Chemical Attack on Liners

Long-term durability evaluations for liners of both clay and geosynthetic membranes require studies of the impact of chemicals on the engineering properties of the liners. The change in hydraulic conductivity of clay barriers due to changes in pore fluid chemistry must be studied if the liner is to successfully perform over the long term. The "compatibility" of geosynthetics with the landfill leachate must be evaluated. In all of these studies it is necessary to accelerate time in order to complete the testing within a reasonable time period. For hydraulic conductivity testing, this acceleration of time is accomplished through the use of high hydraulic gradients. In other studies, more concentrated forms of the contaminants are used. In any case, our ability to predict barrier performance for long time periods is limited as we do not have performance data to verify our models.

Figure 13 Mechanisms of soil-root-pore fluid (leachate) interaction at landfill area. (1) Pore fluid (leachate) in landfill seeps out through root hairs by suction force. (2) Pore fluid (leachate) in landfill seeps out between root and soil by capillary action. (3) Cross section of liner.
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