A centrifuge dewaters sludge at a feed of 250 gpm containing 2.6 percent solids. Active polymer addition is 22 lb/ton of sludge (polymer is 45 percent active). The cake solids are 26 percent and the cen-trate contains 1720 mg/l solids. Calculate the pounds of solids applied, the removal efficiency, the pounds of active polymer, and total pounds of polymer used. If polymer weighs about 9 lb/gal, what is the polymer feed rate in gallons per hour?
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