Patent 5037551 Issued on August 6, 1991. Estimated Expiration Date: December 19, 2008. 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.
210/603, Including collecting or storing gas (e.g., fuel, carbon monoxide, etc.)210/610, Including adding ancillary growth medium for microorganism210/617, In bed form210/747, Including geographic feature (e.g., drainage ditch, septic, pond)210/908, Organic210/928, PAPER MILL WASTE (E.G., WHITE WATER, BLACK LIQUOR, ETC.) TREATED435/250, Having five or less carbon atoms435/267Treating animal or plant material or micro-organism
A method and apparatus are disclosed for dehalogenating and further biodegrading organic compounds, including halogenated organic compounds, present in an aqueous mixture, the mixture comprising the waste effluent produced in a continuous high flow rate by an industrial plant such as a bleach pulp or paper mill using chlorine and chlorine compounds. The aqueous mixture is passed through at least one combination of a first oxygen-enriched liquid zone and a second zone containing a mixed population of methylotrophic and heterotrophic microorganisms supported on a substrate bed. A first gas including oxygen is flowed through the first zone and second gas consisting substantially of a low-molecular-weight alkane is flowed through the second zone as the aqueous mixture passes through the first and second zones. The microorganisms supported by the bed dehalogenated and further biodegrade the organic compounds in the aqueous liquid flowing through the bed as they aerobically metabolize the low-molecular-weight alkane. The first zone may be hydraulically coupled to an upstream aerobic biopond for decreasing the total organic carbon and biochemical oxygen demand of the aqueous mixture before the mixture is passed through the first and second zones. A plurality of paired first and second zones may be hydraulically interconnected to achieve a higher degree of dehalogenation and further biodegradation of organic compounds in the aqueous mixture flowing therethrough and/or to accommodate higher flow rates.
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December 19, 2008. 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.
