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Published byMarissa Coy Modified over 2 years ago

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Home Work 1.Each day 3780 m 3 of wastewater is treated at a municipal wastewater treatment plant. The influent contains 220 mg/L of suspended solids. The clarified water has a suspended solids concentration of 5mg/L. Determine the mass of sludge produced daily from the clarifier and write down the mass balance of the clarifier.

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2. A wastewater treatment plant with an output of 38400m 3 /day discharges the liquid effluent with a BOD of 20mg/L into a river. If the BOD of the river upstream of the discharge point is 0.2mg/l, at a minimum flow of 20m 3 /s, compare the BOD of the river downstream of the discharge, assuming complete mixing. Answer = 0.63mg/L Home Work

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3. A slurry containing 20 percent by weight of limestone (CaCO 3 ) is processes to separate pure dry limestone from water. If feed rate is 2000kg/h, how much CaCO 3 is produced per hour? H OME W ORK

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