Volume 7 Issue 1
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Article Navigation >  Journal of Environmental Engineering Technology  > 2017  >  7(1): 59-64
ZHANG Mengmeng, WANG Wanfeng, MA Fujun, ZHANG Qian, GU Qingbao. Effect of cement and activated carbon on solidification/stabilization of PAHs contaminated soil[J]. Journal of Environmental Engineering Technology, 2017, 7(1): 59-64. doi: 10.3969/j.issn.1674-991X.2017.01.009
Citation: ZHANG Mengmeng, WANG Wanfeng, MA Fujun, ZHANG Qian, GU Qingbao. Effect of cement and activated carbon on solidification/stabilization of PAHs contaminated soil[J]. Journal of Environmental Engineering Technology, 2017, 7(1): 59-64. doi: 10.3969/j.issn.1674-991X.2017.01.009
shu

Effect of cement and activated carbon on solidification/stabilization of PAHs contaminated soil

doi: 10.3969/j.issn.1674-991X.2017.01.009
  • 1.

    School of Environment, Henan Normal University, Xinxiang 453007, China

  • 2.

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

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  • Corresponding author: Fujun MA E-mail: mafj@craes.org.cn
  • Received Date: 2016-06-16
  • Publish Date: 2017-01-20
    Abstract
  • As a low cost and easy to operate technology, the solidification/stabilization is widely used for remediating contaminated sites. PAHs leachability and unconfined compressive strength (UCS) of cement-based solidified/stabilized materials with or without activated carbon were evaluated. When the contaminated soil was leached under three scenarios of neutral precipitation, acid precipitation, and co-disposal, the leaching concentrations of PAHs were 2.53, 2.74 and 3.88 μg/L, respectively. After treated by cement of 20% soil weight, the leaching concentrations of PAHs were 8.99, 10.12 and 10.99 μg/L, respectively under the three scenarios. The leachability of PAHs increased when contaminated soil was solidified/stabilized by cement. PAHs concentrations in leachates were in the order of co-disposal scenario>acid-precipitation scenario>neutral-precipitation scenario. When the contaminated soil was treated by 20% cement and 1% activated carbon of soil weight, the leaching concentrations of PAHs was 0.99 μg/L; the addition of activated carbon can significantly lower PAHs concentrations in leachates. 28 d UCS of solidified/stabilized materials was 1.82, 5.95 and 12.06 MPa when the contaminated soil was treated by cement of 10%, 20% and 30% of soil weight, respectively. UCS of solidified/stabilized materials increased with the adding amounts of cement. When the contaminated soil was treated by 20% cement, UCS of solidified/stabilized materials was not affected by the amount of activated carbon when adding no more than 2% of soil weight.

     

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