Effects of initial volatile fatty acid concentrations on process characteristics, microbial communities, and metabolic pathways on solid-state anaerobic digestion

文献类型： 外文期刊

第一作者： Wang, Siqi

作者： Wang, Siqi;Li, Danni;Zhang, Keqiang;Ma, Yingjun;Li, Zhuowu;Gao, Wenxuan;Du, Lianzhu;Wang, Siqi;Zhang, Keqiang;Gao, Wenxuan;Du, Lianzhu;Li, Danni;Liu, Fuyuan;Gao, Xingliang

作者机构：

关键词： Acetate; Propionate; Methane production; Microbial dynamics; Enzyme activities

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 369 卷

页码：

收录情况： SCI

摘要： Solid-state anaerobic digestion (SSAD) is vulnerable to excess volatile fatty acids (VFA), mainly acetate and propionate. The co-effects of VFAs and microbial dynamics under VFA accumulation were investigated in SSAD of pig manure and corn straw. Adding 2 and 4 mg/g acetate or propionate caused initial increases in total VFAs, followed by decreases after day 6, resulting in 'mild' VFA accumulation, while adding 6 mg/g caused similarly increased VFAs, but with no subsequent decrease, causing 'severe' VFA accumulation and poor methanation performance. Mild propionate accumulation promoted acetate consumption, whereas acetate accumulation inhibited propionate degradation by affecting crucial redox reactions. Under severe VFA accumulation, hydrolysis and acidification mainly conducted by acid-tolerant Clostridium sp. exacerbated VFA inhibition, causing a competition between Methanosarcina and Methanosaeta, and impairments of acetoclastic and hydrogenotrophic methanogenesis and interspecies formate transfer. This study provides new insights into mechanisms of VFA accumulation in SSAD, and its effects on methanogenesis.

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