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KMID : 1024520060150090897
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Journal of the Environmental Sciences
2006 Volume.15 No. 9 p.897 ~ p.905
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Co-digestion of Thermophilic Acid-fermented Food Wastes and Sewage Sludge
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Ahn Chul-Woo
Jang Seong-Ho
Park Jin-Sik
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Abstract
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This study has been conducted to investigate biodegradation characteristics and optimum mixing ratio for co-digestion with thermophilic acid-fermented food waste and sewage sludge using batch anaerobic digester. As the basis operating conditions for anaerobic digestion, the reaction temperature was controlled and stirrer was set 70rpm. Thermophilic acid-fermented food waste and sewage sludge were mixed at the ratio of 10:0, 7:3, 5:5, 3:7, 0:10 and 5;5(food waste : sewage sludge) as the influent substrates. In results of co-digestion according to mixing ratio of thermophilic fermented food wastes and sewage sludge in batch mesophilic anaerobic digestion reactor, of methane production rate at 1:1 mixing ratio was more than that of any other mixing ratios. Compared with of methane production rate at 1:1 mixing ratio of food wastes and sewage sludge, pretreatment of food wastes by thermophilic acid fermentation was more effective in co-digestion with sewage sludge.
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KEYWORD
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Co-digestion, Thermophilic acid-fermented food waste, Sewage sludge, Mixing ratios, Anaerobic digestion
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