阴阳极室同时氧化对煤气废水处理效果的研究

Treatment of coal-gas wastewater by cooperative electrochemical oxidation in anodic-cathodic compartment

在棉布隔膜电解槽中,使用Ti/IrO2/RuO2阳极、自制的碳/聚四氟乙烯(C/PTFE)充氧阴极,研究了电化学催化氧化降解煤气废水的效果.结果表明,在阴极室,C/PTFE充氧阴极通过外界曝气提供的O2在阴极还原产生H2O2,采用电子自旋共振法(ESR)阴极室中检测到羟自由基(HO.)的存在.煤气废水中挥发酚和COD去除率均随电解时间的延长而升高、随电流密度的增加而升高,电解质浓度对煤气废水中挥发酚和COD的去除情况没有明显规律性的影响.煤气废水的降解是在阳极的直接、间接氧化及阴极产生的H2O2、HO.和O2-.自由基的氧化共同作用下完成的,阴、阳极室同时电催化氧化降解煤气废水取得了较好的效果.

Electrochemical oxidation of coal - gas wastewater was studied using Ti/IrO2/RuO2 anode and a self - made carbon/polytetrafluoroethylene （C/VI＇FE） O2 - fed cathode in the divided cell with a cotton diaphragm. The result indicated that the two-electron reduction of O2 to hydrogen peroxide （H2O2 ） was produced at the C/PTFE O2 -fed electrode. Hydroxyl radical （HO · ） was determined in the cathodic compartment by electron spin resonance spectrum （ESR）. The removal efficiencies of the volatile phenol and chemical oxygen demand （COD） in the divided cell increased with increasing in current density and electrolysis time, but they were not regularly affected by the electrolyte concentration. The degradation of coal -gas wastewater was supposed to be cooperative oxidation by direct and indirect electrochemical oxidation at the anode and H2O2, HO· , O2^ - · produced by oxygen reduction at the cathode in the divided cell. Therefore, the cooperative electrochemical oxidation of coal -gas wastewater in the anodic -cathodic compartment had better degradation effects.