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
作者： Wang, Siqi 1 ; Li, Danni 1 ; Zhang, Keqiang 1 ; Ma, Yingjun 1 ; Liu, Fuyuan 4 ; Li, Zhuowu 1 ; Gao, Xingliang 4 ; Gao, Wenxuan 1 ; Du, Lianzhu 1 ;
作者机构： 1.Minist Agr & Rural Affairs, Agroenvironm Protect Inst, Tianjin 300191, Peoples R China
2.Minist Agr & Rural Affairs PR, Key Lab Low Carbon Green Agr North China, Beijing 100193, Peoples R China
3.East China Univ Sci & Technol, Shanghai 200237, Peoples R China
4.Xinjiang Acad Agr & Reclamat Sci, State Key Lab Sheep Genet Improvement & Hlth Prod, 221 Wuyi Rd, Shihezi 2553960, Peoples R China
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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