China Nonferrous Metallurgy

Aiming at the characteristics of electrocatalytic oxidation technology in the treatment of salty wastewater with strong oxidation ability, simple equipment, and no secondary pollution, this article uses electrocatalytic anodes of different materials to compare and analyze the treatment of high-salt wastewater containing organic matter produced by hydrometallurgy. The results show that the order of the anode oxygen evolution overpotential of different materials is Ti/Ta₂O₅-IrO₂ electrode＞graphite electrode＞Ti/RuO₂-IrO₂ electrode; The COD removal efficiencies of the three electrodes for treating high-salt wastewater are 62.0%, 43.7%, and 49.6%, and the COD removal energy consumption are 16.7, 61.7 and 41.5W·h/mg. Although the treated wastewater still contains a certain concentration of COD, the negative impact on the subsequent evaporative crystallization of sodium sulfate is significantly reduced.