Algorithm for Optimal Activated Sludge Operation

by Patrick W. Hughey, Grad. Student; The Lewis and Clark Law School, Portland, Oregon,
Dale D. Meredith, (M.ASCE), Prof.; Dept. of Civ. Engrg., State Univ. of New York at Buffalo, Buffalo, N.Y.,
Andrew C. Middleton, (A.M.ASCE), Vice Pres.; Environmental Resources, Koppers Co., Inc., Pittsburgh, Pa.,

Serial Information: Journal of the Environmental Engineering Division, 1982, Vol. 108, Issue 2, Pg. 349-366

Document Type: Journal Paper


A method for determining the minimum cost operation of an activated sludge wastewater treatment plant is developed and applied to a plant in Erie County, New York. The plant includes an aerated grit chamber, two aeration basins, two secondary clarifiers, two solids contact clarifiers, a flotation thickener, sand-drying beds, centrifuge, an aerobic digester, two gravity sand filters, and chlorination-reaeration facilities. The complex method of constrained optimization is modified for discrete-valued variables and used with nonlinear cost and process equations to determine the minimum cost operation of the plant for a specified 12-month flow sequence. The results from the optimization are compared with actual operation of the plant.

Subject Headings: Wastewater treatment plants | Sand filters | Algorithms | Activated sludge | Aeration | Clarifiers | Sand (hydraulic) | Sandy soils | New York | United States

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