Considerations in Modeling Activated Sludge Process

by Gerald E. Speitel, Jr., (A.M.ASCE), Grad. Student; Dept. of Environmental Sci. and Engrg., Univ. of North Carolina, Chapel Hill, N.C. 27514,
Michael M. Hughes, (A.M.ASCE), Project Engr.; Malcolm Pirnie, Inc., 2 Corporate Park Drive, White Plains, N. Y. 10602,

Serial Information: Journal of the Environmental Engineering Division, 1982, Vol. 108, Issue 5, Pg. 990-1002

Document Type: Journal Paper


Mathematical modeling of the activated sludge process is examined both from a unit process viewpoint and as an integral component of plant-wide mass balance models. Two modeling approaches are reviewed. The first is a standard approach now commonly used in practice. The second is an alternative approach which represents a modification of the first to directly account for influent suspended solids to the activated sludge process. Considerations are presented as to the proper application of both models in the prediction of waste sludge production and mixed liquor concentration. The two approaches also are compared for utility in wastewater treatment plant design. The alternative approach may be more flexible in accounting for sludge handling recycle loads. In many instances it also provides a more conservative estimate of waste sludge production.

Subject Headings: Mathematical models | Activated sludge | Wastewater treatment plants | Waste management | Recycling | Integrals | Influents | Turbidity

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