Design and Operation Model of Activated Sludge

by Joseph H. Sherrard, Asst Prof.; School of Civ. Engrg., Oklahoma State Univ., Stillwater, OK,
Alonzo W. Lawrence, (M.ASCE), Assoc. Prof.; School of Civ. and Envir. Engrg., Cornell Univ., Ithaca, NY,

Serial Information: Journal of the Environmental Engineering Division, 1973, Vol. 99, Issue 6, Pg. 773-784

Document Type: Journal Paper


Use of a kinetic model is made to predict parameters used in the operation and control of the activated sludge process. Mean cell residence time Θc is the basis for comparing process parameters under different conditions of operation. Effluent organic concentration, percentage of organic removal efficiency, cell concentrations, and daily sludge production are found as functions of Θc for different influent waste concentrations and hydraulic residence times Θ. Sludge settling data are also shown as a function of Θc. Based on graphical relationships of the preceding parameters, a sample design and operation example is formulated to illustrate practical use of the kinetic model.

Subject Headings: Parameters (statistics) | Activated sludge | Kinetics | Residence time | Effluents | Influents | Recycling | Hydraulics

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