Cyclical complete mix activated sludge process

Details Cyclical complete mix activated sludge process Cyclical complete mix activated sludge process

1988-12-20

1990-04-17

Hruskoci, Peter

Liquid purification or separation

Processes

Treatment by living organism

210628, 210630, 210903, C02F 330

Patent

active

049178059

ABSTRACT:
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.

REFERENCES:
patent: 3342727 (1967-09-01), Bringle
patent: 4618426 (1986-10-01), Mandt
patent: 4655925 (1987-04-01), Tabata et al.

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