Volume 36 Issue 1
Jan.  2023
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Article Navigation >  Research of Environmental Sciences  > 2023  >  36(1): 72-80
CHAI Lina, ZHANG Wenwen, XU Duanping, LI Xiaodong, SHEN Jialun, SUN Zongquan, MA Fujun, GU Qingbao. Effects of Conditioners on Thermal Desorption of Clay Soil Contaminated with Polycyclic Aromatic Hydrocarbons[J]. Research of Environmental Sciences, 2023, 36(1): 72-80. doi: 10.13198/j.issn.1001-6929.2022.11.08
Citation: CHAI Lina, ZHANG Wenwen, XU Duanping, LI Xiaodong, SHEN Jialun, SUN Zongquan, MA Fujun, GU Qingbao. Effects of Conditioners on Thermal Desorption of Clay Soil Contaminated with Polycyclic Aromatic Hydrocarbons[J]. Research of Environmental Sciences, 2023, 36(1): 72-80. doi: 10.13198/j.issn.1001-6929.2022.11.08
shu

Effects of Conditioners on Thermal Desorption of Clay Soil Contaminated with Polycyclic Aromatic Hydrocarbons

doi: 10.13198/j.issn.1001-6929.2022.11.08
  • 1.

    College of Resources and Environment Engineering, Liaoning Technical University, Fuxin 123000, China

  • 2.

    Department of Soil Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China

Funds:  National Key Research and Development Program of China (No.2019YFC1803800)
  • Received Date: 2022-09-28
  • Rev Recd Date: 2022-11-12
    Abstract
  • Clay soil with fine particles and low permeability affects the thermal desorption efficiency of polycyclic aromatic hydrocarbons (PAHs) in contaminated clay soil. Therefore, six conditioners (CaO, MgO, Al2O3, Fe2O3, K2CO3 and zeolite) were selected to improve the clay soil and the thermal desorption efficiency of the PAHs-contaminated clay soil in this study. The effects of the conditioners on the plasticity index, pH, cation exchange capacity, and particle size of the modified clay soil were investigated, and the mechanisms of the effects of the conditioners on the thermal desorption of the PAHs-contaminated clay soil were discussed. The results showed that: (1) The addition of the six conditioners improved the thermal desorption efficiency of the PAHs-contaminated clay soil, effectively increased the removal of the total PAHs, and significantly reduced the residual concentrations of benzo[a]anthracene (Baa) and benzo[a]pyrene (Bap). The highest removal rate of total PAHs was up to 97.48% when 10% CaO was added to the clay soil. (2) After adding 6% CaO, MgO, and K2CO3 to the clay soil, the plasticity index of the clay soil decreased from 18.55% to 14.38%, 13.58%, and 15.25%, respectively. However, the addition of Al2O3, Fe2O3, and zeolite increased the plasticity index of the clay soil. (3) The improvement of the clay soil by the conditioners was mainly attributed to the cation exchange and flocculation. The results showed that the conditioners changed the fine grain content and cation exchange capacity of the clay soil, which affected the plasticity index and improved the thermal desorption efficiency of PAHs. In summary, CaO, MgO and K2CO3 could be suitable conditioners.

     

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