Anoxic-Aerobic Activated Sludge Treatment

by H. D. Stensel, Univ of Washington, Seattle, United States,
O. E. Albertson, Univ of Washington, Seattle, United States,
P. Hendricks, Univ of Washington, Seattle, United States,
D. Wendell, Univ of Washington, Seattle, United States,
P. Petryk, Univ of Washington, Seattle, United States,



Document Type: Proceeding Paper

Part of: Environmental Engineering

Abstract: An activated sludge system was operated at a relatively low SRT of 1-2 days at the City of Phoenix to meet secondary treatment requirements. Operating MLSS concentrations were 400-600 mg/L and SVI values were usually over 200 ml/gr. New treatment needs prompted full scale plant modifications to investigate an anoxic-aerobic operation. The modification resulted in improved effluent quality including ammonium and nitrate nitrogen concentrations of less than 1.0 and 5.0 mg/L, respectively, an SVI of less than 100 ml/gr, a higher operating SRT of 8-10 days, and improved oxygen transfer efficiency so that no additional air supply was needed to meet nitrification oxygen needs.

Subject Headings: Activated sludge | Oxygen transfer | Aerobic processes | Air quality | Nitrates | Effluents | Urban areas | Ammonia | Arizona | North America | Phoenix | United States

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