A water treatment plant with an average flow of Q = 0.55 m3/s treats its water with alum at a dose of 21 mg/L. Alum coagulation is used to remove particulate matter, reduce the concentration of organic matter, and reduce the alkalinity of the water according to Equation 10-1. If the organic matter concentration is reduced from 18 mg/L to 2 mg/L, determine the total mass of AllOH)3 removed per day. 224 kg/d 274 kg/d 214 kg/d 259 kg/d