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Sooner City Reclamation Plant is a completely mixed activated sludge process designed to treat 20,000 m3/d...

Sooner City Reclamation Plant is a completely mixed activated sludge process designed to treat 20,000 m3/d of domestic wastewater having an influent BOD5 concentration of 350 mg/L (assume a 28.6% reduction in during primary treatment). Use typical activated sludge kinetic constants except for kd = 0.06 1/d. Assume that the MLVSS concentration in the aeration basin is maintained at 3,000 mg/L and the ratio of VSS:TSS is 0.75. Permit requires that the effluent BOD5 and TSS concentrations do not exceed 20 mg/L on an annual basis.

Part 1: What is the effluent soluble BOD5 concentration, in mg/L, necessary to meet the total BOD5 treatment criteria?

Part 2: What is the mean cell residence time, in days, necessary to meet the treatment criteria?

Part 3: What is the volume of the aeration basin in cubic meters?

Part 4: What is the quantity of daily sludge wasted, in kg/d, at the mean cell residence time determined in Part 2?

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