A belt filter press test unit, housed in a mobile trailer, was used to test the dewaterability of anaerobically digested sludge. The 0.5-m unit operated at a feed rate 20 gpm and a polymer dosage of 2 gpm containing 0.2 percent polymer by weight. Wash-waler flow was 17 gpm and contained 2000 mg/l suspended solids, and the filtrate was 19 gpm with 500 mg/l. The feed solids of 3.5 percent are thickened to a cake of 32 percent. Calculate the hydraulic loading, solids loading, polymer dosage, and solids recovery.
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