Question

A belt filter press housed in a mobile trailer was used to test the dewaterability of an anaerobically digested sludge. The effective width of the belt was 1.0 m. The operating data were a sludge feed rate of 4.5 m³/hr, polymer dosage of 0.45 m³/hr containing 0.20% powdered polymer by weight, and wash-water flow of 1.07 l/s. Based on laboratory analyses, total solids in the feed sludge equaled 3.5%, total solids in the cake equaled 32%, wastewater from belt washing contained 2600 mg/l suspended solids, and the filtrate was 1.20 l/s with 500 mg/l of suspended. calculate the solids recovery in %.

Answer 1