Method and device for purifying wastewaters

Details Method and device for purifying wastewaters Method and device for purifying wastewaters

2007-02-13

2007-02-13

Barry, Chester T. (Department: 1724)

Liquid purification or separation

Processes

Treatment by living organism

C210S609000, C210S620000, C210S628000, C210S196000, C210S197000, C210S745000

Reexamination Certificate

active

10490250

ABSTRACT:
The invention relates to a method for purifying wastewaters, particularly wastewaters produced in the paper industry, involving the following steps: a) aerobic clarification of the wastewater using activated sludge in an activation stage; b) carrying out, in a secondary settling tank, a subsequent clarification of a portion of the wastewater/activated sludge mixture leaving the activation stage; c) desiccating, in a desiccation unit, another portion of the wastewater/activated sludge mixture leaving the activation stage; d) returning at least a portion of the activated sludge removed in steps b) and c) into the activated sludge tank.

REFERENCES:
patent: 3892659 (1975-07-01), Kirk
patent: 4083785 (1978-04-01), Bernard et al.
patent: 5554289 (1996-09-01), Grounds
patent: 5824222 (1998-10-01), Keyser et al.
patent: 43 26 603 (1995-02-01), None
patent: 61061699 (1986-03-01), None
Patent Abstracts of Japan, vol. 012, No. 127, May 21, 1988, Hitachi Plant Eng. & Constr. Co. Ltd., Abstract.
Patent Abstract of Japan, vol. 010, No. 226, Aug. 7, 1986, Ebarra Infilco Co. Ltd., Abstract.
Patent Abstracts of Japan, vol. 011, No. 003, Jan. 7, 1987, Kurita Water Ind. Ltd., Abstract.
Bradke, Hans-Joachim, “Abwasserreinigung: Leistungubersicht der Anlagenhersteller in der Bundesrepublik Deutschland”, 1982.

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