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(3.78510m3/d). The rapid mixing treatment plant (WTP) is 1 MGD average alum dosage will be 30mg. The a mechanical mixer and the detention time of the tank will be 1 minute. Determinetical mean hydraulic I. The quantity of alum needed on a daily basisine the following: II. The dimensions of the tank in meters bor asis in kg/d, and depth, III. The power input required for a G of 900sec1 for a water temperature of 10C (express the answer in kW ). B. Disinfection is to be added to a wastewater treatment plant with an average daily flow of 13MGD, and an hourly peak factor of 2.5 . The average coliform bacteria count No=10000 organism/100 mL must be reduced to 200 organism/100 mL. Codes require a 15 -minute contact time for peak hourly flow and 30 -minute contact time for average daily flow, and a maximum chlorine dose rate of 15mg/L NtNo=(1+0.23Ctt)3 Equation (1) describes the chlorination process where: Nt= number of coliform bacteria at any time t. N0= number of coliform bacteria at any time t0. Ct= total chlorine residual at time t in mg/L. t= residence time in minutes . I. Determine the total chlorine residual (mg/L ) after 15 minutes contact time under peak conditions. II. Determine the chlorine dosage rate in lb/day