A surface water is coagulated with a dosage of 30 mg/l ferrous sulfate and. an equivalent dosage of lime. (a) How many pounds of ferrous sulfate are needed per million gallons of water treated? (b) How many pounds of hydrated lime are required assuming a purity of 70 percent CaO? (c) How many pounds of Fe(OH)3, sludge are produced per million gallons of water treated?
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