Treatment ofhigh chlorine-containing refractory industrial wastewater using reactive electrochemical membrane coupled with electro-oxidation and reduction processes
Traditional biochemical-derived treatment processes struggle to effectively remove refractory organic matter from industrial wastewater,and the effluents often fail to meet discharge standards and reuse requirements.In this study,the feasibility of employing a novel reactive electrochemical membrane(REM)technique to treat industrial wastewater containing high levels of chlorine was assessed in terms of electrode material,treatment efficiency,byproduct generation and inhibition.The results indicated that among the commonly used electrode materials,SnO2-Sb REM anodes exhibited an approximately 9％～17％higher removal rate of organic matter than Ti4O7 REM anodes.Spectroscopic analysis indicated effective oxidation of humic acids,aromatic compounds,and conjugated macromolecules.During the oxidation process,the quenching effects of high concentrations of chloride ions(Cl-)weakened the contributions of·OH radicals.As a result,the original organic compounds were primarily decomposed through direct electron transfer(DET).Subsequently,the DET process combined with the generated active chlorine realized further wastewater oxidization.The developed REM system,which coupled electrooxidation and reduction processes,could effectively remove organic matter and suppress the generation of ClO3-and ClO4-.After 4 h treatment,the effluent COD stabilized at 80 mg·L-1,and ClO3-and ClO4-stabilized at 90 mg·L-1 and 0.25 mg·L-1,respectively.With energy consumption of only about 7.91 kWh·m-3,the effluent could meet China's discharge regulations,and 100％removal of NH4+-N and NO3--N from the wastewater occurred.Overall,the above results indicated that REM system is a promising technique for treating refractory industrial wastewater with high chlorine content.
万方数据
维普
