Awastewater treatment plant uses an activated sludge process for secondary treatment of 0.300 m3 /s of primary effluent. the mixed liquor has a biomass concentration of 2,100 mg vss/l, and the ras biomass concentration is 10,000 mg vss/l. the substrate concentration in the primary effluent (i. e., s0) is 220 mg bod5/l. the f/m ratio for the activated sludge tank is 0.52 mg bod5/(mg vss * d), and the cell residence time is 9.0 d.
a. what is the volume of the activated sludge tank?
b. what is the was flow rate?