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摘要
In order to improve the efficiency of electrokinetic remediation of heavy metal combined contamination soils, the corresponding experimental device was constructed to conduct the electrokinetic remediation of simulated soil, the effects of tartaric acid concentration and time on the removal efficiency of heavy metals were studied through two-factor completely random experimental design. The occurrence forms of metals in soils were analyzed and characterized by BCR method. Results showed the heavy metal removal efficiency was significantly improved with the tartaric acid electrolyte compared to the control. The heavy metal removal efficiency was significantly influenced by the tartaric acid concentration and remediation time. The optimized removal efficiency was achieved after 120 h electrokinetic remediation when 0.05 mol?L-1 tartaric acid electrolyte was used, the total removal efficiency of the metals was 86.15%, and the removal efficiencies of Cu, Mn, Cd, Pb and Zn were 75.67%, 98.11%, 85.1%, 70.75% and 90.9%, respectively. BCR analysis results showed that the tartaric acid could improve the fraction of acid extractable state metal in the soil, the immigration capacity of the heavy metal was improved which was benefit for the electrokinetic remediation process. ? 2019, Science Press. All right reserved.
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