Hydraulic conductivities and effective diffusion coefficients of geosynthetic clay liners with organobentonite amendments

R. Jason Lorenzetti, Shannon L Bartelt-Hunt, Susan E. Burns, James A. Smith

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Laboratory diffusion and hydraulic conductivity testing were performed on GCLs amended with two different types of organobentonites: Benzyltriethylammonium-bentonite (BTEA-bentonite) and hexadecyltrimethylammonium-bentonite (HDTMA-bentonite) and compared to results for a GCL constructed with conventional sodium bentonite. Results from the hydraulic conductivity testing indicate the addition of both types of organobentonite results in an increase in hydraulic conductivity. Only a small increase in hydraulic conductivity was observed for both types of amended GCLs up to 20% organobentonite amendment. At higher organobentonite contents, measured hydraulic conductivity for both types of amended GCLs rose by as much as three orders of magnitude. The effective diffusion coefficient of [3H]water measured for both the organobentonite-amended GCLs and a laboratory-constructed sodium bentonite GCL were similar and ranged from 3.6 × 10-10 to 5.0 × 10-10 m2/s. One-dimensional benzene solute transport simulations were performed to determine how the observed changes in hydraulic conductivity and diffusion coefficients would affect organic solute transport when coupled with the increased sorptive capacity of the organobentonite-amended GCLs. In general, GCLs modified with BTEA-bentonite resulted in a significant reduction in benzene flux through the GCL compared to the conventional GCL. However, modifying the GCL with HDTMA-bentonite resulted in an increase in solute transport when compared to the conventional GCL.

Original languageEnglish (US)
Pages (from-to)385-400
Number of pages16
JournalGeotextiles and Geomembranes
Volume23
Issue number5
DOIs
StatePublished - Oct 1 2005

Fingerprint

clay liner
Bentonite
Hydraulic conductivity
geosynthetics
bentonite
hydraulic conductivity
Clay
Solute transport
solute transport
Benzene
benzene
Sodium
sodium
Testing
clay
Fluxes
Water
simulation

Keywords

  • Diffusion
  • GCL
  • Hydraulic conductivity
  • Organoclay

ASJC Scopus subject areas

  • Materials Science(all)
  • Geotechnical Engineering and Engineering Geology

Cite this

Hydraulic conductivities and effective diffusion coefficients of geosynthetic clay liners with organobentonite amendments. / Lorenzetti, R. Jason; Bartelt-Hunt, Shannon L; Burns, Susan E.; Smith, James A.

In: Geotextiles and Geomembranes, Vol. 23, No. 5, 01.10.2005, p. 385-400.

Research output: Contribution to journalArticle

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