4. (1 pt) A fish processing plant generates 0.01m3/s of wastewater each day. The wastewater is treated in an activated sludge plant. The average BOD5 of the raw wastewater before primary settling is 1350mgL1. The aeration tank has effective liquid dimensions of 8m wide by 8m long by 5m deep. Using the following assumptions, determine the: (i) solids F/M ratio, (ii) aerator detention time, (iii) solids retention time, (iv) cell wastage flow rate, and (v) return sludge flow rate. Draw and label a diagram with the relevant variables shown. Soluble BOD5 after primary settling =900mg/L MLVSS =2000mg/L MLSS =1.25(MLVSS) Allowable BOD5 in effluent =25.0mg/L Allowable suspended solids in effluent =30.0mg/L Wastage is from the return sludge line Yield coefficient =0.50mgVSS/mgBOD5 removed Decay rate of microorganisms =0.075d1 BOD5 fraction of suspended solids =30.0%