1 Raw sludge at a rate of 180 gpm is pumped for similar to three anaerobic digesters (40-ft…

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May 15, 2022

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1 Raw sludge at a rate of 180 gpm is
pumped for similar to three anaerobic digesters (40-ft diameter, 20-ft

depth) containing 5 percent solids that
are 65 percent volatile. Sludge does not settle and is not withdrawn. The
digesters maintain 42 percent volatile solids destruction. Calculate the liquid
detention time, loading rate, and final solids percentage.

2 An aerobic digester received waste from
an MBR treatment plant. The 0.55 mgd plant has 180 mg/l BOD (the soluble portion
is 100 mg/l) and 200 mg/l suspended solids (160 mg/l is volatile). The target effluent
soluble BOD is 0 mg/l.

1 Raw sludge at a rate of 180 gpm is
pumped for similar to three anaerobic digesters (40-ft diameter, 20-ft

depth) containing 5 percent solids that
are 65 percent volatile. Sludge does not settle and is not withdrawn. The
digesters maintain 42 percent volatile solids destruction. Calculate the liquid
detention time, loading rate, and final solids percentage.

2 An aerobic digester received waste from
an MBR treatment plant. The 0.55 mgd plant has 180 mg/l BOD (the soluble portion
is 100 mg/l) and 200 mg/l suspended solids (160 mg/l is volatile). The target effluent
soluble BOD is 0 mg/l. Size 4 equally numbered aerobic digesters with a 15 ft
water depth. Design criteria includes , solids detention time days, , and . Calculate
the aeration volume, waste sludge, and aerobic digester volume required to meet
Class B requirements.

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