Influence of temperature fluctuations on anaerobic digestion: Optimum performance is achieved at 45 °C

文献类型： 外文期刊

第一作者： Wang, Ziyu

作者： Wang, Ziyu;He, Huiban;Wang, Hongliang;Cui, Zongjun;Yuan, Xufeng;Wang, Ziyu;Yan, Jing;Xu, Zhijie;Yang, Gaoxuan;Zhao, Yunhao;Zhao, Yunhao

作者机构：

关键词： Anaerobic digestion; Temperature change; Microorganism; Metagenome

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2024 年 492 卷

页码：

收录情况： SCI

摘要： This study implemented five successive temperature stages (35 degrees C-45 degrees C-55 degrees C-45 degrees C-35 degrees C) in a continuous stirred tank reactor, designated as D35-1, D45-1, D55, D45-2, and D35-2, respectively. The objective was to probe the mechanism of temperature transformations on methanogenesis performance, microbial community, and metabolic pathways. The suitability of 45 degrees C for anaerobic digestion (AD) under varying temperatures was emphatically expounded. Intriguingly, optimal methanogenesis performance was attained at 45 degrees C, with methane production reaching 238.51 mL/g VS/d in D45-1 and 245.91 mL/g VS/d in D45-2, signifying increases of 17.66% and 21.32% contrasted with D35-2, respectively. Additionally, considerable resistance to temperature shocks at 45 degrees C was also manifested, as evidenced by a recovery time of 2 days in D45-2. At 45 degrees C, an effective balance between hydrolysis and methanogenesis was observed, maintaining a dynamic equilibrium between acetoclastic and hydrogenotrophic methanogenesis. The primary drivers in D45-1 were Caldicoprobacter, Bathyarchaeia, and Methanosarcina, while Anaerolinea and Methanosarcina were the key determinants in D45-2. By contrast, methanogenesis was suppressed at other stages. Therefore, 45 degrees C emerges as a viable alternative to conventional temperatures when confronted with temperature fluctuations to optimize energy efficiency. The results provide novel insights into AD temperature management and pave the way for engineering applications.

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