Effects of lactic acid fermentation on the biomethanation of food waste in two-stage anaerobic digestion
文献类型： 外文期刊
作者： Hou, Wenxue 1 ; Wang, Xindong 1 ; Tian, Tian 4 ; Wang, Juan 3 ; Xiao, Benyi 1 ; Li, Lin 1 ;
作者机构： 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Inner Mongolia Univ Technol, Sch Civil Engn, Hohhot 010051, Peoples R China
4.Chinese Acad Agr Sci, Inst Grassland Res, Hohhot 010010, Peoples R China
关键词： Acidogenic reactor; Biomethanation; Food waste; Lactic acid fermentation; Two-stage anaerobic digestion
期刊名称：FUEL （ 影响因子：7.5； 五年影响因子：7.1 ）
ISSN： 0016-2361
年卷期： 2025 年 400 卷
页码：
收录情况： SCI
摘要： Semi-continuous experiments were carried out to investigate the effects of lactic acid (LA) fermentation on the biomethanation of food waste (FW) in two-stage anaerobic digestion (TSAD). The results showed that the LA fermentation in the acidogenic reactor (AR) improved the performance of FW's TSAD by increasing biomethane production and organic matter removal by 17.02 +/- 4.64 % and 4.84 +/- 1.50 % respectively and by upgrading the biogas quality. LA fermentation increased the substrate utilization rate, reduced the loss of chemical oxygen demand, and decreased the invalid conversion of organic matter in TSAD. LA fermentation also increased the relative abundance of Methanosarcina from 13.57 % to 55.68 % and decreased that of Methanosaeta from 30.22 % to 19.87 % in the methanogenic reactor (MR), which reduced the partial hydrogen pressure and promoted the conversion of LA to acetic acid rather than propionic acid. Furthermore, LA fermentation increased the abundance of functional enzymes related to the major methanogenesis pathways in the MR.
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