Characteristics of instability and suitable early-warning indicators for cornstalk-fed anaerobic digestion subjected to various sudden changes

文献类型： 外文期刊

第一作者： Shen, Ruixia

作者： Shen, Ruixia;Geng, Tao;Yao, Zonglu;Yu, Jiadong;Luo, Juan;Zhao, Lixin;Wang, Hongliang;Zhao, Lixin

作者机构：

关键词： Straw; Anaerobic fermentation; Sudden change; Microbial community; System monitoring; Volatile fatty acids

期刊名称：ENERGY （ 影响因子：9.0； 五年影响因子：8.3 ）

ISSN： 0360-5442

年卷期： 2023 年 278 卷

页码：

收录情况： SCI

摘要： In the process of anaerobic digestion (AD), the poor buffer capacity of the system could lead to the imbalance of the supply and demand of methanogens for organic matters, which may subsequently result in the decrease of biogas production, and even the instability of the whole AD system. In this study, key factors of sudden change were simulated based on the frequent instability problems in biogas projects, and subsequent instability prop-erties, early-warning indicators, and microbial community characteristics were investigated. On the whole, the stable early-warning indicators were biogas production rate and content, pH, total alkalinity, bicarbonate alkalinity, and the sum of volatile fatty acids (VFAs). The threshold value of VFAs for AD instability was 10,000 mg/L, under which the biogas production rate reduced from 0.377 to 0.038 L/L/d, CH4 content decreased from 62.8% to 33.6%, and the proportion of Methanosaeta dropped from 74% to 51.6%. Furthermore, Methanosaeta abundance was greatly sensitive to the sudden variation of VFAs, therefore this kind of archaea could be considered as a warning microbial indicator for acid inhibition. There has been an obvious difference in the functional abundances between bacteria and archaea. This study could provide theoretical guidance for stable operation of biogas projects.

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