电化学+超声波去除废水中螯合性铜离子

Removal of Chelated Copper Ions in Wastewater by Electrochemical and Ultrasonic

采用电化学结合超声波对废水中螯合性铜离子的去除进行实验研究,分析在不同pH值、电场强度、超声波震荡输出功率以及超声波震荡方式等条件下的铜离子浓度变化。在不同的pH值时,由于EDTA与铜离子形成不同种类的螯合物,从而影响铜离子的去除,pH值低铜离子去除率高。在不同的电场强度下,铜离子还原速率随着电场强度的增大而加快,但在较高的电场强度下时,铜离子的去除率不再受pH值影响。在pH值为7、电场强度为1.0V/cm条件下引入超声波时,铜离子浓度迅速下降,且超声波输出功率越大,铜离子去除率越高。当输出功率为300W,铜离子去除率为95.6%,比没有超声波时铜离子去除率提升39.9%。超声波的震荡时间、间歇时间与震荡次数均影响铜离子的去除效果。不同的电极组合,铜离子去除率不同,其中以铜+DSA电极组合去除率最高,在特定操作条件下可达98.56%。

Electrochemical combined with ultrasonic on the removal of chelating copper ions in wastewater was studied experimentally.The changes of copper ion concentration under different pH value,electric field intensity,ultrasonic oscillation output power and ultrasonic shock mode were analyzed.At different pH values,EDTA and copper ions form different kinds of chelates,which affect the copper ion reduction rate,pH low copper ion removal rate is high.At different electric field intensities,the reduction rate of copper ions increases with the increase of electric field intensity.At higher electric field intensities,the removal rate of copper ions is no longer affected by pH.At the pH value of 7,the electric field intensity is 1.0V/cm,the concentration of copper ions decreases rapidly when the ultrasonic is introduced,and the higher the ultrasonic output power,the higher the copper ion removal rate.When the output power is 300W,the copper ion removal rate is 95.6%,which is 39.9% higher than that without ultrasonic.Ultrasonic shock time,intermittent time and the number of shocks affect the removal of copper ions.Different electrode combinations,copper ion removal rate is different,which with copper and DSA electrode combination of the highest removal rate,in specific operating conditions up to 98.56%.