Inhibition of volatile fatty acids on methane production kinetics during dry co-digestion of food waste and pig manure 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Waste Management
年/卷/期
2018 / 79 /
页码
302-311
ISSN号
0956-053X
作者单位
TEAGASC, Anim & Grassland Res & Innovat Ctr, Anim & Biosci Res Dept, Grange, Meath, Ireland;Natl Univ Ireland, Coll Engn & Informat, Civil Engn Coll, Galway, Ireland;Waterford Inst Technol, Dept Sci, Waterford, Ireland;Natl Univ Ireland, Coll Engn & Informat, Civil Engn Coll, Galway, Ireland;Natl Univ Ireland, Coll Engn & Informat, Civil Engn Coll, Galway, Ireland;TEAGASC, Pig Dev Dept, Anim & Grassland Res & Innovat Ctr, Moorepk, Fermoy, Cork, Ireland;Hefei Univ Technol, Sch Civil Engn, Hefei 230009, Anhui, Peoples R China;TEAGASC, Anim & Grassland Res & Innovat Ctr, Anim & Biosci Res Dept, Grange, Meath, Ireland;
作者
Cormican, Paul;Zhan, Xinmin;Gardiner, Gillian E.;Jiang, Yan;Dennehy, Conor;Lawlor, Peadar G.;Hu, Zhenhu;McCabe, Matthew;
摘要
Compared with wet digestion, dry digestion of organic wastes reduces reactor volume and requires less energy for heating, but it is easily inhibited by high volatile fatty acid (VFA) or ammonia concentration. The inhibition on methane production kinetics during dry co-digestion of food waste and pig manure is rarely reported. The aim of this study was to explore the inhibition mechanisms and the microbial interactions in food waste and pig manure dry co-digestion systems at different inoculum rates (25% and 50% based on volatile solids) and food waste/pig manure ratios (0:100, 25:75, 50:50, 75:25 and 100:0 based on volatile solids). The results showed that the preferable operation conditions were obtained at the inoculum rate of 50% and food waste/pig manure ratio of 50:50, with a specific methane yield of 263 mL/g VSadded. High WA concentration was the main inhibition factor on methane production, and the threshold VFA inhibition concentrations ranged 16.5-18.0 g/L. Syntrophic oxidation with hydrogenotrophic methanogenesis might be the main methane production pathway in dry co-digestion systems due to the dominance of hydrogenotrophic methanogens in the archaeal community. In conclusion, dry co-digestion of food waste and pig manure is feasible for methane production without pH adjustment and can be operated stably by choosing proper operation conditions. (C) 2018 Elsevier Ltd. All rights reserved.
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关键词/主题词
Dry digestion;Co-digestion;VFA inhibition;Microbial community structure;Syntrophic oxidation;Hydrogenotrophic methanogenesis;
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