电解-强化微电解耦合法处理含铜废水

Treatment of cupric wastewater by electrolysis-enhanced microelectrolysis coupled method

通过电解-强化微电解耦合法处理模拟含铜废水,考察不同工艺条件对出水Cu2+残留浓度的影响,借助电化学工作站和扫描电子显微镜分析铜离子的还原电沉积过程和结晶过程。结果表明:电解-强化微电解耦合法处理含铜废水的最佳工艺条件为电解电压12 V,pH=4,铁炭质量比为3:1,还原反应后出水Cu2+残留浓度仅为4μg/L,出水水质远优于单独微电解法和单独电解法的,强化微电解反应施加的外电场能推动铜离子电沉积还原峰向正方向移动,降低反应过电位,促进还原反应快速进行,同时,外电场的存在使得活性炭表面电沉积的铜晶体显著细化。

The simulated cupric wastewater was treated by electrolysis-enhanced microelectrolysis coupled method. The influence of different processing conditions on residual Cu2＋ concentration of effluent was studied, the reductive electrodeposition process and crystalline process of copper ion were analyzed by electrochemical workstation and SEM. The results show that the optimum process conditions of electrolysis-enhanced microelectrolysis coupled method are that the electrolyzing voltages is 12 V, pH is 4, and mass ratio of iron to carbon is 3：1. Residual Cu2＋ concentration of effluent is only 4 μg/L, the water quality of effluent is far superior to those of the separate use of microelectrolysis and electrolysis. The external electric field on microelectrolysis padding can make the reduction peak voltage of copper ion move to positive potential, reduce the reactive over voltage, and promote the reduction reaction working quickly. At the same time, the electrodeposited copper crystals on the surface of activated carbon can be refined significantly because of external electric field.