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Containing Bauxite Liquor Using Bentonite-Polymer Composite Geosynthetic Clay Liners

  • Kuo Tian
  • Craig H. Benson
Conference paper
Part of the Environmental Science and Engineering book series (ESE)

Abstract

Experiments were conducted to evaluate the hydraulic conductivity of geosynthetic clay liners (GCLs) to bauxite liquor from aluminum refining. Tests were conducted with a GCL containing conventional sodium-bentonite (Na-B) and one GCLs containing a bentonite-polymer composite. B-P has polymer loading of 6.8%. Hydraulic conductivity tests were conducted on the GCLs with bauxite liquor in flexible-wall permeameters following procedures in ASTM D6766. The bauxite liquor used in the experiments has pH 13 and ionic strength = 700 mM. Hydraulic conductivity of the Na-B GCL increased to approximately 10−7 m/s during permeation, whereas the B-P GCL maintained low hydraulic conductivity (~ 4.3 × 10−12 m/s). Suppression of bentonite swelling by the bauxite liquor is the primary factor responsible for the higher hydraulic conductivity of the Na-B GCL. Low hydraulic conductivity of the B-P GCL to bauxite liquor is attributed to polymer clogging intergranular pores controlling flow of bauxite liquor through the GCL. The findings indicate that B-P GCLs with sufficient polymer loading can be used effectively in composite liners for disposal facilities containing bauxite liquor.

Keywords

Bauxite liquor Bentonite-polymer composite Geosynthetic clay liner Hydraulic conductivity 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.George Mason UniversityFairfaxUSA
  2. 2.University of VirginiaCharlottesvilleUSA

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