Behavior of Geosynthetic Clay Liners due to the Migration of Heavy Metal

Abstract:

To protect the underlying soil and groundwater from landfills, the landfills are commonly lined with layered liner systems. Geosynthetic clay liners (GCL) have been increasingly used in the landfill liner systems to substitude the traditional compacted clay liners (CCL) because of their low cost, easily construction behavior and low leakage rate. To study the behavior of the GM+GCL liner system used in China due to the migration of Pb²⁺, we introduce in detail GM+GCL liner systems proposed by the Chinese specification. Then one dimensional finite layer model is used to investigate the anti-pollution behavior of the CM+GCL composite liner systems, with the focuses on the heavy metal Pb²⁺. It could be concluded that the main migration way through the GM+GCL composite liner system is that the transport of Pb²⁺ through a GM+GCL composite liner system of a landfill cover takes place primarily through the holes in the GM. The findings provide useful reference for preventing, controlling and treating groundwater pollution in the GM+GCL liner system technically and scientifically.

• Periodical: Advanced Materials Research (Volumes 989-994)
• Pages: 433-436
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.989-994.433
• Online since: July 2014
• Authors: Jing Jing Fan*
• Keywords: Behaivor, GCL, Geomembrance, Liner System, Migration

References

[1] Liu CL, Zhang FE, Zhang Y, etc. Experimental and numerical study of pollution process in an aquifer in relation to a garbage dump field. Environmental Geology 2005, 48(8): 1107-1115.

DOI: 10.1007/s00254-005-0052-9

[2] Fan, JJ. Pollutant Migration in the GM+CCL Liner System Considering Leachate Mound. Electronic Journal of Geotechnical Engineering. 2013. Vol 18.

[3] Fan, JJ. Leakage performance of the GM+CCL liner system for the MSW Landfill. The Scientific world Journal. (2014).

DOI: 10.1155/2014/251465

[4] Dickinson S, Brachman RWI: Assessment of alternative protection layers for a geomembrane - geosynthetic clay liner (GM-GCL) composite liner. Canadian Geotechnical Journal 2008, 45(11): 1594-1610.

DOI: 10.1139/t08-081

[5] Rowe RK, Nadarajah P: An analytical method for predicting the velocity field beneath landfills. Canadian Geotechnical Journal 1997, 34(2): 264-282.

DOI: 10.1139/t96-110

[6] Xie HJ, Lou ZH, Chen YM, et al.: An analytical solution to contaminant advection and dispersion through a GCL/AL liner system. Chinese Science Bullutin 2011, 56: 811-818.

DOI: 10.1007/s11434-010-4039-x

[7] Technical code for liner system of municipal solid waste landfill, 2007, China Architecture ＆Building Press: Beijing.

[8] Chen, Y., et al., An analytical solution for one-dimensional contaminant diffusion through multi-layered system and its applications. Environmental Geology, 2009. 58(5): pp.1083-1094.

DOI: 10.1007/s00254-008-1587-3

[9] Zhang J L, Luan M T, Yang Q. Two-dimensional numerical analysis of landfill contaminant migration considering non-linear adsorption. Chinese Journal of Geotechnical Engineering, 2008, 30: 354–360.

[10] Rowe, R., R. Quigley, and R. Brachman, Barrier Systems for Waste Disposal Facilities. 2004, London and New York: Spon Press.

DOI: 10.1201/9781482271935

[11] Jie YX, Peng T, Fu ZB, et al. A study on the permeability of geosynthetic clay liners. China Civil Engineering Journal, 2009, 42: 92–97.