04917805 is referenced by 23 patents and cites 11 patents.

A nitrification-denitrification process is disclosed wherein a single flow-through and cyclically operated complete mix activated sludge basin, containing mixed liquor having a mean cell residence time of at least 15 days, is fed with wastewater and discharges treated wastewater to a clarifier while its contents are continuously agitated and cyclically aerated for approximately 3-9 minutes to form an oxic stage and then not aerated for approximately 3-9 minutes to form an anoxic stage. The treated and clarified liquor has ammonia contents no higher than 2.0 mg/l, nitrite contents no higher than 1.0 mg/l, and nitrate contents no higher than 2.0 mg/l. Approximately 99.9% by weight of the discharged sludge from the clarifier is returned to the complete mix basin, the remainder being waste activated sludge.

Cyclical complete mix activated sludge process
Application Number
Publication Number
Application Date
December 20, 1988
Publication Date
April 17, 1990
John H Reid
6 River Oak Pl., Fredericksburg, 22401
Marion P Lelong
C02F 3/30
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