Activated Sludge-Unified System Design and Operation

by Thomas M. Keinath, (M.ASCE), Prof.; Environmental Systems Engrg., Clemson Univ., Clemson, S.C.,
David A. Hofer, Staff Engr.; Dept. of Public Works, New Castle County, Wilmington, Del.,
Caleb H. Dana, Environmental Engr.; Environmental Protection Agency, Region IV, Atlanta, Ga.,
Mark D. Ryckman, Manager; ESE, D.W. Ryckman and Associate, Inc., St. Louis, Mo.,

Serial Information: Journal of the Environmental Engineering Division, 1977, Vol. 103, Issue 5, Pg. 829-849

Document Type: Journal Paper


A unique procedure for designing and operating the activated sludge aeration basin/clarifier system is developed using the settling flux approach. A least-coast design procedure, utilizing batch settling tests and the state point concept, produces a design solution which minimizes capital and operational costs. In addition, the settling flux approach provides the plant operator with a tool for control and operation of the clarifer/thickener to improve treatment efficiencies and prevent operational failures.

Subject Headings: Activated sludge | Aeration | Settling basins | Conceptual design | Assets | Failure analysis

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