超声强化电絮凝处理洗车废水的试验研究

针对洗车行业对水资源的浪费及污染现状,采用超声强化电絮凝处理洗车废水.考察了电流密度、初始pH、极板间距、处理时间等因素对洗车废水处理效果的影响,并讨论了超声强化电絮凝机制.结果表明,超声强化电絮凝处理洗车废水的最佳条件是电流密度1,500 mA/cm2、初始pH无需调节、极板间距为1.5cm、处理20 min,COD与浊度去除率分别为68.77％、96.89％,出水达到《城市污水再生利用城市杂用水水质》(GB/T 18920-2002)要求.可见,超声能改变电絮凝反应动力学过程,强化电絮凝去除污染物效果.

Experimental study on the ultrasound enhanced electro-coagulation for treatment of car-washing wastewater

Series of ultrasound enhanced electro-coagulation treatment were performed on car-washing wastewater in a lab scale reactors to investigate the effect of current density,initial pH,electrodes distance and treatment time on COD removal efficiency.The mechanism of ultrasound enhancement on electro-coagulation was analyzed,and optimum treatment conditions were obtained.The results showed that there was no need to adjust pH during the process of car-washing wastewater treatment,the optimum treatment conditions were electrodes distance 1.5 cm,current density 1.500 mA/cm2 and treated for 20 min.Under these conditions,the removal efficiency of COD and turbidity was 68.77%,96.89%,respectively.The treated water could meet water quality standard for urban water consumption.Furthermore,ultrasound could change the kinetic process of electro-coagulation and then enhance the treatment performance of electro-coagulation.