Aerobic digesters with a total capacity of 50,000 ft3 stabilize waste-activated sludge from an extended-aeration treatment plant without primary clarification. The average daily sludge flow pumped to the digestion tanks is 32,000 gal with 1.5% solids, of which 65% are volatile. The estimated solids production per capita is 0.17 lb ofVS/person/day. Calculate the sludge detention time in the digesters, VS loading lb/ft3/day and volume provided per capita.
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