Electrochemical decolorization is of particular importance for the efficient treatment of dye wastewater. A promising electrochemical system powered by microbial fuel cells (MFCs) and intensified by Fe-C micro-electrolysis is proposed and enhanced decolorization of methyl orange (MO) is realized in this study. The decolorization efficiency reached as high as 97.1 ± 1.8% after 180 min of operation with initial MO concentration of 50 mg/L and applied voltage of 700 mV. Decolorization efficiency initially increased and then decreased with rising Fe-to-C ratio. In addition, efficiency was enhanced with the increase of aeration rate up to 6.0 L/min. Lower initial MO concentration and pH were also shown to facilitate MO decolorization. A study of mechanisms, with results from control tests and scavenger experiments indicated that MO decolorization was contributed by the indirect oxidation by various oxidizing substances, especially O₂⁻, that were generated during the process. MO molecule was decomposed and low molecular weight compounds such as indolizine, hydrazide and thione were generated. This study advances the performance of MFC in dye wastewater treatment by combining with a standard technique.

电化学脱色对于高效处理染料废水特别重要。提出了一种有前途的由微生物燃料电池（MFCs）驱动并由Fe-C微电解增强的电化学系统，并在此研究中实现了增强的甲基橙（MO）脱色。在初始MO浓度为50 mg / L和施加电压为700 mV的情况下，运行180分钟后，脱色效率高达97.1±1.8％。脱色效率最初随着Fe / C比的增加而增加，然后降低。此外，随着通气量增加至6.0 L / min，效率得到了提高。还显示出较低的初始MO浓度和pH值有助于MO脱色。对机制的研究，ø ₂ ^-时，处理过程中生成的。MO分子被分解，生成了低分子量的化合物，如吲哚嗪，酰肼和硫酮。这项研究与标准技术相结合，提高了MFC在染料废水处理中的性能。