Abstract：Controlled experiment, single factor experiment and orthogonal experiment were used to study the electrokinetic optimization of uranium contaminated soil. The uranium removal efficiency increased to 55.73%, with an average leaching toxic concentration of uranium of only 0.07mol/L. After applying a composite electrolyte of 0.20mol/L tartaric acid and 0.05mol/L ferric chloride to the optimized device, the energy utilization efficiency increased to 306.21. Meanwhile, uranium mainly exists in the form of positively charged uranyl ion (UO22+) and a minor amount of neutral uranium-tartrate complex by using Visual MINTEQ software, therefore, due to the synergy of electromigration and forward electrodialysis, the migration direction of uranium is from anode to cathode. Subsequently, the experimental parameters yielding the best removal efficiency in this study were determined to be 0.15mol/L of tartaric acid, 0.08mol/L of ferric chloride, and 1.5V/cm of voltage gradient via orthogonal experiment. In addition, the modified device has the potential to improve the effect of soil remediation by ameliorating soil conductivity, zeta potential and pH levels. Moreover, when utilizing the composite liquid made up of tartaric acid and ferric chloride as the electrolyte in the modified device for repairing soil contaminated with uranium, the energy utilization and removal efficiency were elevated, and the toxicity associated with uranium leaching was substantially reduced. Therefore, an efficient and sustainable in-situ remediation technology for uranium-contaminated soil is provided.
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