电动技术去除剩余污泥中重金属

Removal of heavy metals from residual sludge by electrokinetic remediation technology

电动技术去除污泥中重金属受到多种因素的影响,因此非常有必要探讨适宜的修复参数。本论文系统研究了电解时间、介质pH、强化剂种类、电压和超声振荡时间等因素对电动力学去除剩余污泥中重金属Cu、Zn、Ni、Cr的影响。结果表明,最适宜的电解时间为12 h,最佳介质pH为2,最适电压为1.5 V·cm^-1,最适宜的超声振荡时间为1.0 h。添加EDTA对剩余污泥中Ni的去除效果最佳,最佳添加浓度为0.20 mol·L^-1;添加柠檬酸对剩余污泥中Zn的去除效果最佳,最佳添加浓度为0.25 mol·L^-1;酒石酸对剩余污泥中Cu的去除效果最佳,最佳添加浓度为0.25 mol·L^-1。研究为电动技术去除剩余污泥中重金属的实践提供了理论参考。

The removal of heavy metals from residual sludge by electrokinetic remediation technology is affected by various factors. Therefore, it is necessary to explore suitable repair parameters. The effects of electrolysis time, pH values, type of enhancer, voltage, and ultrasonic oscillation time on the removal of heavy metals from residual sludge by electrokinetics were studied systematically in this paper. The results showed that the optimum electrolysis time was 12 h, the optimum pH was 2, and the optimum voltage was 1.5 V·cm^-1. The most suitable ultrasonic oscillation time was 1.0 h. The addition of EDTA had the best effect on the removal of Ni from residual sludge, and the removal concentration was 0.20 mol·L^-1;The addition of citric acid was the best for the removal of Zn, and the removal concentration was 0.25 mol·L^-1;The addition of tartaric acid was the best for the removal of Cu, and the removal concentration was 0.25 mol·L^-1. The study will provide theoretical reference for the practice of heavy metals removal from residual sludge by electrokinetic remediation technology.