| Patents for C02F 3 - Biological treatment of water, waste water, or sewage (46,453) |
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| 12/24/1991 | US5075007 Biological wastewater purification with a downstream precipitation stage |
| 12/24/1991 | CA2086004A1 Fluid supply device |
| 12/19/1991 | DE4116144A1 Downwards-flow water filter with biological and mechanical filter - where upper biological layer has aeration system made up of removable horizontal pipe array which can be raised and lowered in filter tank |
| 12/18/1991 | EP0462082A2 Method of binding biological catalytic activities to sintered expanded clays and product obtained therefrom |
| 12/18/1991 | EP0461166A1 A method for controlling and/or monitoring biological processes. |
| 12/18/1991 | CN1057041A Deep treatment of waste water from printing and dyeing mill and related apparatus |
| 12/18/1991 | CN1057040A Multi-stage sewage disposal with biological rotating disks |
| 12/17/1991 | US5073311 Multiple-gas-phase liquid treatment apparatus |
| 12/17/1991 | US5073309 Device for dispersion of gas in a liquid phase |
| 12/17/1991 | US5073257 Apparatus for treating water |
| 12/17/1991 | US5073256 Equipment for biological water treatment, in particular for denitrification of raw water to produce potable water |
| 12/16/1991 | WO1991019558A1 Process for the removal of hydrogensulphide (h2s) from biogas |
| 12/16/1991 | CA2064724A1 Process for the removal of hydrogensulphide (h2s) from biogas |
| 12/12/1991 | WO1991018658A1 Filtration apparatus and method |
| 12/11/1991 | EP0460767A1 A process and device for anaerobic fermentation |
| 12/10/1991 | US5071765 Application of multiple enzyme blend to control industrial slime on equipment surfaces |
| 12/10/1991 | US5071755 Biodegradation of aliphatic chloroethylene compounds |
| 12/10/1991 | US5071550 Appartus for cleaning and aeration of open bodies of water |
| 12/09/1991 | WO1991019039A1 Controlled-release microbe nutrients and method for bioremediation |
| 12/08/1991 | CA2044089A1 Process and device for anaerobic fermentation |
| 12/05/1991 | DE4116926A1 Denitrification delivery channel in activated sludge treatment plant - empties waste-water into one of several aeration basins, using quick-opening penstock |
| 12/05/1991 | DE4017825A1 Biological waste water treatment system - using microorganisms on roots of plants by flowing waste water along channels past plants held in frames |
| 12/04/1991 | EP0459444A1 Method and system for in situ decontamination of ground water mixed with hydrocarbons |
| 12/03/1991 | US5069787 Method and apparatus for removing cyanide from a fluid |
| 12/01/1991 | CA2043396A1 Method for removal of metal atoms and explosives from aqueous solution using suspended plant cells |
| 11/29/1991 | CA2017754A1 High-flow rate capacity aerobic biological dehalogenation reactor |
| 11/29/1991 | CA2017752A1 Aerobic biological dehalogenation reactor |
| 11/28/1991 | WO1991017959A1 Process for eliminating nitrates and phosphates in the biological purification of waste water |
| 11/28/1991 | WO1991017805A1 Modular clarifier with integral flocculator |
| 11/28/1991 | DE4016451A1 Removable diffuser assembly for waste-water aeration tank - fixed to carriage travelling along downpipe and is connected to downpipe via special valve |
| 11/27/1991 | EP0458760A1 A process and plant for the biological purification of sewage |
| 11/27/1991 | CN2089474U Steel core roll spring fibre filler |
| 11/27/1991 | CN1056475A Biological hydrolysis process for treating waste water of urea |
| 11/27/1991 | CN1014868B Supporting method for immobilization of microorganism |
| 11/26/1991 | US5068036 Activated sludge process with in situ recovery of powdered adsorbent |
| 11/26/1991 | CA1292424C Structured "wv" packing elements |
| 11/21/1991 | EP0457261A1 Apparatus for purification, for example of contaminated groundwater |
| 11/21/1991 | EP0457094A1 Device for connecting a flat ventilation plate inside a container |
| 11/21/1991 | DE4013779C1 Biological purificn. of waste water - using multistage plant including root chamber basin and feed line fitted with irrigation tube and sedimentation basin |
| 11/21/1991 | DE3448341C2 Microbial effluent treatment |
| 11/19/1991 | CA1292204C Method for enriching water with oxygen |
| 11/14/1991 | WO1991017123A1 Method for removing nitrogen from an aqueous solution |
| 11/14/1991 | WO1991017122A1 Filling body, in particular for biological bodies in waste water purification plants, cooling towers and the like |
| 11/14/1991 | WO1991017119A1 Improved method for solute transfer between solid and liquid phases |
| 11/14/1991 | DE4009806C1 Removing fat and oil in commercial kitchen - by reacting with lipollastic bacteria and pptn. with cation |
| 11/13/1991 | EP0456607A1 Water purification process |
| 11/06/1991 | EP0454864A1 Device for fine foaming |
| 11/05/1991 | US5062958 Method for water purification |
| 11/05/1991 | US5062957 Ion exchange, bacterial denitrification |
| 11/05/1991 | US5062956 Bioremediation of chromium (VI) contaminated aqueous systems by sulfate reducing bacteria |
