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Hydraulic Conductivity of Bentonite-Polymer Geosynthetic Clay Liners to Coal Combustion Product Leachates

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

Abstract

Experiments were conducted to evaluate the compatibility of bentonite-polymer (B-P) GCLs to Coal Combustion Product (CCP) leachates. The B-P GCLs were manufactured by dry-mixing polymer and sodium bentonite (NaB). Six synthetic leachates were selected based on database of coal ash leachates. Hydration characteristics (i.e., free swell index) and hydraulic conductivity of B-P GCLs were investigated using deionized water and synthetic leachates. The hydraulic conductivity of B-P GCL with low polymer loading (1.2%) is strongly affected by the ionic strength of leachates and controlled by swelling of bentonite. However, the hydraulic conductivity of B-P GCL with high polymer loading (≥5.1%) is controlled primarily by hydrogel blockage in the pore space. Polymer hydrogel forms reticular structure and bonds free water when hydrated with DI water. However, under 20 mM CaCl2, the reticular structure of polymer hydrogel is inhibited by self-entanglement due to divalent cations and high ionic strength.

Keywords

Bentonite Polymer Coal combustion product Leachate Hydraulic conductivity Swell index Hydration 

Notes

Acknowledgements

The Electric Power Research Institute (EPRI) provided financial support for this study. National Science Foundation of China (41701347) supported the partial travel expenses of Dr. Chen.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Southwest Jiaotong UniversityChengduChina
  2. 2.George Mason UniversityFairfaxUSA
  3. 3.University of VirginiaCharlottesvilleUSA

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