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ISSN : 2093-2332(Print)
ISSN : 2287-5638(Online)
Journal of Korea Society of Waste Management Vol.35 No.8 pp.731-743

Thermophilic Co-Digestion of Municipal Sewage Sludge and Food Waste

So-Young Han, Ho-Kang*,†, Yeon-Seok Choi, Chi-Yeol Kim*
Korea Institute of Machinery & Materials, *Chungnam National University
Corresponding author : Ho Kang, Prof. Chungnam National University,, 042-868-7363


This study was performed to test the feasibility of thermophilic (55oC) co-digestion of municipal sewage sludge and food wastes. The management variables of co-digestion were the mixed ratios of municipal sewage sludge and food waste hydraulic retention times (HRTs). During the operation of thermophilic co-digestion, the reactor pH ranged from 7.0 to 7.5 and the reactor alkalinity remained above 3,200 to 4,000 mg/L as CaCO3. The volatile fatty acids concentration increased as the HRT shortened from 20 days to 10 days and the mixture ratio increased to 1:4, but did not reach toxic levels for co-digestion of sewage sludge and food wastes. Methane productivity increased gradually as the organic loading rate increased. Maximum methane productivity reached 1.03v/v-d at an HRT of 10 days and at the mixture ratio of 1:4. The TVS removal efficiency decreased from 70.6% to 58.3% as the HRT shortened from 20 days to 10 days. TVS removal efficiency ranged from 57.0% to 77% during the entire operation. It is likely that thermophilic co-digestion of sewage sludge and food wastes is a very effective method both to environmentally treat food waste and to economically produce gas for energy.

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한소영, 강 호* ,†, 최연석, 김치열*
한국기계연구원, *충남대학교