Shaw Environmental and Infrastructure, Inc.

Biological Treatment of Hexavalent Chromium Treatability Study Report

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Courtesy of Shaw Environmental and Infrastructure, Inc.

A former XXXX was found to be impacted by hexavalent chromium [Cr(VI)]. The site Cr(VI) plume has groundwater concentrations as high as 1,150,000 μg/L in the hot spot(s). Treatability studies were conducted at Shaw Environmental & Infrastructure, Inc.’s Technology Development Laboratory (TDL) in Knoxville, Tennessee, to evaluate treatment technologies to decrease the concentration of Cr(VI) in the groundwater. Chemical treatment was evaluated for high Cr(VI) concentrations from the hot spot(s), while biological treatment was tested on relatively low Cr(VI) concentration soil and groundwater due to potential toxic effects to the microbes from elevated Cr(VI) levels. This report presents the results and discussion of the biological treatment. The chemical treatment results were presented in a separate treatability report; “Chemical Treatment of Hexavalent Chromium Treatability Study Report for the Former XXXX Engineering Facility, ” dated October 12, 2006.

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