Nitrification, Denitrification, and Power Generation Enhanced by Photocatalysis in Microbial Fuel Cells in the Absence of Organic Compounds

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• 作者：Xuan Xu ; Bi Zhou ; Fangying Ji ; Qiulin Zou ; Yunsong Yuan ; Zhan Jin ; Deqiang Zhao ; Jun Long
• 刊名：Energy & Fuels
• 出版年：2015
• 出版时间：February 19, 2015
• 年：2015
• 卷：29
• 期：2
• 页码：1227-1232
• 全文大小：372K
• ISSN：1520-5029

文摘

In this study, a novel reactor using a biocathode microbial fuel cell and photocatalysis was designed for simultaneous nitrogen removal and power generation in the absence of organic compounds. To enhance the redox potential of microbial fuel cells, two pieces of conductive glass coated with TiO₂ and SiO₂ were attached to the anode and cathode electrodes, respectively. Nitrification and denitrification occurred in the anode and cathode chambers, respectively. As the sole electron donor, ammonium supported the current production without organic compounds in the anode chamber. In the cathode chamber, the denitrification process occurred with nitrate as the electron acceptor. Moreover, with the effect of ultraviolet irradiation of the conductive glasses, which is in contact with the anode and cathode, nitrification and power generation were both enhanced. The nitrification rate was increased from 0.58 to 1.34 mg L^鈥? h^鈥?, and the denitrification rate was increased from 0.5 to 1.2 mg L^鈥? h^鈥?. In addition, the current generation increased from 0.012 to 0.032 mA (an average current). This study demonstrated that photocatalysis can be applied to enhance the nitrification, denitrification, and power generation in microbial fuel cells in the absence of organic carbon.