A water treatment plant with an average flow of Q=0.7m3/s treats its water with alum at a dose of 32mg/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 20mg/L to 5mg/L, determine the total mass of Al(OH)3 removed per day. 550kg/d 503kg/d 512kg/d 526kg/d