After expansion of an activated-sludge plant, the production of waste-activated sludge during the maximum month is 500 m 3/d with 0.80% solids. The old existing flotation thickeners are to be replaced by gravity belt thickeners. Determine the size of two identical units to increase the solids content to a minimum of 5%. Assume that operation is to be 7 d/wk for a maximum of 7 hr/d; design hydraulic loading of 34 m3/m • h and maximum solids loading of 270 kg/m • h. if the polymer solution is 0.20% dry powder by weight, what is the solution feed rate for a polymer dosage of 3.0 kg/tonne?
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