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摘要：沉积物微生物燃料电池(SMFC)作为一种原位修复手段,既能降解沉积物中有机污染物,又可同时输出电能,具有广阔的应用前景.沉积物的来源和特性对于SMFC的产电及污染物降解性能具有重要影响.本研究采用了不同环境的6种沉积物(VS质量分数为3.1%~12.6%)构建SMFC反应器,研究不同沉积物构建的SMFC的产电性能、有机物去除率以及SMFC液相pH值的变化.实验结果显示,在不外加有机碳源的条件下,只有当沉积物的VS含量较高(12.6%)时,SMFC才可实现稳定产电,最大功率密度为39.6 mW·m^-2.而当沉积物的VS含量较低(<12%)时,SMFC不能实现自发产电.向6种沉积物中投加乙酸钠作为外加碳源,可明显促进产电.在有外加碳源的条件下,具有较高含盐量的沉积物构建的SMFC产电性能较好,其最大功率密度可达到142.3 mW·m^-2.试验还发现,以土壤与厌氧污泥为混合底物的SMFC系统的产电功率密度明显低于纯土壤SMFC系统,显示了厌氧污泥对SMFC产电有抑制作用.

Abstract：Sediment microbial fuel cell (SMFC) is a promising in-situ remediation technology, which can degrade the organic matters and generate power simultaneously. The source and characteristics of the sediment have significant effects on the capacity of power generation and organic matter degradation. SMFC systems were constructed using six kinds of sediments from different environment (VS content ranging from 3.1% to 12.6%). The performance of SMFC systems was analyzed, including capacity of power generation, organic matter removal efficiency and pH variation in the liquid phase of the SMFC systems. Results showed that SMFC system could generate power only under higher VS content (12.6%) without addition of sodium acetate, and the maximum power density was 39.6 mW·m^-2. When the VS content of sediment was lower than 12%, SMFC systems could not generate electricity spontaneously until periodically adding sodium acetate as external carbon source. The highest maximum power density was 142.3 mW·m^-2, which was obtained in the SMFC constructed by the high salinity sediment with external carbon source addition. Compared with the SMFC constructed with lotus pond soil, SMFC system constructed by the mixture of lotus pond soil and anaerobic sludge had lower maximum power density, which revealed that anaerobic sludge significantly inhibited power generation.

Key words：sediment microbial fuel cell polarization curve maximum power density