Intermittent energization improves microbial electrolysis cell-assisted thermophilic anaerobic co-digestion of food waste and spent mushroom substance
文献类型： 外文期刊
作者： Zhang, Shuang 1 ; Guan, Weijie 1 ; Sun, Haishu 1 ; Zhao, Pan 1 ; Wang, Wanqing 2 ; Gao, Ming 1 ; Sun, Xiaohong 3 ; Wang, Qunhui 1 ;
作者机构： 1.Univ Sci & Technol Beijing, Sch Energy & Environm Engn, Dept Environm Sci & Engn, Beijing 100083, Peoples R China
2.Univ Sci & Technol Beijing, Tianjin Coll, Tianjin 301811, Peoples R China
3.Beijing Acad Agr & Forestry Sci, Beijing Agrobiotechnol Res Ctr, Beijing 100097, Peoples R China
4.Univ Sci & Technol Beijing, 30 Xueyuan Rd, Beijing 100083, Peoples R China
关键词： Anaerobic fermentation; Electroactive microorganisms; Extracellular electron transfer; Genes abundances; Microbial community
期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：11.4； 五年影响因子：10.6 ）
ISSN： 0960-8524
年卷期： 2023 年 370 卷
页码：
收录情况： SCI
摘要： Microbial electrolysis cell-assisted thermophilic anaerobic digestion (MEC-TAD) is a promising method to improve anaerobic co-digestion efficiency; however, its application is restricted by high energy consumption. To improve the energy use efficiency of MEC-TAD, this study investigated the effect of different intermittent energization strategies on thermophilic co-digestion performance. Results revealed that an 18 h-ON/6h-OFF energization schedule resulted in the fastest electron transfer rate and the highest methane yield (364.3 mL/g VS). Mechanistic analysis revealed that 18 h-ON/6h-OFF resulted in the enrichment of electroactive microor-ganisms and increased abundance of enzyme-coding genes associated with energy metabolism (ntp, nuo, atp), electron transfer (pilA, nfrA2, ssuE), and the hydrogenotrophic methanogenic pathway. Finally, energy balance analysis revealed that 18 h-ON/6h-OFF had the highest net energy benefit (2.52 kJ) and energy conversion efficiency (110.76 %). Therefore, intermittent energization of MEC-TAD using an 18 h-ON/6h-OFF schedule can provide improved performance and more energy savings.
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