Biochemical process for purifying contaminated water
Patent 4746435 Issued on May 24, 1988. Estimated Expiration Date: 
May 24, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 24, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesProcess for purifying waste waters Process and apparatus for waste water treatment Patent #: 4181604 InventorsAssigneeApplicationNo. 06/470138 filed on 02/28/1983US Classes:210/615, Utilizing contact surfaces supporting microorganism (e.g., trickling filter, etc.)210/150, WITH GAS-LIQUID SURFACE CONTACT MEANS210/500.23, Hollow fiber or cylinder210/903, Nitrogenous435/182Enzyme or microbial cell is entrapped within the carrier (e.g., gel, hollow fibre)ExaminersPrimary: Castel, BenoitAttorney, Agent or FirmInternational ClassesC02F 3/30 (20060101)C02F 3/12 (20060101) C02F 3/10 (20060101) C02F 3/20 (20060101) B01D 53/84 (20060101) B01D 53/22 (20060101) Foreign Application Priority Data1980-10-13 JPAbstractA process for treating contaminated water containing BOD sources and nitrogen sources, which comprises supplying oxygen or oxygen-containing gas from one side of a gas-permeable membrane to grow microorganisms including aerobic bacteria and anaerobic bacteria on the other side of the gas-permeable membrane, and performing decomposition of the BOD sources and nitrification and denitrification simultaneously by the action of these microorganisms. Especially good results are obtained when a membrane composed of porous hollow fibers is used as the gas-permeable membrane.Field of SearchUtilizing contact surfaces supporting microorganism (e.g., trickling filter, etc.)Aerobic treatment WITH GAS-LIQUID SURFACE CONTACT MEANS With separator Recirculating to prior step Of separated liquid Of sludge or separated solid To mainstream oxygenation (e.g., activated sludge, etc.) Utilizing specific oxidant, other than air alone (e.g., oxygen-enriched air, ozone, peroxide, etc.) Utilizing mechanical aeration means And anaerobic treatment |
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