School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China.
School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China.
Bioelectrochemistry. 2019 Aug;128:291-297. doi: 10.1016/j.bioelechem.2019.04.019. Epub 2019 Apr 27.
A biocathode microbial fuel cell was constructed to investigate Congo red decolorization and power generation under different cathode operational parameters. The results showed that the suspended sludge in the cathode could improve the performance of the microbial fuel cell for electricity generation but had a negligible effect on the Congo red decolorization. The maximum voltage increased as the aeration rate was increased up to 100 mL/min. At aeration rates of 150 and 200 mL/min, the maximum voltage was lower than that at 100 mL/min. In the meantime, the Congo red decolorization efficiency decreased with increasing cathode aeration rate. These results showed that excessive aeration is not favorable in a bio-cathode microbial fuel cell used for simultaneous Congo red decolorization and electricity generation. The addition of Mn to the biocathode resulted in a 74.5% increase in maximum power density but had no effect on Congo red decolorization. SEM and 16S rRNA sequencing analysis confirmed that Mn was involved in the electrochemical reaction of the biocathode as an electron mediator, and it could induce a difference in the biocathode-attached populations.
构建了一个生物阴极微生物燃料电池，以研究不同阴极操作参数下刚果红的脱色和发电情况。结果表明，阴极中的悬浮污泥可以提高微生物燃料电池的发电性能，但对刚果红的脱色几乎没有影响。随着曝气速率增加到 100mL/min，最大电压增加。在曝气速率为 150 和 200mL/min 时，最大电压低于 100mL/min。同时，随着阴极曝气速率的增加，刚果红的脱色效率降低。这些结果表明，在用于同时进行刚果红脱色和发电的生物阴极微生物燃料电池中，过度曝气是不利的。在生物阴极中添加 Mn 可使最大功率密度提高 74.5%，但对刚果红的脱色没有影响。SEM 和 16S rRNA 测序分析证实，Mn 作为电子介体参与了生物阴极的电化学反应，它可以诱导生物阴极附着种群的差异。
