The city of Calcareous’ upflow solids contact tank design flow is 30,000 m3/d. The water source is the Raccoon River. The plant will remove 114 mg/L of calcium carbonate hardness as CaCO3 by the addition of lime. No other hardness removal is required. The maximum turbidity of the Raccoon River at flood stage is 71 mg/L. Ferric chloride is to be added at a dose of 25 mg/L as FeCl3 in the coagulation step following softening. Based on experience with similar plants, an effluent suspended solids concentration of 2.0 mg/L is being used for the design. The design sludge solids content is 10% and the design specific gravity of the sludge solids is 1.9. What volume of sludge from the upflow solids contact unit must be disposed of each day during flood stage?
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