Simulation Modeling of Primary Clarifiers

by Raymond L. Alarie, Sr. Partner; Paramount Engineering Limited, Kitchener, Ontario, Canada,
Grahame J. Farquhar, Prof.; Dept. of Civ. Engrg., Univ. of Waterloo, Waterloo, Ontario, Canada,
Edward A. McBean, Assoc. Prof.; Dept. of Civ. Engrg., Univ. of Waterloo, Waterloo, Ontario, Canada,

Serial Information: Journal of the Environmental Engineering Division, 1980, Vol. 106, Issue 2, Pg. 293-309

Document Type: Journal Paper

Discussion: Schroeder Edward D. (See full record)
Discussion: Tebbutt T. H. Y. (See full record)
Discussion: Shiba Sadataka (See full record)
Closure: (See full record)


A circular primary clarifier model is developed that utilizes flow rate, influent suspended solids, and raw sewage settling property data to produce a temporal-spatial matrix of suspended solids concentrations within the clarifier. The model allows the simulation of clarifier performance under dynamic loading conditions. Three sampling programs were conducted at the Waterloo Water Pollution Control Plant for model verification purposes. The mathematical model proved to have good predictive capabilities and to be insensitive to changes in empirically-determined coefficients. Inter-parameter correlations between BOD/TOC/SS are demonstrated that allow augmentation of effluent sampling programs.

Subject Headings: Clarifiers | Simulation models | Dynamic loads | Mathematical models | Water pollution | Data processing | Turbidity | Solids flow | Flow rates

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