纳米Fe3O4促进丙酸驯化体系的甲烷生成

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-04-30 DOI:10.1016/j.biortech.2025.132608

Fangzhou Wang , Ge Song , Mou Zhang , Shunan Zhao , Tuo Wang , Kai Zhao , Xin Wang , Ruiping Liu

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引用次数: 0

摘要

丙酸积累在厌氧消化系统中很常见，而Fe3O4纳米颗粒（Fe3O4 NPs）显示出指导直接种间电子转移（DIET）以促进丙酸产甲烷的潜力。然而，Fe3O4 NPs对稳定微生物群落的影响尚不清楚。本研究通过批量试验证明，1.0 g/L Fe3O4 NPs可使冲击负荷后丙酸降解和甲烷产量分别提高220%和55%的丙酸驯化微生物群落。高浓度的丙酸抑制了Geobacter，但Fe3O4 NPs使替代饮食参与者（Arcobacter, Syntrophobacter）和甲烷菌（Methanothrix, Methanobacterium）之间的电子协同作用成为电子通道。网络分析进一步揭示，Fe3O4 NPs激活了潜在电活性微生物之间的相互作用，突出了潜在普遍存在的电子合胞作用。即使在丙酸胁迫下的微生物群落中，Fe3O4 NPs也可以快速激活这种相互作用，为减轻丙酸积累和提高沼池性能提供了一种实用的解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Fe3O4 nanoparticles promote methanogenesis in propionate acclimated system

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Fe3O4 nanoparticles promote methanogenesis in propionate acclimated system

Propionate accumulation is common in anaerobic digestion systems, while Fe₃O₄ nanoparticles (Fe₃O₄ NPs) show potential in steering direct interspecies electron transfer (DIET) to facilitate methanogenesis from propionate. However, the effect of Fe₃O₄ NPs in stable microbial communities remains unclear. This study demonstrated that 1.0 g/L Fe₃O₄ NPs enhanced propionate degradation and methane production by 220 % and 55 % of the propionate-acclimated microbial consortia post-shock loading, as evidenced by batch-test. High propionate concentrations suppressed Geobacter, yet Fe₃O₄ NPs enabled electron syntrophy between alternative DIET-participants (Arcobacter, Syntrophobacter) and methanogens (Methanothrix, Methanobacterium) serving as electron conduits. Network analysis further revealed that Fe₃O₄ NPs activated interactions among potential electroactive microbes, highlighting the potentially ubiquitous presence of electron syntrophy. Even in propionate-stressed microbial communities, such mutualism may be rapidly activated by Fe₃O₄ NPs, offering a practical solution for mitigating propionate accumulation and enhance digester performance.

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.