Alleviating "inhibited steady-state" in anaerobic digestion of poultry manure by bentonite amendment: Performance evaluation and microbial mechanism

文献类型： 外文期刊

第一作者： Ma, Junyi

作者： Ma, Junyi;Zhang, Yulei;Yao, Zonglu;Yu, Jiadong;Luo, Juan;Shen, Ruixia;Zhao, Lixin;Pan, Junting;Awasthi, Mukesh Kumar

作者机构：

关键词： Semi-continuous anaerobic digestion; Inhibited steady-state; Bentonite; Exogenetic electron mediator; Methane production

期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：11.889； 五年影响因子：11.139 ）

ISSN： 0960-8524

年卷期： 2022 年 360 卷

页码：

收录情况： SCI

摘要： This study systematically evaluated the effects of bentonite as a possible additive to alleviate the "inhibited steady-state" induced by ammonia and acid accumulation during anaerobic digestion. Continuous stirred tank reactors fed with poultry manure were operated at 35 +/- 1 degrees C either with bentonite or not. The results demonstrate that bentonite amendment increased average specific methane production by 35% as suffered from steady-state at an organic loading rate of 6.25 g VS/L.d. 16S rRNA gene amplicon sequencing revealed that the relative abundance of electron-donating Sedimentibacter and Syntrophomonas, and electrophilic Methanosarcina was increased by 110%, 91%, and 49%, respectively. The genera were identified as crucial for alleviating "inhibited steady-state", through establishment of a more robust syntrophic pathway of methanogenic acetate degradation. The enhancement might result from the accelerated electron transfer by bentonite, which is qualified for serving as an exogenetic electron mediator due to containing abundant redox-active metal elements.

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