Department of Environmental Sciences and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.
Department of Environmental Sciences and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.
J Hazard Mater. 2017 Aug 15;336:110-118. doi: 10.1016/j.jhazmat.2017.04.066. Epub 2017 Apr 28.
The soil microbial fuel cells (SMFCs) were constructed to remediate soils contaminated by polycyclic aromatic hydrocarbons (PAHs). With a maximum power density of 12.1mWm and an internal resistance of 470Ω, a closed SMFC showed electricity generation comparable to that by an open SMFC after 175days of operation and meanwhile increased the removal rates of anthracene, phenanthrene, and pyrene to 54.2±2.7%, 42.6±1.9% and 27.0±2.1% from 20.8±1.1%, 17.3±1.2% and 11.7±0.9%, respectively, by the open SMFC. Both the electricity generation and the removal of PAHs increased with the decreased electrode interval. When the electrode interval ranged between 4cm and 10cm, the more closely the electrodes were positioned, the more efficient the electricity generation and removal of PAHs became. Dominated by the genus of Geobacter, the SMFC was enriched in electrogenic bacteria at the anode surface, and the growth of certain microbes other than electrogenic bacteria in the soil was improved by electrical stimulation. This finding reveals the critical mechanism underlying electricity generation and improved the removal of PAHs.
土壤微生物燃料电池（SMFCs）被构建用于修复多环芳烃（PAHs）污染的土壤。在 175 天的运行后，一个封闭的 SMFC 表现出与开放 SMFC 相当的发电能力，最大功率密度为 12.1mWm，内阻为 470Ω，同时将蒽、菲和芘的去除率分别从 20.8±1.1%、17.3±1.2%和 11.7±0.9%提高到 54.2±2.7%、42.6±1.9%和 27.0±2.1%。发电和 PAHs 的去除都随着电极间隔的减小而增加。当电极间隔在 4cm 和 10cm 之间时，电极之间的距离越近，发电和去除 PAHs 的效率就越高。SMFC 在阳极表面富集了以 Geobacter 属为主的产电菌，电刺激改善了土壤中某些非产电菌的生长。这一发现揭示了发电和提高 PAHs 去除的关键机制。
