A conventional activated-sludge plant treats a domestic wastewater with 220 mg/l of suspended solids, 180 mg/l of BOD, and 6.4 mg/l of total phosphorus. After primary settling, the characteristics are 110 mg/l of suspended solids, 120 mg/l of BOD, and 5.4 mg/l of total phosphorus. Based on a pilot-plant study, a dosage of 116 mg/l of alum is required to reduce the effluent total phosphorus to 0.5 mg/l with the aeration tank operating at an F/M of 0.20 g BOD/day/g MLSS. The effluent suspended-solids concentration averages 10 mg/l. Calculate the estimated production of sludge solids per cubic meter of wastewater treated. If the primary sludge has a solids content of 5.0% and the waste sludge from the chemical-biological aeration system has a concentration of 1.5%, calculate the liters of combined sludge produced per cubic meter of wastewater treated.
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