Advertisement

Effect of Consolidation on VOC Transport Through a GM/GCL Composite Liner System

  • Hefu Pu
  • Charles D. Shackelford
  • Patrick J. Fox
Conference paper
Part of the Environmental Science and Engineering book series (ESE)

Abstract

This paper presents the results of a numerical investigation of the transport of a volatile organic compound (VOC) through a composite liner system comprising a geomembrane (GM) overlying and in intimate contact with a geosynthetic clay liner (GCL), which is commonly used as an engineered barrier for containment of solid waste. The simulations were performed using the established CST2 model (i.e., Consolidation and Solute Transport 2). The results are presented in the form of VOC mass flux, cumulative VOC mass outflow, and distribution of VOC concentration within the GCL. Consolidation of the 10-mm-thick GCL is shown to result in a decrease in the thickness, void ratio, and effective diffusion coefficient of 41%, 49%, and 72%, respectively, such that the steady-state TCE mass flux and cumulative TCE mass outflow at the bottom of the GCL decreased by 47% and 43%, respectively, relative to results for traditional diffusive simulations that ignore the effect of consolidation. Thus, despite the thinness of the GCL, the effect of consolidation on the transport properties of the GCL can result in a significant decrease in VOC transport through a composite GM/GCL liner system.

Keywords

Consolidation Contaminant transport Geomembrane Geosynthetic clay liner Numerical modelling 

Notes

Acknowledgements

Financial support for this research was provided by the National Natural Science Foundation of China (Grant No. 51678268) and the U.S. National Science Foundation (Grant Nos. CMMI-1001023, CMMI-0969346, and CMMI-1622781). This support is gratefully acknowledged.

References

  1. Foose GJ (2002) Transit-time design for diffusion through composite liners. J Geotech Geoenvironmental Eng 128(7):590–601CrossRefGoogle Scholar
  2. Fox PJ (2007a) Coupled large strain consolidation and solute transport. I: Model development. J Geotech Geoenvironmental Eng 133(1):3–15CrossRefGoogle Scholar
  3. Fox PJ (2007b) Coupled large strain consolidation and solute transport. II: Model verification and simulation results. J Geotech Geoenvironmental Eng 133(1):16–29CrossRefGoogle Scholar
  4. Fox PJ, Berles JD (1997) CS2: a piecewise-linear model for large strain consolidation. Int J Numer Anal Methods Geomech 21(7):453–475CrossRefGoogle Scholar
  5. Fox PJ, Lee J (2008) Model for consolidation-induced solute transport with nonlinear and nonequilibrium sorption. Int J Geomech 8(3):188–198CrossRefGoogle Scholar
  6. Kang JB, Shackelford CD (2010) Consolidation of a geosynthetic clay liner under isotropic states of stress. J Geotech Geoenvironmental Eng 136(1):253–259CrossRefGoogle Scholar
  7. Kim JY, Edil TB, Park JK (2001) Volatile organic compound (VOC) transport through compacted clay. J Geotech Geoenvironmental Eng 127(2):126–134CrossRefGoogle Scholar
  8. Lake CB, Rowe RK (2004) Volatile organic compound diffusion and sorption coefficients for a needle-punched GCL. Geosynth Int 11(4):257–272CrossRefGoogle Scholar
  9. Lerman A (1978) Chemical exchange across sediment-water interface. Annu Rev Earth Planet Sci 6:281–303CrossRefGoogle Scholar
  10. Lewis TW, Pivonka P, Smith DW (2009) Theoretical investigation of the effects of consolidation on contaminant transport through clay barriers. Int J Numer Anal Methods Geomech 33(1):95–116CrossRefGoogle Scholar
  11. Petrov RJ, Rowe RK (1997) Geosynthetic clay liner (GCL) – chemical compatibility by hydraulic conductivity testing and factors impacting its performance. Can Geotech J 34(6):863–885CrossRefGoogle Scholar
  12. Pu H, Fox PJ, Shackelford CD (2016a) Assessment of consolidation-induced contaminant transport for compacted clay liner systems. J Geotech Geoenvironmental Eng 142(3):04015091CrossRefGoogle Scholar
  13. Pu H, Shackelford CD, Fox PJ (2016b) Assessment of consolidation-induced VOC transport for a GML/GCL composite liner system. J Geotech Geoenviron Eng 142(11):04016053CrossRefGoogle Scholar
  14. Sangam HP, Rowe RK (2001) Migration of dilute aqueous organic pollutants through HDPE geomembranes. Geotext Geomembr 19(6):329–357CrossRefGoogle Scholar
  15. Sleep BE, Shackelford CD, Parker JC (2006) Modeling of fluid transport through barriers (Chapter 2). In: Chien CC, Inyang HI, Everett LG (eds) Barrier systems for environmental contaminant containment and treatment. CRC Press, Boca Raton, pp 71–141Google Scholar
  16. Xie H, Yan H, Feng S, Wang Q, Chen P (2016) An analytical model for contaminant transport in landfill composite liners considering coupled effect of consolidation, diffusion, and degradation. Environ Sci Pollut Res 23(19):1–14CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Hefu Pu
    • 1
  • Charles D. Shackelford
    • 2
  • Patrick J. Fox
    • 3
  1. 1.Huazhong University of Science and TechnologyWuhanChina
  2. 2.Colorado State UniversityFort CollinsUSA
  3. 3.Pennsylvania State UniversityUniversity ParkUSA

Personalised recommendations