990 | US4956080 High pressure oxygen-saturated water treatment apparatus |
| 09/11/1990 | US4955586 Apparatus for treating slurry by gas-liquid contact method |
| 09/09/1990 | WO1990010603A1 Apparatus and method for stabilizing sludge |
| 09/09/1990 | CA2049057A1 Apparatus and method for stabilizing sludge |
| 09/09/1990 | CA2011723A1 Biodegradation of halogenated hydrocarbons utilizing ammonia-oxidizing bacterium |
| 09/07/1990 | WO1990010083A1 A method for controlling and/or monitoring biological processes |
| 09/07/1990 | WO1990009966A1 Treatment of activated sludge |
| 09/07/1990 | WO1990009965A1 Process and installation for the biological removal of phosphate contaminants from waste water |
| 09/06/1990 | DE3906942A1 Process for waste water purification and sewage treatment plant for carrying out the process |
| 09/05/1990 | EP0385965A1 Device for fine bubble aeration of waste water |
| 09/05/1990 | EP0385555A1 Apparatus for carrying out a combined air and water purification, and also a method for operating such a purification |
| 09/05/1990 | EP0385198A1 Device for water and waste water aeration |
| 09/05/1990 | EP0385011A1 Liquid treatment devices and methods |
| 09/05/1990 | CN1045083A Method and apparatus for disposing waste water by biological fluidized bed with sponge carrier |
| 09/04/1990 | US4954296 Gas injection equipment |
| 09/04/1990 | US4954258 Microbiological degradation of halogenated hydrocarbons in water |
| 09/04/1990 | US4954257 Biological purification loop device and method having deflector plate within guide pipe |
| 09/04/1990 | CA1273720A1 Deep submergence rotating biological contactor apparatus |
| 09/04/1990 | CA1273719A1 Vertical looped reactor tank with delayed air release factor |
| 09/04/1990 | CA1273718A1 Reactor piping and flow control system |
| 08/30/1990 | DE3905753A1 Process and device for the denitrification of water |
| 08/29/1990 | EP0384162A1 Process for the disinfection and aerobic stabilisation of sewage sludge |
| 08/29/1990 | EP0383789A1 A process for in situ biodegradation of hydrocarbon contaminated soil. |
| 08/29/1990 | EP0383765A1 Sewage treatment plant. |
| 08/28/1990 | US4952316 Continuous aeration-batch clarification wastewater treatment |
| 08/28/1990 | US4952315 Method, system and emulsifier substance for treatment of materials containing harmful substances |
| 08/28/1990 | US4952310 Intrachannel clarifier |
| 08/28/1990 | US4951606 Fish tank for intensive fish fattening and process for operating such a fish tank |
| 08/23/1990 | WO1990009351A1 Process and device for purifying liquids |
| 08/23/1990 | DE4004777A1 Production of heat by oxidising petroleum or other fossil material - used as nutrient medium for genetically manipulated organisms |
| 08/22/1990 | EP0383674A1 Process and installation for the biological treatment of waste water containing nitrogen, especially for nitrification and/or denitrification |
| 08/22/1990 | EP0383648A1 Apparatus for distributing and diffusing gas in a liquid containing or not granular material, and bioreactor provided with such apparatus |
| 08/22/1990 | EP0383524A1 Fluid treatment |
| 08/22/1990 | EP0383156A1 Process for eliminating phosphates and organically bound phosphorus from waste and feed waters |
| 08/22/1990 | EP0383109A1 Use of bark mulch for the reduction of the nitrate content in ground and drinking water or surface water |
| 08/21/1990 | US4950407 Method for the treatment of sewage |
| 08/21/1990 | US4950406 Flow adjusting vane for intra-channel clarifier |
| 08/21/1990 | US4950396 Biological sewage treatment plant |
| 08/16/1990 | EP0382579A1 An effluent treatment system |
| 08/16/1990 | EP0382340A1 Two-stage anaerobic/aerobic wastewater treatment process |
| 08/16/1990 | DE4000834A1 2 stage brewery wastes treatment - comprises hydrolysis and methano genesis |
| 08/16/1990 | DE3904262A1 Sludge drying plant to be operated in particular together with a biogas plant |
| 08/16/1990 | DE3904104A1 Lifting apparatus for surface aeration systems of sewage treatment plants |
| 08/16/1990 | DE3904103A1 Distributor apparatus for the uniform distribution of waste water |
| 08/16/1990 | DE3904072A1 Verfahren und vorrichtung zur reinigung von fluessigkeiten Method and device for purifying liquids |