Restoration of Cadmium Contaminated Soil Using Approaching Anode Method of Polygonal Electrode

Yushan Wan, Anwei Wang, Meng Shen

Ekoloji, 2019, Issue 107, Pages: 1041-1047, Article No: e107123


Download Full Text (PDF)


In order to explore the effect of moving anode polygonal electrodes in restoring cadmium contaminated soil, the cadmium contaminated soil was prepared at laboratory and a regular hexagon electrode electric restoration experimental device was set up in this study. The repair effect of fixed anode method and approaching anode method was compared and analyzed under the condition of constantly shortening the distance between anode and cathode and the electric field strength being 2 V·cm-1. The results showed that the current variation trend of the fixed anode method was similar to that of the approaching anode method. The variation of pH value of both was basically the same, and the decrease trend of pH value of approaching anode method was significant at the later stage of restoration. After 120 h of electric restoration, for both cases, the content of Cd residue near the anode and in the middle of the soil chamber changed slightly, while that near the cathode increased; the weak acid extraction state and reducible state of Cd near the anode and in the middle of the soil chamber decreased significantly than that before the restoration. The removal rate of Cd at type A2 sampling points by fixed anode method was 68%, and the removal rate of Cd at these points was 95% by approaching anode method. The energy consumption of the approaching anode method was reduced by 65% compared with that of the fixed anode method. The approaching anode method is more effective.


electrokinetic restoration, cadmium pollution, soil, approaching anode method, energy consumption


  • Cao X, Chen Y, Wang X, et al. (2001) Effects of redox potential and pH value on the release of rare earth elements from soil. Chemosphere, 44: 655- 661.
  • Chang J, Wang Y, Shen S (2018) A specific configuration of circulation-enhanced electrokinetics (CEEK) toremediate real-site Cd and Pb contaminated soils. Journal of Hazardous Materials, 359: 408-413.
  • Habibul N, Hu Y, Sheng G (2016) Microbial fuel cell driving electrokinetic remediation of toxic metal contaminated soils. Journal of Hazardous Materials, 318: 9-14.
  • Kim D, Jo S, Choi J, et al. (2012) Hexagonal two dimensional electrokinetic systems for restoration of saline agricultural lands: Apilot study. Chemical Engineering Journal, 198-199: 110-121.
  • Lageman R (1993) Electroreclamation applications in the netherlands. Environmental Science & Technology, 27: 2648-2650.
  • Liu D, Liu F, Miao D (2015) Optimization of soil heavy metal sequential extraction procedures. Geoscience, 29: 390-396.
  • Liu F, Fu R, Xu Z (2015) Optimization of electrode configuration in soil electrokinetic remediation. Environmental Science, 36: 678-685.
  • Liu H, Cang L, Hao X, Wang Y, Zhou D (2016) Field-scale electrokinetic remediation of heavy metal contaminated sites. Chinese Journal of Environmental Engineering, 10: 3877-3883.
  • Liu L, Li W, Song W, Guo M (2018) Remediation techniques for heavy metal-contaminated soils: Principles and applicability. Science of the Total Environment, 633: 206-219.
  • Lu R (2000) Methods of soil agricultural chemistry analysis. Peking University press, 228-235.
  • Selvi A, Aruliah R (2018) A statistical approach of zinc remediation using acidophilic bacterium via an integrated approach of bioleaching enhanced electrokinetic remediation (BEER) technology. Chemosphere, 207: 753-763.
  • Wang Q, Zhou D, Cang L, et al. (2008) Application of bioassays to evaluate a copper contaminated soil before and after a pilot-scale electrokinetic remediation. Environmental Pollution, 157: 410.
  • Xu L, Zhang Y, Dong P, et al. (2017) Effects of cathode electrolyte on electrokinetic remediation of cadmium-contaminated red soil. Research of Environmental Sciences, 30: 257-274.
  • Xu Y, Xu X, Hou H, et al. (2016) Moisture content-affected electrokinetic remediation of Cr (VI)-contaminated clay by a hydrocalumite barrier. Environmental Science and Pollution Research, 23: 6517-6523.
  • Zheng S, Shen Z, Chen X, Wang W (2018) Electrokinetic remediation of heavy metal contaminated soils using enhanced with approaching anodes technique. Journal of Agro-Environment Science, 26: 240-245.
  • Zhou M, Xu J, Zhu S, Wang Y, Gao H (2018) Exchange electrode-electrokinetic remediation of Cr-contaminated soil using solar energy. Separation and Purification Technology, 190: 297-306.