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Numerical Modeling of Leakage, Transport and Remediation of Mixed DNAPL and LNAPL in the Unsaturated Clayey Soil Underlain by Saturated Sandy Soil

  • Yuzhang Bi
  • Yanjun Du
  • Xingyuan You
  • Kaixuan Yuan
  • Jin Ni
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

The mixed pollution of LNAPL and DNAPL is a common problem in environmental geotechnical engineering. Leakage, migration and extraction of pollutants will affect the distribution of pollutants in the unsaturation and the saturation zone. Furthermore, they will also affect the disposal efficiency of pollutants. The paper mainly focused on the migration of LNAPL under the influence of DNAPL. With the software of T2VOC, the distribution of pollutants under the whole process of “leakage-migration-extraction” was studied, especially about LNAPL. The studies showed that LNAPL will penetrate into the saturation zone through the unsaturation zone with the action of DNAPL, while it is only distributed in the unsaturation zone under the pure LNAPL condition. Meanwhile, with the increase of DNAPL quality ratio, the distribution area of LNAPL in the saturated zone increased accordingly. The study also indicated that extraction process will lead to the increase of LNAPL and DNAPL in some area. The results of the study have practical significance in revealing the migration of pollutants under the mixture conditions of LNAPL and DNAPL in engineering area.

Keywords

Whole process DNAPL and LNAPAL mixture Organic pollution Multi-phase flow T2VOC 

Notes

Acknowledgements

This research was supported by the Fundamental Research Funds for the Central Universities (Postgraduate Research & Practice Innovation Program of Jiangsu Province) (Grant KYCX17_0130).

References

  1. 1.
    Shi, X.Q., Jiang, B.L., Wu, J.C., et al.: Numerical analysis of the effect of leakage rate on dense non-aqueous phase liquid transport in heterogonous porous media. Adv. Water Sci. 23(3), 376–382 (2012)Google Scholar
  2. 2.
    McCray, J.E., Falta, R.W.: Numerical simulation of air sparging for remediation of NAPL contamination. Groundwater 35(1), 99–110 (1997)CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  • Yuzhang Bi
    • 1
  • Yanjun Du
    • 1
  • Xingyuan You
    • 1
  • Kaixuan Yuan
    • 1
  • Jin Ni
    • 1
  1. 1.Institute of Geotechnical Engineering, School of TransportationSoutheast UniversityNanjingChina

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