生物炭促进了微生物铁的减少,在无氧消化过程中与甲生成竞争
Yafei Cheng1, Zhijian Shi1, Yan Shi1
1Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
Bioresource technology
|July 28, 2023
概括
生物炭的添加增强了微生物的铁 (III) 减少,在无氧消化过程中超越了甲基生成. 氧化显著增加了铁的减少,降低了甲的产量,改善了vivianite的恢复.
科学领域:
- 环境微生物学 环境微生物学
- 生物地质化学生物地质化学
- 无氧消化消化无氧消化
背景情况:
- 微生物的铁 (III) 减少在热力学上有利于甲生成,但由于铁在无氧消化过程中的生物可用性而受到限制,这会影响维亚尼特的恢复.
- 生物炭是一种富含碳的材料,可以改变微生物过程和无氧系统中的基质生物可用性.
研究的目的:
- 调查不同生物炭 (Pyrochar和Hydrochar) 对微生物铁 (III) 减少和甲基生成之间的竞争的影响.
- 在无氧消化过程中识别增强铁 (III) 降解和维亚尼特回收的生物炭特性.
主要方法:
- 铁 (III) 减少和甲生产与不同生物炭修正案的比较.
- 分析生物炭的特性,包括导电性和表面功能群.
- 基因组为中心的转录基因组学,以评估微生物社区的转移和基因表达.
主要成果:
- 与对照组 (29.1%) 相比,在500°C (P5) 产生的烟显著增加了铁 (III) 减少率,达到80.3%.
- P5降低了甲产量9.4%,并且与增强的直接电子转移有关.
- 转录基因组学揭示了Geobacter soli A19的丰富,以及关键的外膜细胞染色体和pilA的上调表达.
结论:
- 焦炭,特别是P5,在无氧消化过程中有效地促进微生物的铁 (III) 减少,而不是甲基生成.
- 生物炭上增强的导电性和含有氧的表面功能群促进了直接的物种间电子转移.
- 在生物炭介导的铁 (III) 减少中,Geobacter soli A19通过升调的外膜细胞染色体和pilA表达起着至关重要的作用.
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