Electrokinetic Extraction Of Cadmium Enhanced By Citric Acid Wastewater

This study processes on electrokinetic remediation for contaminated soil. In order to improve the efficiency of the remediation and save the cost of experiment, Based on the philosophy of “sewage treatment waste”, the study utilizes citric acid pretreated wastewater to enhance the electrokinetic remediation of heavy metal pollution. By building a two-dimensional electrokinetic experimental device, study the influence of voltage, running time and the electrode spacing on repairing effect, try to understand the rules of heavy metal movement, transformation and morphological change in electric field and Optimize of operating conditions. Finally, provide theoretical and technical support for citric acid industrial wastewater as a synergist enhancing electric repair. The main conclusions of this paper include the followings.When adding fortifier into electrokimtic remediation, it can be better to control the soil pH, improve the remediation effect of cadmium. Study the impact of repairing time, the voltage magnitude and the adding way of the citric acid on electrokimtic remediation. The result is that during the electrokinetic remediation process, keeping 120 h repair time,1V/cm voltage and citric acid waste from cathode can boost the remediation effect.Study the form distribution of cadmium in the process of electrokimtic remediation. Cadmium mainly exist in exchangeable form. The secondly is the state of carbonate. After electrokimtic remediation, the exchangeable form reduces significantly. In the anode region, the carbonate and the Fe-Mn-bound state reduces, but in the cathode region, the carbonate and the Fe-Mn-bound state increases. The organic state and the residual state content is few.