Ethanol-type anaerobic digestion enhanced methanogenic performance by stimulating direct interspecies electron transfer and interspecies hydrogen transfer

文献类型： 外文期刊

第一作者： Zhang, Shuang

作者： Zhang, Shuang;Ren, Yuanyuan;Zhao, Pan;Wang, Xiaona;Wang, Qunhui;Ren, Yuanyuan;Wang, Xiaona;Wang, Qunhui;Sun, Xiaohong

作者机构：

关键词： Methane production; E-pili; Ethanol-type fermentation; Syntrophic metabolism; Hydrogenase genes

期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：9.7； 五年影响因子：9.4 ）

ISSN： 0960-8524

年卷期： 2024 年 410 卷

页码：

收录情况： SCI

摘要： Ethanol pre-fermentation of food waste effectively alleviates acidification; however, its effects on interspecies electron transfer remain unknown. This study configured the feed according to COD ratios of ethanol: sodium acetate: sodium propionate: sodium butyrate of 5:2:1.5:1.5 (ethanol-type anaerobic digestion) and 0:5:2.5:2.5 (control), and conducted semi-continuous anaerobic digestion (AD) experiments. The results showed that ethanol-type AD increased maximum tolerable organic loading rate (OLR) to 6.0 gCOD/L/d, and increased the methane production by 1.2-14.8 times compared to the control at OLRs of 1.0-5.0 gCOD/L/d. The abundance of the pilA gene, which was associated with direct interspecies electron transfer (DIET), increased by 5.6 times during ethanol-type AD. Hydrogenase genes related to interspecies hydrogen transfer (IHT), including hydA-B, hoxH-Y, hnd, ech, and ehb, were upregulated during ethanol-type AD. Ethanol-type AD improved methanogenic performance and enhanced microbial metabolism by stimulating DIET and IHT.

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