In-situ subsurface extraction and decontamination
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United States of America Patent
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Apr 11, 2017
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N/A
app pub date -
Jun 2, 2015
filing date -
Jun 2, 2014
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Abstract
A method of decontaminating ground media. The method includes drilling an injection hole into ground media to a depth at or below where contaminants are also present, drilling one or more extraction holes into the ground media in close proximity to the injection hole, injecting a reagent into the injection hole, treating the ground media for a time sufficient to have a chelating agent chelate a metal present in the ground media, reacting the chelated metal with a peroxide to produce hydroxide ions, contacting the reagent with the ground media to decrease its permeability, contacting contaminants in the ground media with the hydroxide ions to convert the contaminants to environmentally safe compounds, increasing the pressure of the reagent into the ground media, further reducing the permeability of the ground media to release trapped contaminants, and transferring contaminants from the ground media to above a surface of the ground media.
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