Straw Biochar-Facilitated Methanogenesis from Acetic Acid and Ethanol: Correlation with Electron Exchange Capacity
文献类型： 外文期刊
作者： Ruan, Yannan 1 ; Jiang, Yuze 1 ; Li, Moting 2 ; Xu, Suyun 1 ; Zhang, Jining 3 ; Zhu, Xuefeng 1 ; Liu, Hongbo 1 ;
作者机构： 1.Univ Shanghai Sci & Technol, Sch Environm & Architecture, Shanghai 200093, Peoples R China
2.Shanghai Inst Mech & Elect Engn Co Ltd, Shanghai 200040, Peoples R China
3.Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, Shanghai 201106, Peoples R China
关键词： anaerobic digestion; biochar; electron exchange capacities; ethanol; hydrochar
期刊名称：FERMENTATION-BASEL （ 影响因子：3.7； 五年影响因子：4.5 ）
ISSN：
年卷期： 2023 年 9 卷 7 期
页码：
收录情况： SCI
摘要： Straw biochar prepared by three methods (i.e., pyrochar, HNO3-modified pyrochar, and hydrochar) was added to the anaerobic digestion system with acetic acid and ethanol as substrates to explore the effects of biochar on methane production, substrate degradation, and microbial community structure. The biogas yields of the biochar-supplemented groups all increased, and the maximum methane yield was found in the hydrochar group, which was 45.4% higher than the control. In the ethanol-fed reactor, the maximum partial pressure of hydrogen in the headspace of the hydrochar reactor was reduced from 3.5% (blank reactor) to 1.9%. Overall, methane production is directly proportional to the electron exchange capacity (EEC) value of biochar. Furthermore, the bio-aging process increased the EEC of each kind of biochar to 5.5-8.1%, which was favorable for the sustainable promotion of methanogenesis. The increased methane yield from the bio-aged biochar could either be attributable to the changes in surface oxygen-containing functional groups or the selectively enriched microbial community on the biochar, such as Geobacter, which could participate in direct interspecies electron transfer.
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