Solve this two questions!

4. Circular primary sedimentation tanks are to be designed to treat municipal wastewater treatment average flow of 32000m3/d. The minimum side wall depth is 3 m. The overflow rate (HL) is assume as 36.7m3/m2d and the maximum allowable WL = is 186m3/m.d at the average design flow. Determine: a. The number and diameter of tanks needed (assume the maximum allowable diameter is 40m ). b. The side depth and the center depth of each tank. (cheek the hydraulic detention time) c. Check the weir loading rate and make any modification if it exceeds the maximum allowable weir loading. 5. Rectangular primary sedimentation tanks are to be designed to treat municipal wastewater treatment average flow of 70000m3/d. The minimum side wall depth is 3 m. The overflow rate (HL) is assume as 36.7m3/m2 d and the maximum allowable WL = is 186m3/m.d at the average design flow. Determine: d. The number and dimensions of tanks needed cassume the maximum allowable width of the tank is 15m ). e. Check the weir loading rate and make any modification if it exceeds the maximum allowable weir loading