6. Design an aerated grit chamber for a plant with an average flow rate of 4.0 MGD and peak hourly flow rate of 10.0MGD. Determine the amount of air required and the discharge pressure of the blowers. Assume that the loss in the diffusers is 10 inches and the loss in piping and valves is 30% of the static water head. Determine the power required using an appropriate blower formula. Use a blower efficiency of 60%. Determine the monthly power bill, assuming a motor efficiency of 90% and a power cost of $0.08/kWh. (15 marks) Following data are given for an aerated grit chamber Detention time at Qpeak=3min Water Depth =12ft Diffuser submergence =10ft Number of chambers =2 (each channel can service 75% of the peak flow with one channel out of service) Air supply rate =3.5ft3/min.ft of length Length to width ratio =4:1