改性二氧化铅电极电氧化降解焦化废水

焦化废水中氨氮和COD(化学需氧量)无法通过生化处理达到排放和回用标准,采用改性二氧化铅电极(ESIXPb-I)对其进行电化学降解实现废水零排放,并考察了电流密度、初始pH值及氯离子浓度对降解的影响。研究结果表明,ESIXPb-I电极提高了Ti/PbO2电极的稳定性和析氧电位,显著降低了电荷转移电阻与膜电阻。ESIXPb-I电极降解焦化废水30 min后,氨氮与COD去除率均达到100%,该降解过程符合伪一级动力学。

Electro-Oxidative Degradation of Coking Wastewater with ESIXPb-I Electrode

The content of ammonia nitrogen and Chemical Oxygen Demand(COD)in coking wastewater cannot meet the discharge and reuse standards through biochemical treatment.Zero discharge of wastewater was acheived by electorchemical degradation using modified lead dioxide electrode(ESIXPb-I).At the same time,the effects of current density,initial pH value and chloride concentration on degradation of coking wastewater were explored.The results show that the ESIXPb-I electrode improves the stability and oxygen evolution potential of the Ti/PbO2 electrode,and significantly reduces the charge transfer resistance and membrane resistance.Furthermore,the removal efficiency of both ammonia nitrogen and COD reaches 100%after degradation of coking wastewater by ESIXPb-I electrode for 30 min,which is in accordance with pseudo-first-order kinetics.