Advancing anaerobic digestion with MnO2-modified biochar: Insights into performance and mechanisms

文献类型： 外文期刊

第一作者： Li, Yeqing

作者： Li, Yeqing;Zhang, Jinglei;Wen, Xinran;Chen, Shuo;Liu, Qiang;Zhao, Shenggeng;Zhou, Hongjun;Mazarji, Mahmoud;Pan, Junting;Feng, Lu;Li, Yeqing;Zhou, Hongjun;Li, Gang

作者机构：

关键词： Biochar; Electron transport; Microbial community; High organic load; High ammonia nitrogen

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：8.0； 五年影响因子：8.7 ）

ISSN： 0048-9697

年卷期： 2024 年 954 卷

页码：

收录情况： SCI

摘要： The use of bio-based composites to enhance the methane production in anaerobic digestion has attracted considerable attention. Nevertheless, the study of electron transfer mechanisms and the applications of biochar/MnO2 (MBC) in complex systems remains largely unexplored. Biochar composited with MnO2 at 10:1 mass ratio (MBC10) increased the content of volatile fatty acids by 9.09 % during acidogenic phase. During the methanogenic experiments using acetate, cumulative methane production (CMP) rose by 5.83 %, and in the methanogenic experiments using food waste, CMP increased by 24.32 %. Microbial community analysis indicated an enrichment of Syntrophomonas, Bacilli, and Methanosaetaceae in the MBC10 group. This enrichment occurred mainly due to the redox capability of MnO2 enhancing MBC capacitance, thereby facilitating microbial electron transfer processes. Additionally, under 2 g/L ammonia nitrogen concentration and 30 g/L organic load, the CMP of MBC10 increased by 12.74 % and 9.44 %, respectively, compared to the BC600 group. This study illuminates MBC's electron transfer mechanisms and applications, facilitating its wider practical adoption and fostering future innovations.

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