| Patents for C02F 3 - Biological treatment of water, waste water, or sewage (46,453) |
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| 01/20/1994 | DE4223285A1 Denitrification of waste water with a nitrate content - by mixing with activated sludge and organic sludge |
| 01/20/1994 | CA2139762A1 Process for modulating the concentration of dissolved gases in liquid media |
| 01/20/1994 | CA2138979A1 A method of obtaining lead and organolead from contaminated media using metal accumulating plants |
| 01/19/1994 | EP0578852A1 A sewage well or a small sewage purification plant |
| 01/19/1994 | EP0515570B1 Device for aerobic purification of waste water |
| 01/18/1994 | US5279963 System for the decontamination of a contaminated gas |
| 01/18/1994 | US5279745 Polysulfones impregnated with powdered activated carbo |
| 01/18/1994 | US5279740 Ground contamination remediation process |
| 01/13/1994 | DE4233545C1 Decontamination of soils, muds and solids - by microbial degradation of xeno biotic contaminated substances, ensuring that the oxygen supply is limited and controlling the temp. |
| 01/13/1994 | DE4204681A1 Combined water system - comprises water passing through self-cleaning circuit contg. aquarium, plant irrigation, humidification unit, filter, pump and reservoir |
| 01/12/1994 | EP0578032A2 Sewage treatment plant working process and device for injecting phosphates precipitation products |
| 01/12/1994 | EP0278973B1 Process for the degradation of coal tar constituents by white rot fungi |
| 01/12/1994 | CN1080620A Method for treating organic waste water by non-closing anaerobic compound bed |
| 01/11/1994 | US5278069 Demetallization with biosynthetic sulfuric acid |
| 01/11/1994 | US5277815 In situ biodegradation of groundwater contaminants |
| 01/11/1994 | US5277814 Process for treating organic wastes |
| 01/11/1994 | US5277798 Sewage treatment equipment with activated sludge process bed |
| 01/11/1994 | CA1326078C Process for biologically purifying residual water on a granular bed |
| 01/11/1994 | CA1325988C Process for the degradation of coal tar constituents by white rot fungi |
| 01/06/1994 | WO1994000388A1 Process for lowering the phosphorus content of waste water |
| 01/06/1994 | WO1994000223A1 A nozzle |
| 01/06/1994 | CA2138653A1 A nozzle |
| 01/06/1994 | CA2115353A1 Process for lowering the phosphorous content of waste water |
| 01/05/1994 | EP0577552A1 Surface centrifugal aerator and its application for aeration of liquid |
| 01/05/1994 | EP0576895A2 Process for the microbial degradation of substituted aromatic compounds |
| 01/05/1994 | DE4240949C1 Belüftungseinrichtung Aeration device |
| 01/05/1994 | DE4227238C1 Sewage purificn. plant operation - uses heat from compressed air flow for hot water supplies in circuit for reheating to cut energy consumption |
| 01/05/1994 | DE4221867A1 Biological treatment of waste water - using excess sludge as carbon source after processing by cell wall disintegration |
| 01/05/1994 | DE4221845A1 water surface aeration esp. in sewage purificn. - using unit to break down solids directly before entry for water into spinner |
| 01/05/1994 | DE4221370A1 Improving plant clearing beds root removal units and filter beds - by piling up to produce zones with aerobic conditions and redn. in surface requirement |
| 01/05/1994 | DE4221358A1 Water aeration for drinking or waste water system - has stretched elastomer plate with fine slits in frame to allow slits to open and close and return to original state |
| 01/05/1994 | DE4221356A1 Water aeration tube - has slitted elastomeric cover round its upper half held by frame secured by nails or staples driven home |
| 01/05/1994 | DE4220595A1 Solid-liquid mixing appts. - has a waisted section at inner and outer containers for effective mixture of organic solids |
| 01/05/1994 | CN1080235A Corrugated sheet assembly |
| 01/04/1994 | US5276216 Process for oxidizing aromatic and aliphatic compounds |
| 01/04/1994 | US5275943 Inner core of dehydrated bacterial cysts; inner coating of water-soluble hydroxypropyl methylcellulose; outer layer of sodium sulfate coated sodium carbonate peroxyhydrate particles |
| 01/04/1994 | US5275735 Method and apparatus for dissolving gas in liquid, e.g., in wastewater collection and transmission systems |
| 01/04/1994 | US5275734 Chemical pre-treatment and biological destruction of propylene carbonate waste streams effluent streams to reduce the biological oxygen demand thereof |
| 01/04/1994 | US5275732 Water treatment |
| 01/04/1994 | US5275722 Oxidation ditch wastewater treatment and denitrification system |
| 12/29/1993 | EP0575695A2 Flat, biodegradable carrier material for denitrificants in biological sewage plants |
| 12/29/1993 | EP0575567A1 Wastewater treatment process. |
| 12/29/1993 | EP0575456A1 Method for the treatment of the sewages and respective plant. |
| 12/29/1993 | EP0575314A1 Method and reactor for purification of water. |
| 12/29/1993 | EP0483290B1 Immersible biological filter for the purification of waste water |
