Abstract
A composite geomembrane cut-off wall (CGCW) is one of the most efficient technologies for impeding the horizontal migration of contaminants. A two-dimensional analytical model is developed for describing the transient diffusion of an organic contaminant in a CGCW and a contiguous aquifer with adsorption and degradation. This model considers a non-uniformly distributed contaminant source with respect to depth, which is common in practice. The diffusion behavior of an organic contaminant in a CGCW-aquifer system and the service performance of a CGCW are comprehensively investigated. For a normally distributed TOL source with a distribution range σ of 0.2 m, the breakthrough time of a CGCW is 2.95 times longer than that for σ = +∞ (uniform distribution). In addition, the performance of a CGCW can be improved by embedding a thicker geomembrane (GMB) with a lower diffusion coefficient into an optimal location in a bentonite cut-off wall (BCW). Finally, based on a 50-year designed service life, the equivalency between two types of CGCWs with HDPE GMB and EVOH GMB is assessed using the proposed solution. The solution proves to be a suitable tool for the preliminary design of a CGCW.
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