Ti/RuO2-IrO2-TiO2电极电解产生活性氯

采用电解法产生活性氯,降解废水中的有机物。考察了活性氯产生量的影响因素,并对Ti/RuO₂-IrO₂-TiO₂电极电解实际含氯废水的处理效果进行了研究。实验结果表明:通过增加Cl^-浓度和电流密度、减少SO₄^2-浓度和极板间距、降低电解温度的方法能够提高活性氯产生量,从而提高电极降解有机物的效果;对于Cl^-浓度为0.005 mol/L、COD为49 mg/L的废水,使用Ti/RuO₂-IrO₂-TiO₂电极,在极板间距为0.5 cm、电解温度为20 ℃、电流密度为20 mA/cm²、初始pH为8.0的条件下电解处理60 min,废水BOD₅/COD值由0.04提高到0.25,COD降至24 mg/L,达到DB 11/307—2013《水污染综合排放标准》中排入地表水体污染物B类排放限值(COD≤30 mg/L)的要求。

Generation of active chlorine by electrolysis with Ti/RuO2-IrO2-TiO2 electrode

Active chlorine was generated by electrolysis to degrade organic compounds in wastewater. The factors affecting the active chlorine generation were investigated,and the treatment effect of actual chlorine-containing wastewater by electrolysis with Ti/RuO₂-IrO₂-TiO₂ electrode on was studied. The experimental results show that:By the method of increasing Cl^- concentration and current density,reducing SO₄^2- concentration and plate spacing,lowering electrolysis temperature,the generation of active chlorine can be increased,and then the degradation effect of organic compounds on electrode is improved;For the wastewater with Cl^- concentration of 0.005 mol/L and COD of 49 mg/L,under the conditions of using Ti/RuO₂-IrO₂-TiO₂ electrode,plate spacing 0.5 cm,electrolytic temperature 20 ℃,current density 20 mA/cm²,initial pH 8.0 and electrolysis time for 60 min,the BOD₅/COD value of the wastewater is increased from 0.04 to 0.24,and COD is decreased to 24 mg/L,which meet the class B discharge limit of pollutants in surface water in local standard DB 11/307-2013 (COD≤30 mg/L).