Experiment on combined electrokinetic remediation with PRB of cadmium contaminated groundwater
电动与渗透反应格栅联合修复镉污染地下水实验

The efficiency of electrokinetic remediation of cadmium contaminated groundwater was researched by means of experiments in this paper, and the migration and variation characteristics of cadmium was analyzed too. The experimental results indicated that the pH value varied obviously during the electrokinetic remediation because of the oxidation and reduction near the electrodes, and the pH value near the positive electrode changed from 7.0 in initial stage to 6.8 at later stage, and the pH value was on the contrary near the negative electrode, namely, changed from 6.9 in the beginning to 9.1 in the last, which made known that the condition of acidity and alkalinity in soil varied clearly. The variation of cadmium concentration made known that the migration of heavy metal was weak in the aquifer and the removal efficiency of cadmium near the positive electrode was only 8.4% in the condition of natural permeation, but the concentration of heavy metal varied obviously in groundwater under the electric field, and the heavy metal pollutant could be enriched and removed in the vicinity of electrode. The removal efficiency of cadmium in the groundwater near the positive electrode was 72.9% when the experimental intensity of electric field was 0.5 V/cm, which indicated that the effect of electrokinetic remediation of cadmium contaminated groundwater was evidently higher than that in the condition of natural permeation.