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for environment engineering An activated sludge process receives 4000 m3/d conta

ID: 1828058 • Letter: F

Question

for environment engineering

An activated sludge process receives 4000 m3/d containing 120 mg. BOD/L from the primary settling tank and 3500 m3/day containing 25 mg. BOD/L from the secondary setting tank. The concentration of "mixed-liquor volatile suspended solids" (MLVSS) in the aeration tank is 3200 mg/L. The design value of hydraulic loading for the secondary settling tank is 4.0 m3/m2-hr. The ratio of diameter to depth in both tanks is 3:1. Calculate the surface area and volume of the aeration tank. Calculate the surface area and volume of the secondary settling tank. Calculate the F/M ration for the aeration tank.

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