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KMID : 0545120170270081513
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Journal of Microbiology and Biotechnology
2017 Volume.27 No. 8 p.1513 ~ p.1518
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Biomethanation of Sewage Sludge with Food Waste Leachate Via Co-Digestion
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Shin Jing-Yeong
Kim Young-Beom
Jeon Jong-Hun
Choi Sang-Ki
Park In-Kyu
Kim Young-Mo
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Abstract
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Anaerobic mono- and co-digestion of sewage sludge and food waste leachate (FWL) were performed by assessing methane production and characterizing microbial communities. Anaerobic digestion (AD) of waste activated sludge (WAS) alone produced the lowest methane (281 ml CH4), but an approximately 80% increase in methane production was achieved via co-digestion of WAS and FWL (506 ml CH4). There were less differences in the diversity of bacterial communities in anaerobic digesters, while archaeal (ARC) and bacterial (BAC) amounts reflected AD performance. Compared with the total ARC and BAC amounts in the mono-digestion of WAS, the ARC and BAC amounts increased two and three times, respectively, during co-digestion of FWL and WAS. In characterized archaeal communities, the dominant ratio of hydrogenotrophic methanogens in the mono-digestion of WAS approached nearly a 1:1 ratio of the two acetoclastic and hydrogenotrophic methanogens in the co-digestion of FWL and WAS. The ARC/BAC ratio in the digesters varied in the range of 5.9% to 9.1%, indicating a positive correlation with the methane production of AD.
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KEYWORD
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Co-digestion, sewage sludge, food waste leachate, biogas, microbial community
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