State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Bioresour Technol. 2013 Sep;143:669-73. doi: 10.1016/j.biortech.2013.06.050. Epub 2013 Jun 22.
Bioelectrochemical system (BES) that removes recalcitrant pollutant out of wastewater is of special interest for practice. This study modified the configuration of BES to be a sleeve-type with compact structure. Azo dye (acid orange 7, AO7) in the outer cathode chamber performed a complete decolorization by electrons supplied from acetate oxidized with electricigens in the inner anode chamber. The AO7 decolorization efficiency (DEAO7) was enhanced to be higher than 98% from 0.14 to 2.00 mM. Electrochemical impedance spectroscopy (EIS) analysis showed that the internal resistance of anode, cathode and the whole cell was 26.4, 38.3, and 64.6 Ω, respectively, indicating that the modified configuration with large area and small distance between anode and cathode can result in a lower internal resistance and higher decolorization performance. This is the first study for azo dye decolorization using sleeve-type configuration with highly efficient decolorization by abiotic cathode BES.
生物电化学系统（BES）可去除废水中的难降解污染物，因此在实践中具有特殊意义。本研究通过修改 BES 的结构，将其设计为具有紧凑结构的套筒式。在内部阳极室中，电生菌将乙酸盐氧化为电子，为外阴极室中的偶氮染料（酸性橙 7，AO7）提供电子，使其完全脱色。当 AO7 的浓度从 0.14 增加到 2.00 mM 时，AO7 的脱色效率（DEAO7）从 0.14 增加到 2.00 mM，提高到高于 98%。电化学阻抗谱（EIS）分析表明，阳极、阴极和整个电池的内阻分别为 26.4、38.3 和 64.6 Ω，这表明采用大表面积和小阳极与阴极间距的改进构型可降低内阻并提高脱色性能。这是首次利用具有高效脱色性能的非生物阴极 BES 对偶氮染料进行脱色的研究。
