Homework 5. Design an equalization basin (for flow) if the flow rates to a Municipal wastewater treatment plant are given in the following table:
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For a complete mix activated sludge system, determine the aeration tank volume, the hydraulic retention time, the sludge wasted daily, the mass of sludge wasted daily, the fraction of sludge recycled, and the F/M ratio for the following conditions:
population equivalent 15000 (200 l/c/d)
effluent BOD5 = 20mg/L,
yield coefficient=0.55 and
Assume also that the MLSS in the aeration basin is 4 kg/m3, in the clarifier sludge is 18 kg/m3 and the mean cell residence time is 12 days.