A wastewater treatment plant treats municipal wastewater. The influent flow rate Q is 10 000 m3/d, BOD7,ATU is 200 mg/l and SS 300 mg/l. Effluent concentration requirements are BOD7,ATU 5 mg/l and SS 10 mg/l. a) Calculate the volume of the aeration basin if the volumetric loading is 1,0 kg BOD/m3 d. b) Calculate the sludge loading rate (F/M) using MLSS concentration of 3 g/l. c) Waste activated sludge is removed from the return activated sludge with a flow rate of 150 m3/d. Calculate the sludge age of the process assuming that RAS concentration is twice the MLSS.