An aerobic digester received waste from an MBR treatment plant. The 0.55 mgd plant has 180 mg/l BOD (the soluble portion is 100 mg/l) and 200 mg/l suspended solids (160 mg/l is volatile). The target effluent soluble BOD is 0 mg/l. Size 4 equally numbered aerobic digesters with a 15 ft water depth. Design criteria includes MLSS = 7000 mg/l, solids detention time = 28 days, Y = 0.8, and kd = 0.04. Calculate the aeration volume, waste sludge, and aerobic digester volume required to meet Class B requirements
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