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An activated-sludge system is to be used for secondary treatment of 10,000m3/d of municipal waste water. After primary clarification, the BOD5 is 180mg/L, and it is desired to have not more than 5mg/L of soluble BOD5 in the effluent. A completely mixed reactor is to be used, and pilot-plant analysis has established the following kinetic values: Y=0.5kg/kg,kd=0.05d1. Assuming an MLSS concentration of 3000 mg/L, a sludge age of 10 days, and an Underflow concentration of 10,000mg/L from the secondary clarifier