Determine the belt width (m) of a belt filter press (BFP) if the BFP produces a sludge cake of 22% solids.

An activated sludge WWTP produces an average of 100,000 gallons per day of primary sludge at 5% solids and 250,000 gallons per day of WAS at 1.1% solids. If the WAS is thickened to 6.0% solids by dissolved air flotation and then combined with the primary sludge prior to dewatering, what is the quantity (lb/d) and solids concentration of the blended sludge (% solids)? Determine the belt width (m) of a belt filter press (BFP) if the BFP produces a sludge cake of 22% solids. Assume that the BFP operates 5 days a week for 8 hours each day. The solids in the filtrate is assumed to be 1,800 mg/L and the addition of polymer for conditioning contributes negligible weight. Assume a washwater rate of 25 gpm/meter of belt and hydraulic loading rate = 45 gpm/meter of belt.

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