Design and Operation Model of Activated Sludge

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 Θ_c 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 Θ_c for different influent waste concentrations and hydraulic residence times Θ. Sludge settling data are also shown as a function of Θ_c. Based on graphical relationships of the preceding parameters, a sample design and operation example is formulated to illustrate practical use of the kinetic model.