A single-stage anaerobic digester has a capacity of 13,800 ft3, of which 10,600 ft3 is below the landing brackets. The average raw-waste sludge solids fed to the digesters are 580 lb of solids/day.
(a) Calculate the digester loading in lb of volatile solids fed/ft3 of capacity below the landing brackets/day. Assume that 70% of the solids are volatile, ,
(b) Determine the digester capacity required based on Eq. (13.11), using the following data:
average daily raw-sludge solids = 580 lb
raw-sludge moisture con ten t = 96%
digestion period = 30 days
solids reduction during digestion - 45%
digested-sludge moisture content = 94%
digested-sludge storage required = 90 days
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