| 12/29/1993 | EP0442946B1 Solar aquatic method and apparatus for treating waste |
| 12/29/1993 | CN2151146Y Central unit of photosynthetic bacterium cultivater for treating organic waste liquid |
| 12/29/1993 | CN1079946A Method and unit for waste water treament petro-chemical industry |
| 12/29/1993 | CN1079921A Apparatus for treatment of liquids of different specific gravities or treatment of gas and liquids |
| 12/29/1993 | CN1023310C Method for treating waste water containing discards from filature |
| 12/28/1993 | US5273665 Water filtration device |
| 12/28/1993 | US5273653 Containing emerse helophyte plants |
| 12/23/1993 | WO1993025485A1 System and process for purifying waste water which contains nitrogenous compounds |
| 12/23/1993 | WO1993025484A1 Fluid diffuser |
| 12/23/1993 | WO1993025483A1 Treatment installation and method for treating water and/or gases |
| 12/23/1993 | WO1993025482A1 Liquid distribution mechanism |
| 12/23/1993 | WO1993025480A1 Method for aiding microbial degradation of spilled oil |
| 12/23/1993 | CA2137802A1 Treatment installation and method for treating water and /or gases |
| 12/23/1993 | CA2137546A1 Fluid diffuser |
| 12/22/1993 | EP0575294A1 Process for preparing-hydrolytically stable trivalent phosphorus compounds and their use as stabilisators for thermoplastic materials |
| 12/22/1993 | EP0575052A1 Combined metals and carbonaceous components removal in a biophysical treatment system |
| 12/22/1993 | EP0575002A1 A system for the aerobic purification of wastewater |
| 12/22/1993 | EP0574495A1 Method for cleaning of heat exchangers. |
| 12/21/1993 | US5271912 Enzymatic processing of materials containing chromium and protein |
| 12/21/1993 | US5271845 Aerobic biological process for treating waste sludges |
| 12/21/1993 | US5271844 Processes for the alkaline biodegradation of organic impurities |
| 12/21/1993 | US5271832 Activation plant with funnel-shaped secondary sedimentation |
| 12/21/1993 | US5271831 Selenate removal from waste water |
| 12/21/1993 | US5271829 Treatment system for waste water |
| 12/20/1993 | CA2095804A1 Combined metals and carbonaceous components removal in a biophysical treatment system |
| 12/15/1993 | EP0573835A2 Process for producing a basic material |
| 12/15/1993 | EP0573626A1 A reactor. |
| 12/15/1993 | CN2149389Y Composition equipment for wastewater treatment |
| 12/15/1993 | CN1079449A Nethod for removing sulphur compounds from water |
| 12/14/1993 | US5269929 Sulfate reducing bacteria and anaerobic heterotroph |
| 12/14/1993 | US5269911 Wastewater treatment |
| 12/09/1993 | WO1993024612A1 Improved mixture of nutrients for the bioremediation of polluted soils and waters |
| 12/09/1993 | WO1993024418A1 Method for processing liquide manure |
| 12/09/1993 | WO1993024417A1 Reactor for the biological treatment of water |
| 12/09/1993 | WO1993024416A1 Process for removing sulphur compounds from water |
| 12/09/1993 | WO1993024415A1 Floating biological contactor |
| 12/09/1993 | WO1993022240A3 Biogas reactor |
| 12/09/1993 | DE4218243A1 Verbesserte Nährstoffgemische für die Bioremediation verschmutzter Böden und Gewässer Improved nutrient mixtures for the bioremediation of contaminated soils and waters |
| 12/09/1993 | DE4216357C1 New denitrifying bacterium - useful for degrading explosive nitrate ester(s) after alkaline hydrolysis |
| 12/09/1993 | CA2137352A1 Improved nutrient mixtures for the bioremediation of polluted soils and waters |
| 12/08/1993 | EP0573226A1 Biocatalyst-immobilized electrode and method for treatment of water by use of the electrode |
| 12/08/1993 | CN1079111A Method for treatment of potato fruit water |
| 12/07/1993 | US5268094 Wastewater processing apparatus |
| 12/07/1993 | CA1324879C Pipeline reactor and method |
| 12/03/1993 | CA2070247A1 Process for the biological treatment of water by nitrificationand denitrification |
| 12/03/1993 | CA2070246A1 Process and installation for the biological treatment of manure |
| 12/03/1993 | CA2070245A1 Process and apparatus for the biological treatment of water effluents, including denitrification |
| 12/02/1993 | DE4317197A1 Sewage denitrification using two-stage biological purificn. assembly - in which additive contg. carbon@ from supply tank is fed directly before entry to denitrification basin |
| 12/01/1993 | CN2148074Y Automatic air discharging device for iron-removing filtering tank |
| 11/30/1993 | US5266297 Liquid oxidizing method and apparatus |
| 11/30/1993 | US5266239 Diffuser assembly for an aeration system of a wastewater treatment plant |
| 11/30/1993 | US5266201 Process for the purification of aqueous solutions polluted by nitrate ions |
| 11/30/1993 | US5266200 Cyclically aerating to form aerobic cycles at high dissolved oxygen levels and anoxic cycles at low levels; efficient operation under varying conditions |
| 11/30/1993 | US5265674 Enhancement of in situ microbial remediation of aquifers |
| 11/30/1993 | CA1324844C System for purification of phosphate-containing sewage |