The 500- bed Lotta Hart Hospital has a small activated sludge plant to treat its wastewater. The average daily hospital discharge is 1500 L per day per bed, and the average soluble BOD5 after primary settling is 500 mg/L. The aeration tank has effective liquid dimensions of 10m wide by 10m long by 4.5m deep. The plant operating parameters areas follows: MLVSS =2500mg/L MLSS= 1.20 (MLVSS) Determine the following: aeration period, F/M ratio, SVI, solids concentration in return sludge. Using the following assumptions, determine the solids retention time, the cell wastage flow rate, and the return sludge flow rate for the Lotta Hart Hospital WWTP (Problem 1. ). Assume: Allowable BOD5 in effluent = 25 mg/L Suspended solids in effluent = 25 mg/L Wastage is from the return sludge line Yield coefficient = 0.60 mg VSS/mg BOD5 removed Decay rate of microorganisms = 0.060 d-1