The solution to Problem 12.53 is a How diagram for a treatment plant with primary sedimentation and secondary step aeration Expand this diagram to include anaerobic digestion of the waste sludge and dewatering of the digested sludge by belt-filter presses. Show the arrangement for handling both the primary sludge and waste-activated sludge, a two- stage digestion system, belt filter presses, sludge piping, and piping for return of digester supernatant and press wastewater. List numerical design guidelines for sizing the digesters, waste sludge thickeners, and belt presses.
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