摘要
Abstract
The reverse osmosis concentrated water from refining wastewater has the characteristics of high salinity,high pollution,and difficult biochemical degradation,making it difficult to treat with conventional processes.The electrochemical method was used to treat concentrated reverse osmosis water from refining wastewater,and the optimal electrochemical conditions were determined through single factor experiments.The results showed that using tin antimony plates and iron plates as anodes and cathodes,sodium sulfate as electro-lyte,and setting the anode cathode area ratio to 1.5∶1,the removal rates of TOC and TN could reach 46%and 35%,respectively.Further optimization of electrochemical conditions indicated that excessive current density promoted the occurrence of side reactions in water electrolysis and reduced the electron utilization efficiency of organic matter degradation.Although electrolytes can increase conductivity,excessive addition can lower elec-trode potential and affect the degradation efficiency of organic matter on the anode surface.The alkaline system was conducive to the production of·OH,but an increase in pH can lead to the mineralization products of or-ganic matter existing in the form of CO2-3,quenching·OH and reducing oxidation performance.Therefore,when the current density was 20.0 mA/cm2,the SO2-4 concentration was 9.0 g/L,the pH was 8.5,and after e-lectrolysis for 2.5 h,the effluent TOC and TN concentrations were 15 mg/L and 14 mg/L,respectively,with the highest removal rates of 56%and 55%.The experimental results showed that electrochemical treatment can effectively reduce the pollution load of reverse osmosis concentrated water in refining wastewater,alleviate the treatment pressure of conventional processes,and provide technical support for achieving zero discharge of wastewater in refining enterprises.关键词
反渗透浓水/电化学/单因素/TOC去除率/TN去除率Key words
reverse osmosis concentrated water/electrochemistry/single factor/TOC removal rate/TN re-moval rate分类
环境科学