| 10/31/1991 | WO1991016496A1 Method of controlling and purifying flowout of pesticide and the like in golf links and system therefor |
| 10/31/1991 | WO1991016270A1 Process and apparatus for biological treatment of effluent |
| 10/31/1991 | WO1991016125A1 Device for aerating liquids |
| 10/31/1991 | DE4013552A1 Biological cleaning of contaminated soil - by mixing soil with water and microorganism(s) in rotating aerator reactor vessel which allows large quantities of soil to be cleaned |
| 10/30/1991 | EP0454285A1 Method for cleaning water in bassins for fish culture and fish bassins adapted for it |
| 10/30/1991 | EP0453881A1 Process and apparatus for biological purification of waste water |
| 10/30/1991 | EP0453804A1 Filter for aquarium |
| 10/30/1991 | EP0442946A4 Solar aquatic method and apparatus for treating waste |
| 10/30/1991 | EP0266425B1 Aeration type water treatment plant |
| 10/30/1991 | CN1014512B Circulating water jet aeration facility for iron and manganese removal from the underground water |
| 10/29/1991 | US5061378 Sludge transfer systems and methods |
| 10/29/1991 | US5061377 Effectively dissolving, dispersing and reacting oxygen gas of low solubility in water with a substance in aqueous medium |
| 10/29/1991 | US5061368 System for treating waste water by nitrification |
| 10/29/1991 | CA1291583C Ejector for the co- process in neutralization of alkaline waters |
| 10/27/1991 | CA2040696A1 Filter for aquarium |
| 10/24/1991 | DE4012632A1 Appts. for fine-bubble gas-diffusion of liquids - by vertically feeding gas bubbles from pipe onto horizontal rotating plate and arms |
| 10/24/1991 | DE4012631A1 Vorrichtung zum begasen von fluessigkeiten Apparatus for aerating liquids |
| 10/23/1991 | CN1055529A Treatment of waste water of cis-anhydride by anaerobic biological process |
| 10/22/1991 | US5059315 Aquarium water aeration and filtering system |
| 10/20/1991 | WO1991016268A1 System for treating organic wastes and waste water |
| 10/20/1991 | CA2078575A1 Treating system for organic wastes and waste water |
| 10/17/1991 | DE4011853A1 Reducing pollution in water contg. phytoplankton - esp. algae which have removed dissolved nutrients from water, by feeding it to zooplankton |
| 10/16/1991 | EP0452144A1 Fine bubble diffuser system |
| 10/16/1991 | EP0451922A1 Process for the removal of sulfur dioxide from waste gas |
| 10/16/1991 | EP0451430A1 Plant to depollute waste water, particularly water from olive crushers |
| 10/16/1991 | CN1055347A High-efficiency biochemical treatment plant unit for sewage |
| 10/15/1991 | US5057284 Bioslurry reactor for treatment of slurries containing minerals, soils and sludges |
| 10/15/1991 | US5057230 Supplying pressurized liquid streams to venturi to cause turbulence, injecting gas bubbles, shearing to reduce size |
| 10/15/1991 | US5057227 Usin permeable barrier containing peat |
| 10/15/1991 | US5057221 Aerobic biological dehalogenation reactor |
| 10/15/1991 | US5057220 Process for treating waste water |
| 10/15/1991 | US5057213 Apparatus and a system for monitoring impurity in a liquid |
| 10/13/1991 | WO1991016269A1 Process for the treatment of water containing sulphur compounds |
| 10/12/1991 | WO1991015591A1 DEGRADATION OF FERRIC CHELATES BY A PURE CULTURE OF $i(AGROBACTERIUM SP.) |
| 10/12/1991 | WO1991015440A1 Biological system for degrading nitroaromatics in water and soils |
| 10/12/1991 | CA2079899A1 Degradation of ferric chelates by a pure culture of agrobacterium sp. |
| 10/10/1991 | DE4031512C1 Water quality improvement for fish transport container - by feeding to low pressure vessel, removing carbon di:oxide, pumping into pressure vessel and adding oxygen |
| 10/10/1991 | DE4011420A1 Modified biological filter bed - used for removing nitrogen compounds from waste water |
| 10/09/1991 | EP0451031A1 Process for treating recycled waters intented to dilute a paper pulp |
| 10/09/1991 | EP0450047A1 Polymer bead containing immobilized metal extractant |
| 10/09/1991 | EP0449957A1 A method for stimulating biodegradation of halogenated aliphatic hydrocarbons |
| 10/09/1991 | EP0211082B1 Material and method of manufacturing same, and method of protecting normal surfaces and method of constructing normal frames using same material |
| 10/09/1991 | CN1055161A Composite biological fluidized-bed reactor for treatment of starch wastewater |
| 10/08/1991 | US5055204 Tank with air injector for mixing dissolved oxygen into slurry to maintain slurries solids in suspension; trailer for transporting to treatment site |
| 10/08/1991 | US5055193 Biodegradation of halogenated hydrocarbons utilizing ammonia-oxidizing bacterium |
| 10/08/1991 | US5055186 Pellet media to support growth of microorganisms and systems for the utilization of same |
| 10/07/1991 | CA2039838A1 Treatment process of recycled water to be used for diluting pulp |
| 10/02/1991 | EP0449184A1 Method for treatment of liquid manure |
| 10/02/1991 | EP0448973A1 Spiral wound gas permeable membrane module and apparatus and method for using the same |
| 10/02/1991 | CN1014142B Method and apparatus for cleaning sewage contg. phosphate by uqv |