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Mitigating short-circuits through synergistic temperature and hydraulic retention time control for enhancing methane yield in continuous stirred-tank reactors

文献类型： 外文期刊

作者： He, Huiban 1 ; Wang, Ziyu 1 ; Wang, Weiwei 1 ; He, Haoxing 1 ; Yan, Jing 2 ; Wang, Hongliang 1 ; Cui, Zongjun 1 ; Yuan, Xufeng 1 ;

作者机构： 1.China Agr Univ, Coll Agron & Biotechnol, Ctr Biomass Engn, Beijing 100193, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

关键词： Short-circuit; Anaerobic digestion; Temperature; Hydraulic retention time; Methane yield

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： 2024 年 289 卷

页码：

收录情况： SCI

摘要： Temperature and hydraulic retention time (HRT) control are crucial for mitigating the "short-circuit" issue and enhancing methane production in continuous stirred-tank reactors. This study focuses on the combined effects of temperature and HRT on methanation via operating the reactors at different temperatures (35 degrees C, 45 degrees C, and 55 degrees C) and HRT (30, 25, and 20 d) for 116 days. The results demonstrated that the digester conducted at 45 degrees C and an HRT of 30 d unexpectedly yielded the maximum average methane production of 296.08 ml/g volatile solids (VS). In contrast, the optimal HRT for the 35 degrees C and 55 degrees C digesters were 25 and 30 d, with a methane yield of 241.88 ml/g VS and 240.9 ml/g VS, respectively. High-throughput sequencing shows that Firmicutes, Bacteroidetes, Themotogae, Chloroflexi, and Acidobacteria dominated 90-98 % of the total bacteria. Temperature exhibited a significant influence on shaping microbial ecosystems, indicating that temperature, rather than HRT, is the primary factor to consider. Additionally, metagenomic analysis reveals that the levels of genes involved in acetoclastic and hydrogenotrophic methanogenic pathways were enhanced at 45 degrees C, probably improving methane yield. These findings provide new insights into "short-circuit" mitigation and strategies to strengthen methane generation from biomass.

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