School of Environmental Science and Engineering, Tianjin University, Weijin Road 92, Tianjin, 300072, China.
School of Environmental Science and Engineering, Tianjin University, Weijin Road 92, Tianjin, 300072, China.
Chemosphere. 2018 Oct;209:739-747. doi: 10.1016/j.chemosphere.2018.06.122. Epub 2018 Jun 18.
A planted sediment microbial fuel cell (PSMFC) is a promising new technology for harvesting energy and remediating a contaminated geo-environment. In this study, the effects of roots (of Acorus tatarinowii) on oxygen profiles in sediment, power generation, and anodic bacterial community were investigated in PSMFCs and unplanted SMFCs with different anode locations to roots. The presence of plant did not improve the electricity generation when roots were placed on the surface of an anode because a high amount of oxygen loss from roots increased the redox potential at anode and made aerobic bacteria co-exit and compete with electrochemically active bacteria in substance utilization. It was suggested to place the anode under the roots with a proper distance, where the PSMFCs made use of root-derived organics, avoiding the negative effects of oxygen loss. Oxygen loss could control the diurnal rhythm of power generation in the PSMFCs.
植入式沉积物微生物燃料电池（PSMFC）是一种很有前途的新技术，可用于收获能源和修复污染的地质环境。在这项研究中，我们研究了在 PSMFC 和无种植 SMFC 中，不同阳极位置的根系（石菖蒲）对沉积物中氧气分布、发电和阳极细菌群落的影响。当根系位于阳极表面时，植物的存在并没有提高发电效率，因为大量的氧气从根系中损失增加了阳极的氧化还原电位，使好氧细菌与电化学活性细菌一起在物质利用中共同出现和竞争。建议将阳极放在根系下方适当的距离处，PSMFC 可以利用根系衍生的有机物，避免氧气损失的负面影响。氧气损失可以控制 PSMFC 发电的昼夜节律。
