The Effects of the Qualities of Separately High-concentrated Sludges and Dosing Bio-active Reagent (Saponin) on the Anaerobic Digestion of Sewage Sldge.
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概要
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The anaerobic digestion of sewage sludge was earned out. The sludge used was the mixed sludge of centrifugally thickened excess sludge (TS about 4%) and gravitationally thickened sludge (TS about 5%) from treatment plant of separate sewerage system, and the bio-active regent (saponin 5ppm) was dosed in the anaerobic digestion tank. The temperature of tank was 35°C in the mesophlic digestion. The retention time of sludge was 20, or 7 days. The volume of produced gas was about 20 times compared with that of feed sludge. The produced gas volume per feed organic substace was 0.4-0.55 [l/g-VTS] . The concentration of H<SUB>2</SUB>S and CH<SUB>3</SUB>SH in the gas was remarkably decreased by dosing saponin.
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