School of Energy and Environment, Southeast University, Nanjing 210096, China.
School of Energy and Environment, Southeast University, Nanjing 210096, China.
Bioresour Technol. 2015;189:87-93. doi: 10.1016/j.biortech.2015.03.148. Epub 2015 Apr 6.
In this study, the soil microbial fuel cells (MFCs) were constructed in the topsoil contaminated with toxic refractory organic pesticide, hexachlorobenzene (HCB). The performance of electricity generation and HCB degradation in the soil-MFCs were investigated. The HCB degradation pathway was analyzed based on the determination of degradation products and intermediates. Experimental results showed that the HCB removal efficiencies in the three groups (soil MFCs group, open circuit control group and no adding anaerobic sludge blank group) were 71.15%, 52.49% and 38.92%, respectively. The highest detected power density was 77.5 mW/m(2) at the external resistance of 1000 Ω. HCB was degraded via the reductive dechlorination pathway in the soil MFC under anaerobic condition. The existence of the anode promoted electrogenic bacteria to provide more electrons to increase the metabolic reactions rates of anaerobic bacteria was the main way which could promote the removal efficiencies of HCB in soil MFC.
在这项研究中，在受有毒难降解有机农药六氯苯（HCB）污染的表土中构建了土壤微生物燃料电池（MFC）。研究了土壤-MFC 中发电和 HCB 降解的性能。基于降解产物和中间产物的测定，分析了 HCB 的降解途径。实验结果表明，三组（土壤 MFC 组、开路控制组和不添加厌氧污泥空白组）中 HCB 的去除效率分别为 71.15%、52.49%和 38.92%。在外阻为 1000 Ω 时，检测到的最大功率密度为 77.5 mW/m(2)。在厌氧条件下，HCB 在土壤 MFC 中通过还原脱氯途径降解。阳极的存在促进了产电菌提供更多电子，从而增加了厌氧细菌的代谢反应速率，这是促进土壤 MFC 中 HCB 去除效率的主要途径。
