Comparing the effects of magnetite-mediated direct interspecies electron transfer with biogas mixing-driven interspecies hydrogen transfer on anaerobic digestion

被引：5

作者：

Hou Y. ^{[1
,2
]}

Qiu Q. ^{[1
]}

Liu Y. ^{[1
]}

Huang W. ^{[3
]}

Yi X. ^{[1
]}

Yang F. ^{[1
]}

Lei Z. ^{[4
]}

Huang W. ^{[3
]}

机构：

[1] Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, School of Ecology and Environment, Hainan University, 58 Renmin Avenue, Meilan District, Haikou

[2] School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Nankai District, Tianjin

[3] MOE Key Laboratory of Pollution Process and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, 94 Weijin Road, Nankai District, Tianjin

[4] Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki

来源：

Chemosphere | 2024年 / 361卷

基金：

中国国家自然科学基金;

关键词：

Acidification; Hydrolysis; Interspecies electron transfer; Methanogenesis; Swine manure; Syntrophic metabolism;

D O I：

10.1016/j.chemosphere.2024.142416

中图分类号：

学科分类号：

摘要：

Although the promotive effect of direct interspecies electron transfer (DIET) on methane production has been well-documented, the practical applicability of DIET in different scenarios have not yet been systematically studied. This study compared the effects of magnetite-mediated DIET with conventional biogas mixing-driven interspecies hydrogen transfer (IHT) on anaerobic digestion (AD) of swine manure (SM). Compared with control, magnetite supplementation, biogas circulation, and their integration enhanced the CH4 yield by 19.3%, 25.9%, and 26.2%, respectively. Magnetite mainly enriched DIET-related syntrophic bacteria (Anaerolineae and Synergistia) and methanogens (Methanosarcina) to accelerate acidification and establish DIET, while biogas circulation mainly enriched hydrolytic bacteria (Clostridia) and hydrogenotrophic methanogens (Methanolinea and Methanobacterium) to promote hydrolysis and accelerate IHT. Coupling magnetite addition with biogas circulation led to the enrichment of the above six microorganisms to different extents. The effectiveness of the strategies for lowering the H2 pressure followed: magnetite + biogas circulation ≈ biogas circulation > magnetite. Under stress-free environment, the enhancement effect of magnetite-induced DIET was not even as pronounced as biogas circulation—a simple and common mixing strategy in commercial AD plants, and the promotion effect of magnetite was insignificant in the well-mixed digesters. In short, the magnetite-mediated DIET is not always effective in improving AD of SM. © 2024 Elsevier Ltd

引用

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