Strategic Environmental Research and Development Program (SERDP), Project ER-1554, 146 pp, June 2011
This project focused on measuring and evaluating the architecture, dissolution rate, and impact on groundwater quality of residually trapped tetrachloroethene (PCE) dense nonaqueous-phase liquid (DNAPL) from discrete bedrock fractures and fracture networks constructed at the bench scale. The work showed that residual DNAPL in rock fractures is not well contacted by migrating water, resulting in reduced dissolution rates and persistence of DNAPL sources within the bedrock fractures. Bioaugmentation was effective at substantially enhancing the rate of DNAPL removal, despite dissolved PCE concentrations that were near solubility. Chemical oxidation was shown to be ineffective for treating DNAPL sources in bedrock fractures due to decreases in the effective DNAPL-water interfacial area (as measured using interfacial tracers), likely from oxidation reaction by-products. http://www.serdp-estcp.org/content/download/13967/162347/file/ER-1554-FR
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