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Volume 38 Issue 3
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XIA Wei-yi, WEI Ming-li, DU Yan-jun, YU Bo-wei, SONG De-jun. Experimental study on ex-situ S/S for shallow soil of organically contaminated site[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(3): 510-517. DOI: 10.11779/CJGE201603015
Citation: XIA Wei-yi, WEI Ming-li, DU Yan-jun, YU Bo-wei, SONG De-jun. Experimental study on ex-situ S/S for shallow soil of organically contaminated site[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(3): 510-517. DOI: 10.11779/CJGE201603015
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Experimental study on ex-situ S/S for shallow soil of organically contaminated site

  • 1. Institute of Geotechnical Engineering, School of Transportation, Southeast University, Nanjing 210096, China;
    2. Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety (Southeast University), Nanjing 210096, China;
    3. Jiangsu Sentay Environmental Science and Technology Co., Ltd., Nanjing 210007, China

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  • Received Date: December 20, 2014
  • Published Date: March 24, 2016
    Graphical Abstract
    • Abstract
  • 4 kinds of binders are utilized to remedy the organically contaminated soil. The effects of curing age and binder type on physico-mechanical and environmental safety properties of the stabilized soils as well as the remediation efficiencies and mechanisms are studied by analyzing the results of ex-situ S/S and laboratory tests, such as unconfined compression strength tests and toxicity characteristic leaching procedure. The results show that with the increasing age, pH of soil and organic concentrations of leachate decrease while the dry densities and qu increase steadily. The dry densities of soil remedied by binders No. 3 and No. 4 are higher than those by other binders and over 1.38 g/cm3 after 28 days. The pH values of soil greatly increase with the addition of binders and are the highest for binder No. 4 (calcium carbide residue + attapulgite). 4 kinds of binders have different remediation effects on organic contaminants owing to different organic types, and they all have high removal efficiencies for aniline, 2-chlorophenol, naphthalene, benzene, methylbenzene and o-Xylene. In point of the overall effectiveness, activated carbon-based binder No. 1 is the best because its total removal efficiency approaches 93%. The qu of soils stabilized by cement-based binders No. 2 and No. 3 is higher than that of other binders and over 109 kPa after 28 days. Binder No. 4 is optimum for the re-use of organically contaminated soil because of its low cost, low energy consumption, low pollutant emission, high qu and total removal efficiency.
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    • References (20)
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