Question

Design a completely mixed activated sludge process using three different design approaches (i.e. calculate the volume of the aeration basin). Base your design for the first approach on detention time, for the second one on BOD loading, and the third one on kinetics. The influent design flow rate to the activated sludge process is 10,000 m3 /day with a BOD5 concentration of 200mg/L. Completely mixed activated sludge processes typically have a detention time ranging from 3 to 6 hours and BOD5 loadings ranging from 50 to 120 lb BOD5(d·1000 ft3 ). Typical biokinetic coefficients used in design are Y = 0.6mg VSS/mg BOD5, k= 3 d -1, Ks = 60 mg/L, and kd = 0.06 d-1. Use a MCRT = 10 days and X = 2500 mg/L VSS.

Answer 1