数字农科院2.0

Mitigation of acidification-induced system failure in high-load anaerobic digestion: Mechanistic coherence on the role of zero valent iron-loaded biochar

文献类型： 外文期刊

作者： Wu Zeng;Anina James;Aohua Li;Ziyu Jin;Qiang Liu;Binghua Yan;Yadong Yang;Junyi Ma;Junting Pan

作者机构：

关键词： Continuous stirred tank reactors;Food waste;Long-term;Volatile fatty acids

期刊名称： Chemical Engineering Journal

ISSN： 1385-8947

年卷期： 2025 年 522 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Acidification-induced system failure is a pervasive hindrance to large-scale practical applicability of anaerobic digestion (AD) of high organic content-food wastes. In this study, the effects of zero valent iron loaded-biochar (ZVI-BC) supplementation to a long-term, high organic loaded-AD in semi-continuous stirred tank reactors (CSTR) were determined. ZVI-BC was characterized to ensure successful loading of ZVI on BC. The average daily methane yield in control (CK) reduced to 1.01 ± 2.04 mL/g VS at organic loading rate (OLR) 12 g VS/L/d, while it was 350.16 ± 99.64 mL/g VS in the reactor (T1) supplemented with 3 % total solids (TS) of ZVI-BC. The cumulative methane production of T1 (6026 L) was 114 % higher than CK (2811 L). While high OLR caused acidification-induced system failure in CK, T1 showed stable methane output. The abundance of acid-producing bacteria was 205.63 times lesser in T1 than in CK during high OLR of 12 g VS/L/d. There was presence of VFA-oxidising bacteria, Syntrophomonas detected in T1, which are known to have a syntrophic association with Methanothrix, the dominant methanogen detected in this study. Metagenomic analyses revealed that the sustained methane yield observed in T1 even during high OLR could be attributed to both acetoclastic and hydrogenotrophic methanogenesis. Hence, the prevention of acidification, adequate metabolism of VFAs, and stable production of methane during high OLR was due to the adequate supplementation of ZVI-BC, indicating the potential application of this additive for long-term, industrial-scale biogas plants.

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