The aeration tank for a completely mixed aeration process is being sized for a design wastewater flow of 7500 m3/d. The influent BOD is 130 mg/l with a soluble BOD of 90 mg/l. The design effluent BOD is 20 mg/l with a soluble BOD of 7.0 mg/l. Recommended design parameters are a sludge age of 10 d and volatile MLSS of 1400 mg/l. Selection of these values takes into account the anticipated variations in wastewater flows and strengths. The kinetic constants from a bench-scale treatability study are Y = 0.60 mg VSS/mg soluble BOD and kd = 0.06 per day. Calculate the volume of the aeration tank, aeration period, food/micro organism ratio, and excess biomass in the waste-activated sludge.
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