A completely mixed activated-sludge process is being designed for a wastewater flow of mgd using the kinetics equations. The influent BOD of 180 mg/l is essentially all soluble and the design effluent soluble BOD is 10 mg/l. For sizing the aeration volume, the mean cell residence time is selected to be 8.0 days and the MLVSS 2500 mg/l. The kinetic constants from a bench-scale treatability study are as follows: Y= 0.60 lb VSS/lb BOD, kd = 0.06 day-1, Ks = 60 mg/l, and k = 5.0 day-1.
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