Abstract
Recently, the waste water treatment has received a great attention from the scientific community. By considering various harmful dyes, this paper demonstrates the fabrication of a microbial fuel cell (MFC)-microbial electrolysis cell (MEC) coupling system. Herein, nano-zero-valent iron (nZVI) is used as a reinforcing agent for the degradation of wastewater. Degradation experiments of azo dye wastewater were carried out using MFC-MEC coupling system. The results demonstrate that the MFC-MEC coupling system improves the decolorization rate of azo dye by 35% compared with MFC alone. The anode substrate concentration of the biofuel cell has a significant effect on the degradation of the azo dye by the MFC-MEC coupling system. However, the cathode PH has little effect on the degradation of the azo dye by the MFC-MEC coupling system. The current output of the MFC-MEC coupled system is tested. The results show that the coupling system's degradation ability depends on the short-circuit current relationship between MFC-MEC. The MFC-MEC coupling system and nZVI form a system. The nZVI concentration, pH, and initial dyeing wastewater X-3B concentration are used as variables. A large number of experiments confirmed that the decolorization effect of MFC-MEC/nZVI system on printing and dyeing wastewater X-3B is significantly better than that of nZVI treatment alone.