UV/Fenton法处理EDTA-Cu-Ni络合废水

为了探索络合态重金属废水的处理方法，采用UV/Fenton氧化技术处理EDTA-Cu-Ni模拟废水，主要研究了Fe2+投加量、H2O2投加量、初始pH和UV光照时间等因素对COD、Cu2+和Ni2+去除效果的影响及机理。结果表明，随着Fe2+和H2O2投加量以及初始pH的升高，COD、Ni2+的去除率先升后降，Cu2+的去除率则在升高后趋于稳定；随着UV光照时间的增加，COD、Cu2+、Ni2+去除效率均呈上升趋势并逐渐达到平衡。结合成本和效率考虑，得出最佳处理条件为：Fe2+投加量为10 mmol·L-1，H2O2投药量为600 mmol·L-1，反应初始pH为3.0，UV光照时间为120 min。在UV/Fenton体系中，UV光照能增强Fenton反应的去除效率，异丙醇对反应的抑制说明羟基自由基在处理过程中是重要的活性物种。

Treatment of EDTA-Cu-Ni wastewater by UV/Fenton method

To explore novel methods for the treatment ofcomplex heavy metal wastewater, the UV/Fenton oxidation was investigated for the removal of EDTA-Cu-Nifrom simulated wastewater.The effects of Fe2+ dosage, H2O2dosage, initial pH, and UV exposure timeon the removal of chemical oxygen demand (COD), Cu2+, and Ni2+ were investigated. COD and Ni2+ removal rates increased with an increase in Fe2+ dosage, H2O2 dosage, andinitial pH,while that of Cu2+increased initially and then became stable. Similarly,with increasing UV exposure time, the removal rates of COD, Cu2+, and Ni2+ increasedbefore becoming stable. Considering the treatment cost and removal efficiency, the optimal conditionsproposed were as follows:Fe2+ dosage=10 mmol·L-1,H2O2dosage=600 mmol·L-1, initial pH=3.0, and UV exposure time=120 min.In addition, in theUV/Fenton system, UV exposure enhanced the removal efficiency of the Fenton reaction.Furthermore, reaction inhibitionby isopropanol suggested that the hydroxyl radical was the main reactive species in thistreatment process.