| Patents for C02F 3 - Biological treatment of water, waste water, or sewage (46,453) |
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| 10/01/1991 | US5053142 Method for treating polluted material |
| 10/01/1991 | US5053060 Analyzer consists of two blocks with gas-permeable membrane compressed between, first block has channel for carrying liquids, second block has venting holes |
| 10/01/1991 | CA1289848C Throttling device, method for using the throttling device and also device for using the method |
| 09/28/1991 | CA2014229A1 Biological effluent treatment station |
| 09/26/1991 | DE4009249A1 Filter medium for purificn. of effluent waters etc. |
| 09/25/1991 | EP0447667A1 Reactors for waste water purification with apparatus for recycling of solids |
| 09/25/1991 | CN1014046B Improvement of anaerobic ferment devices and methods |
| 09/24/1991 | US5051365 Marine amoebae for digesting cell walls |
| 09/24/1991 | US5051193 Waste water treatment process |
| 09/24/1991 | US5051184 Oxidizing enzymes with lower oxidative substrate such as hydrogen peroxide |
| 09/23/1991 | WO1991014657A1 Process and installation for purifying waste water |
| 09/23/1991 | CA2077685A1 Process and installation for purifying waste water |
| 09/23/1991 | CA2038567A1 Device for solids recycle in longitudinal-flow fluid-bed reactors for effluent treatment with carrier particles |
| 09/19/1991 | DE4008676A1 Appts. for aerobic treatment of waste water - using oxidising agent and shearing machine rotor-stator |
| 09/18/1991 | EP0447291A1 Method and composition for processing manure |
| 09/18/1991 | EP0446926A1 Apparatus for waste water clarification |
| 09/18/1991 | EP0446542A1 Activator composition for septic tanks |
| 09/18/1991 | CN2084934U 地下式自动污水净化装置 Automatic underground sewage purification device |
| 09/17/1991 | US5049320 Gas dissolving system and method |
| 09/17/1991 | US5049266 Device and method for microbiological water treatment |
| 09/17/1991 | US5049265 Effluent treatment system |
| 09/17/1991 | CA1289275C Method for anaerobic treatment of high strength liquors |
| 09/12/1991 | DE4106291A1 Controlled removal of sewage sludge from tank edge - with automatic allowance for different initial levels |
| 09/12/1991 | DE4007478A1 Breaking down of volatile organic pollutant(s) - by combined action of photo-synthetically active algae sharing reactor cavity with pollutant selective bacteria |
| 09/11/1991 | EP0446192A1 A device for turbine aerators |
| 09/11/1991 | EP0446036A2 Control apparatus |
| 09/11/1991 | EP0445224A1 Method for degradation of halogenated hydrocarbons using a methane-oxidizing bacterium, which produces methane monooxygenase |
| 09/11/1991 | EP0445203A1 Packing in or for a vessel. |
| 09/11/1991 | EP0445169A1 Liquid-gas mixing device |
| 09/11/1991 | EP0445165A1 Flow discharge valve. |
| 09/11/1991 | EP0432206A4 Wastewater treatment system |
| 09/11/1991 | CN1054407A Method and apparatus for purifying sewage containing excrements and urine |
| 09/10/1991 | US5047152 Clostridium with carbon and nitrogen sources |
| 09/10/1991 | CA2038427A1 Control apparatus |
| 09/08/1991 | CA2011747A1 Process for sludge reduction in an aerobic sludge generating waste treatment system |
| 09/05/1991 | WO1991013036A1 Process for purification of waste water |
| 09/05/1991 | WO1991013035A1 Biological process for denitrification of liquid media and apparatus for implementing said process |
| 09/05/1991 | WO1991013034A1 Method and apparatus for recirculation of liquids |
| 09/05/1991 | WO1991013033A1 Device for aerobic purification of waste water |
| 09/05/1991 | CA2076981A1 Method and apparatus for recirculation of liquids |
| 09/04/1991 | EP0445043A1 Biological process for the denitrification of liquid media and apparatus for carrying out the process |
| 09/04/1991 | EP0444585A2 Clarification vessel |
| 09/04/1991 | CN2084050U Oversleeve type micropore aerator |
| 09/04/1991 | CN1013767B A process for the biological purification of sewage and a device for carrying out such a process |
| 09/04/1991 | CN1013766B Device for preventing pipe of air diffuser from cloggling |
| 09/03/1991 | US5045202 Centrifugal oxygenator for treatment of waste water and system |
| 09/03/1991 | CA1288531C Method for preventing the bulking of activated sludge |
| 08/29/1991 | DE4005975A1 Combined aerobic-anaerobic bacterial treatment of sewage - in controlled pressure conditions for liq. manure or fish-rearing water tanks |
| 08/28/1991 | EP0442946A1 Solar aquatic method and apparatus for treating waste. |
| 08/27/1991 | US5043104 Apparatus for gas absorption in a liquid |
| 08/27/1991 | US5043061 Evaporation and emanation type wastewater treating apparatus |
| 08/22/1991 | WO1991012208A1 Treatment of wastewater |
