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Volume 35 Issue 12
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LIU Zhao-peng, DU Yan-jun, JIANG Ning-jun, ZHU Jing-jing. Leaching properties of cement-solidified lead-contaminated clay via semi-dynamic leaching tests[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(12): 2212-2218.
Citation: LIU Zhao-peng, DU Yan-jun, JIANG Ning-jun, ZHU Jing-jing. Leaching properties of cement-solidified lead-contaminated clay via semi-dynamic leaching tests[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(12): 2212-2218.
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Leaching properties of cement-solidified lead-contaminated clay via semi-dynamic leaching tests

  • Institute of Geotechnical Engineering, School of Transportation, Southeast University, Nanjing 210096, China

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  • Received Date: March 19, 2013
  • Published Date: November 30, 2013
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    • Abstract
  • The leaching characteristics of cement solidified/stabilized Pb-contaminated kaolin under different pH of leachant are investigated via a series of semi-dynamic leaching tests as well as quantitative evaluation of the effectiveness of solidification/stabilization treatment in remediating Pb-contaminated kaolin. The designed initial pH of leachant is 2, 4, and 7. The results show that the accumulated leached Pb mass at leachant pH of 2 is 47 to 106 times that at leachant pH of 4 and 7. Nevertheless, the difference of the accumulated leached Pb mass between leachant pH of 4 and 7 is marginal. When cement content increases from 12% to 18%, accumulated leached Pb mass decreases by 28% to 68%, indicating that the increasing cement content will enhance the immobilization of Pb. The diffusion coefficient (De) of Pb is back-calculated by conducting a theoretical analysis of the relationship between the leaching time and the leached mass ratio. It is found that the values of De of Pb at leachant pH of 4 and 7 are very close; and those of Pb at leachant pH of 2 are 3 or 4 orders of magnitude greater than those at the leachant pH of 4 or 7. In addition, an increase of the cement content from 12% to 18% results in a decrease of De by 17% to 99%. The present results indicate that the strong acidic leachant (pH<4) and the increase in cement content have significant influence on the leached mass as well as diffusion coefficient of Pb for the cement-stabilized soils.
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