Remediation of DNAPL-Contaminated Subsurface Systems Using Density-Motivated Mobilization
(2000) Environmental Science & Technology (Washington) — Vol. 34, n° 4, p. 719-724 (2000)
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- Abstract
- Dense nonaqueous phase liquids (DNAPLs), especially when present as trapped free-phase pools, are long-lived in the subsurface environment and extremely difficult to remove. Despite vigorous research efforts over the last two decades, all current DNAPL pool remediation strategies suffer from a combination of inefficiency, increased risk of contaminant spreading due to uncontrolled mobilization, and or high treatment costs. This work reports results from two novel strategies that use density-motivated approaches to mobilize DNAPLs. Experiments were conducted in one-dimensional bench-scale columns and two-dimensional flow cells containing heterogeneous media and DNAPL pools to quantify removal efficiency. Results show that greater than 90% removal of the total DNAPL mass (including both pools and associated residuals) is possible. Further, the removal process is potentially safe and rapid: since it is a stable displacement strategy, it does not rely upon any mass transfer limited steps, and it can be applied using a total of less than one pore volume of flushing solution.
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Miller, C. T., Hill, E. H., & Moutier, M. (2000). Remediation of DNAPL-Contaminated Subsurface Systems Using Density-Motivated Mobilization. Environmental Science & Technology (Washington), 34(4), 719-724. https://doi.org/10.1021/es990808n (Original work published 2000)