| 08/22/1991 | WO1991012207A1 Biological disposal of oxalates |
| 08/22/1991 | DE4004961A1 Continuously operating settlement tank - has submerged motor with propeller blades on hinged vertical arm able to swing above bridge for maintenance |
| 08/22/1991 | DE4004476A1 Two=stage purification of waste water - with aeration or oxygen loading in each stage, controlling redox potential in first stage |
| 08/22/1991 | DE4002694A1 Divided gas supply into fish repairing tank - ensures healthy balance between nitrogen and oxygen |
| 08/21/1991 | EP0442337A1 Process for biological purification of waste water |
| 08/21/1991 | EP0442157A1 A method for the purification of contaminated water and apparatus for carrying out said method. |
| 08/21/1991 | EP0442110A1 Process for biological purification of waste air with a trickle filter system |
| 08/21/1991 | EP0336929B1 Method for water purification |
| 08/21/1991 | EP0325643B1 Apparatus for anaerobic treatment of waste water |
| 08/20/1991 | US5041217 Used for waste water treatment, pollution control |
| 08/20/1991 | US5041216 Fluidized bed reactor for biological purification of effluent |
| 08/15/1991 | CA2036245A1 Process for biologically purifying waste waters |
| 08/14/1991 | EP0441103A1 Process and installation for the degradation of impurities in waters originating from olives-treating plants |
| 08/14/1991 | EP0440996A1 Aerobic wastewater treatment with alkalinity control |
| 08/14/1991 | EP0440773A1 Photoenhanced anaerobic digestion of organic acids |
| 08/14/1991 | EP0267962B1 Bacterial composition and method for purifying water and soil of oil pollution |
| 08/13/1991 | US5039416 Process for the purification of industrial waste-waters |
| 08/13/1991 | US5039415 Dispersing liquid mixture of bacteria and water into soil particlate stream; accuracy, in situ, pollution control |
| 08/13/1991 | US5039414 Process for separating and/or recovering hydrocarbon oils from water using biodegradable absorbent sponges |
| 08/13/1991 | US5039404 Oxygen permeable membrane used in wastewater treatment |
| 08/11/1991 | CA2035512A1 Process for biological waste air purification by means of a percolation system |
| 08/08/1991 | WO1991011392A1 Method of cleaning soil water |
| 08/08/1991 | WO1991011243A1 Device for purifying sewage |
| 08/08/1991 | DE4003487A1 Anaerobic breakdown of sludge in digestion tank - with aerobic-anaerobic pre-treatment |
| 08/07/1991 | EP0439890A1 System for draining land areas |
| 08/07/1991 | EP0439610A1 Gas-containing settling tank |
| 08/06/1991 | US5037688 Material for protecting a slope surface and for water treatment and contact purposes |
| 08/06/1991 | US5037551 High-flow rate capacity aerobic biological dehalogenation reactor |
| 08/06/1991 | US5037550 Biological contactor for purifying water to produce drinking water and associated control method |
| 08/06/1991 | US5037240 In-situ soil treatment process |
| 08/01/1991 | DE4101245A1 Biological pretreatment of substrate, esp. for bio:gas plant - with redn. of biological oxygen demand and breakdown of solids |
| 08/01/1991 | DE4006689A1 Determining the quality of waste waters - where characteristics of water are continuously measured in non-invasive manner and computer compares measured values with pre-set limits |
| 08/01/1991 | DE4002090A1 Treating eutrophic stagnant surface water - by covering the sediment with a semipermeable film to encapsulate pptd. phosphate |
| 07/31/1991 | CN2081840U Down-flow water distributor of anaerobic fluid bed |
| 07/31/1991 | CN2081839U Underwater stirrer |
| 07/31/1991 | CN2081838U High-efficency filling for sewage treatment |
| 07/31/1991 | CN1053415A Float aerator |
| 07/31/1991 | CN1013360B Process and device for anaerobic decomposition of organic substrate |
| 07/30/1991 | US5036012 Biodegradation of liquid scintillation cocktails |
| 07/30/1991 | US5035795 Modular clarifier with integral flocculator |
| 07/30/1991 | CA2074840A1 Sewage purification apparatus |
| 07/30/1991 | CA2074829A1 Method for purifying sewage |
| 07/30/1991 | CA2008870A1 Method for treating contaminated soil and groundwater by in situ subsurface bioreclamation |
| 07/25/1991 | WO1991010847A1 Drive system |
| 07/25/1991 | WO1991010723A1 Bacteriolytic enzyme native to a nocardiopsis strain, its production and use. |
| 07/25/1991 | WO1991010624A1 System and method for treating sewage or other fluids |
| 07/25/1991 | DE4100804A1 Rapid removal of cyanide from ground-water - by aeration, enrichment with nutrients, filtration then return to the soil |
| 07/25/1991 | DE4001855A1 Biological treatment of organically contaminated aq. liq. - using biomass filtration and composting system modified by addn. of anaerobic fixed filter reducing molecular nitrogen |