A diaphragm plate-and-frame filter press is used to dewater alum sludge from a water treatment plant. Each chamber of the press has a filtering area of 36 ft2. During normal operation, the total cycle time (feed, compression, discharge, and wash) is 20 min.The volume of alum sludge applied per chamber per cycle is 300 gal, and the lime dosage as CaO is 10% of the alum solids. The alum sludge feed averages 3.6% solids, and the sludge cake is 38.5% solids, including the lime. Solids capture can be assumed to be 100%, since the filtrate contains less than 200 mg/l of suspended solids. Calculate the cake production per gallon of alum sludge in pounds, assuming a specific gravity of 1.0, and the filter yield in pounds per square foot per hour based on applied alum solids. .
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