The city of Pherric’s coagulation treatment plant sedimentation tank is being designed to treat a flow of 20,000 m3/d. Based on jar tests, the design dose of ferric chloride is estimated to be 18.0 mg/L and the polymer dose is estimated to be 0.1 mg/L. The design raw water suspended solids concentration is 19.4 mg/L. The design effluent suspended solids concentration from the settling tank is 3.0 mg/L. The following sludge characteristics have been selected for the design: sludge solids content = 0.010%, specific gravity of the sludge solids = 1.2. What volume of sludge from the settling tank must be disposed of each day? Assume that the ferric chloride is fed as FeCl3 .
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