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The effects of the addition of soluble starch and peptone on cellulose degradation in anaerobic digestion were investigated using an anaerobic chemostat-type reactor at 35°C and with SRT of 2.2 and 4.8 days. The synthetic substrate containing 5000mg/l of cellulose powder was supplemented with the various concentrations of soluble starch and peptone. The addition of small amounts of soluble starch promoted cellulose degradation. Especially, the addition of 3000mg/l resulted in a 25% increase at SRT of 4.8 days. The addition over 7500mg/l, however, depressed cellulose degradation because of the competition of cellulolytic and non-cellulolytic bacteria for essential mineral salts except ammonium bicarbonate. The addition of peptone was more effective than that of soluble starch, and cellulose degradation percentage increased by 42.7% and 32.3% at SRT of 2.2 and 4.8 days, respectively.

EFFECTS OF THE ADDITION OF SOLUBLE STARCH AND PEPTONE ON CELLULOSE DEGRADATION IN ANAEROBIC DIGESTION