在阳极孔通道内受限的质量转移会影响微生物电化学系统中电活性生物膜的形成,社区组成和电力生产
Pinpin Yang1, Yaqian Gao1, Naiyu Wang1
1School of Environmental Science and Engineering, Academy of Ecology and Environment, Tianjin University, No 92 Weijin Road, Nankai District, 300072 Tianjin, China.
The Science of the total environment
|July 13, 2023
概括
微生物电化学系统中较大的孔径通过促进电活性细菌的殖民,提高了功率密度. 毛孔边缘质量转移对电流做出了重大贡献,这表明多方向流是优化生物阳极性能的关键.
科学领域:
- 微生物电化学系统 微生物电化学系统
- 生物电化学 生物电化学
- 生物膜工程 生物膜工程
背景情况:
- 多孔阳极增加了微生物电化学系统 (MES) 中电活性细菌的表面积.
- 优化孔隙结构对于提高阳极性能和发电至关重要.
研究的目的:
- 调查毛孔大小和深度对MES多层生物模块性能的影响.
- 分析不同孔径大小的不同深度的电活性生物膜的分子生物学和电化学特性.
主要方法:
- 构建具有不同孔径的多层阳极.
- 对阳极性能进行评估,包括最大功率密度 (Pmax).
- 分析电源殖民深度,生物膜特征和微生物社区组成.
主要成果:
- 最大功率密度随着孔径的增加而增加,孔径为4毫米,产生1.91Wm-2.2的孔径.
- 与较小的毛孔 (0.5毫米) 相比,电致细菌在较大的毛孔 (≥3毫米) 中殖民的深度更大.
- 质量转移的限制影响了生物膜特性和电力输出深度;孔边质量转移贡献了高达75%的电流.
结论:
- 较大的孔径与MES生物电极中的更高功率密度正相关.
- 孔隙结构显著影响电源殖民深度和生物膜性能.
- 在毛孔边缘的多方向质量转移是优化生物电极效率的关键因素.
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