A waste-activated sludge with a total solids concentration of 12,500 mg/l and volatile solids content of 8800 mg/l is applied to an aerobic digester with a detention time of 25 days. The volatile solids destruction is 50% during digestion. Calculate the volatile solids loading in units of kg/m3 . d and the solids content of the digested sludge, assuming no supernatant is withdrawn. If the solids content al the bottom of the digester can be increased lo 1.5% by quiescent settling, what percentage of the waste sludge can be decanted as supernatant?
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