A town is going to upgrade its primary WWTP to a secondary plant that can meet the effluent standard of 25 mg/L BOD5 and 30 mg/L suspended solids. They have selected a CSTR activated sludge system for the upgrade. The existing primary treatment plant has a flow rate of 0.035 m3/s. The effluent from the primary tank has a BOD5 of 340 mg/L. Assume that BOD5 of the effluent suspended solids is 70 percent of the allowable suspended solids concentration. Growth constant values are estimated to be Ks = 115 mg/L BOD5, kd 0.029 d-1, ?max = 9.5 d-1, Y = 0.8 mg VSS/mg BOD5 removed. The design MLVSS is 3,500 mg/L. Estimate the required volume of the aeration tank