Method for biological cleaning of wastewater

Details Method for biological cleaning of wastewater Method for biological cleaning of wastewater

2005-09-20

2005-09-20

Barry, Chester T. (Department: 1724)

Liquid purification or separation

Processes

Treatment by living organism

C210S622000, C210S610000

Reexamination Certificate

active

06946074

ABSTRACT:
A method for biological purification of wastewater is disclosed, wherein the wastewater is purified in a biofilm process followed by an activated sludge process. The biological degradation in the biofilm process is performed under limitation of one of the nutrient salts nitrogen or phosphorous, and the surplus sludge from the biofilm process is allowed to pass to the activated sludge process.

REFERENCES:
patent: 4999111 (1991-03-01), Williamson
patent: 5976375 (1999-11-01), Dorica et al.
patent: 0776863 (1997-06-01), None
patent: 51020471 (1976-02-01), None
patent: 6190396 (1994-07-01), None
patent: WO 9839254 (1998-09-01), None

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