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Effect of Liner Consolidation on Contaminant Transport Through a Landfill Bottom Liner System

  • Hefu Pu
  • Jinwei Qiu
  • Junjie Zheng
  • Rongjun Zhang
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

In municipal solid waste landfills, a triple-layer composite liner consisting of a geomembrane liner (GML), a geosynthetic clay liner (GCL) and a compacted clay liner (CCL) is commonly used at the landfill bottom to isolate the leachates from surrounding environment. This paper presents a numerical investigation of the effect of liner consolidation on the transport of a volatile organic compound (VOC), benzene, through the GML/GCL/CCL composite liner system. The numerical simulations were performed using the model CST3. The performed numerical simulations considered the impact of consolidation on contaminant transport for a GML/GCL/CCL liner system. The simulation results indicate that, depending on conditions, consolidation of the GCL and CCL can have significant impact on the transport results of benzene, both during the consolidation process and long after the completion of consolidation. The traditional approach for the assessment of liner performance neglects consolidation of the liners and fails to consider the consolidation-induced transient advection and concurrent changes in material properties and, therefore, can lead to significantly different results.

Keywords

Consolidation Contaminant transport Compacted clay liner Geosynthetic clay liner Numerical modeling 

References

  1. Pu, H., Fox, P.J.: Model for coupled large strain consolidation and solute transport in layered soils. Int. J. Geomech. 16(2), 04015064 (2016)CrossRefGoogle Scholar
  2. Pu, H., Fox, P.J., Shackelford, C.D.: Assessment of consolidation-induced contaminant transport for compacted clay liner systems. J. Geotech. Geoenviron. Eng. 142(3), 04015091 (2016a)CrossRefGoogle Scholar
  3. Pu, H., Shackelford, C.D., Fox, P.J.: Assessment of consolidation-induced VOC transport for a GML/GCL composite liner system. J. Geotech. Geoenviron. Eng. 142(11), 04016053 (2016b)CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  • Hefu Pu
    • 1
  • Jinwei Qiu
    • 1
  • Junjie Zheng
    • 1
  • Rongjun Zhang
    • 1
  1. 1.School of Civil Engineering and MechanicsHuazhong University of Science and TechnologyWuhanChina

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