Problem

The raw sludge pumped to an anaerobic digester contains 5.0% solids that are 65% volatile....

The raw sludge pumped to an anaerobic digester contains 5.0% solids that are 65% volatile. The digested sludge withdrawn from the tank has 6.5% solids that are 40% volatile. Based on these data, estimate by calculations

(a) the percentage of volatile solids converted to gas during digestion and


(b) the quantity of supernatant withdrawn for every 1000 gal of raw sludge fed to the digester.

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