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FACILITATED TRANSPORT ENABLED IN SITU CHEMICAL OXIDATION OF 1,4-DIOXANE-CONTAMINATED GROUNDWATER
Carroll, K.C., M.L. Brusseau, T.B. Boving, and R. Ball.
SERDP Project ER-2302, 219 pp, 2018

Work was conducted to enhance the solubility, stability, activation, and transportability of strong oxidants (e.g., ozone or O3) to facilitate in situ chemical oxidation (ISCO) for remediating 1,4-dioxane under lab conditions. This goal was achieved through the co-injection of oxidants with chemical agents that facilitate oxidant transport. O3 formed an inclusion complex or partitioned into the delivery agent cyclodextrin, which increased the amount of oxidant delivered. Facilitated transport increased specificity of oxidation for 1,4-dioxane and co-contaminant chlorinated solvents as they also partitioned into the cyclodextrin. Additional methods for stabilizing and activating oxidants were developed by injecting mixtures of oxidants, such as persulfate, and using in situ aquifer materials and solid forms of iron (siderite, iron filings) to support delayed activation of injected oxidants to allow transport of ISCO reagents into contaminated groundwater systems. https://www.serdp-estcp.org/content/download/48532/461633/file/ER-2302%20Final%20Report.pdf



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