Abstract:An electrokinetic remediation unit was constructed to study the effect of electrokinetic treatment time, electrolyte and voltage gradient on the electrokinetic treatment of the uranium contaminated soil. It was found that the remediation unit worked most efficiently when the optimal remediation time was 7 days, electrolyte was the mixture of 0.1 mol/L citric acid with 0.03 mol/L ferric chloride, the voltage gradient was 1 V/cm and electrode was graphite. On this basis, a microbial-electrokinetic remediation unit was constructed by inoculating Acidithiobacillus thiooxide into the electrokinetic remediation unit to study the enhancement effect of microorganisms on electrokinetic remediation of uranium contaminated soil. The results indicated that the removal rates of uranium from soil in electrokinetic remediation unit and microbial-electrokinetic remediation unit were 65.12% and 70.68%, respectively. This study shows that Acidithiobacillus thiooxide can significantly enhance the effect of electrokinetic remediation of uranium contaminated soil, and the microbial-electrokinetic remediation is a promising enhancement method.