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Reverse electrodialysis (RED) is a method of power generation that converts the energy of salt difference between two solutions of different concentrations into electrical energy. There is a lot of NO3- in the denitrification wastewater produced by the power plant, and by using RED, the denitrification wastewater can be used as a feed solution for power generation. However, the impurity ions in the wastewater will have an impact on the power generation efficiency. In this paper, the impurity ions in denitrification wastewater provided by a power plant were measured, and the current, voltage and internal resistance at different temperatures were obtained by adding different salt solutions to the measurement. The order of opencircuit voltage at the same temperature is denitrification wastewater + NaCl > denitrification wastewater + KCl > denitrification wastewater + Na2SO4 > denitrification wastewater + MgCl2 > denitrification wastewater + CaCl2, and the order of the effect on the internal resistance of the membrane stack is denitrification wastewater + NaCl ＜ denitrification wastewater + KCl < denitrification wastewater + MgCl2 ＜ denitrification wastewater + Na2SO4＜ denitrification wastewater + CaCl2. The order of maximum output power density is denitrification wastewater + NaCl > denitrification wastewater + KCl > denitrification wastewater + Na2SO4 > denitrification wastewater + MgCl2 > denitrification wastewater + CaCl2By adding salt solution to increase the denitrification wastewater of different impurity ion content on the open-circuit voltage, internal resistance, power density of the comparison of the impact of impurity ions on the power generation efficiency of the unfavourable effects of the order of Ca2+>Mg2+>SO4 2->K+>Na+ , so in the use of denitrification wastewater for reverse electrodialysis power generation, it should be given priority to the removal of Ca2+, Mg 2+, and other bivalent ions.
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