Cost Interactions in Activated Sludge Systems

by Michael K. Stenstrom, (A.M.ASCE), Asst. Prof.; Engrg. Systems Dept., Univ. of California, Los Angeles, Los Angeles, Calif.,
John F. Andrews, (M.ASCE), Prof.; Dept. of Civ. Engrg., Univ. of Houston, Houston, Tex.,

Serial Information: Journal of the Environmental Engineering Division, 1980, Vol. 106, Issue 4, Pg. 787-796

Document Type: Journal Paper


Using a dynamic mathematical model, it is shown that the partial operation cost of an activated sludge plant can vary as much as several thousand dollars per week depending upon mean cell retention time. It is shown that the least cost operating strategy will depend on sludge disposal cost, oxygen transfer cost, and digester gas value. Of key importance is operation flexibility which can allow treatment system operation at various mean cell retention times. Digester gas value can be a significant factor in determining least cost operating strategy.

Subject Headings: Activated sludge | Dynamic models | Mathematics | Mathematical models | Oxygen transfer | Retaining structures | Natural gas

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