A conventional active-sludge system treats 11,000 m3/day of wastewater with a BOD of 180 mg/I in an aeration tank with a volume of 3400 m3. The operating conditions are an effluent suspended solids of 20 mg/1, an MLSS concentration of 2500 mg/1 and an activated sludge wasting rate of 160 m3/day containing 8000 mg/1.
a. Calculate the aeration period (7.4 hr)
b. Calculate the BOD loading (36.3 Ib BOD/ 1000 cf-day)
c. Calculate the F/M loading (0.23)
d. Calculate the sludge age (5.7 days)
e. Calculate Qr (4767 m^3/day)