the town of camp verde has been directed to upgrade its primary wwtp to a secondary plant that can meet an effluent standard of 25.0 mg/l bod5 and 30 mg/l suspended solids. they have selected a completely mixed activated sludge system for the upgrade. the existing primary treatment plant has a flow rate of 2,506 m3/d. the effluent from the primary tank has a bod5 of 240 mg/l. using the following assumptions, estimate the required volume of the aeration tank:
