Evaluation of the potential for the natural attenuation of hexavalent chromium within a sub-wetland ground water |
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Authors: | Hellerich Lucas A Nikolaidis Nikolaos P Dobbs Gregory M |
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Affiliation: | aEnvironmental Engineering Program, University of Connecticut, Storrs, CT 06269-2037, USA;bMetcalf & Eddy, 860 North Main Street Extension, Wallingford, CT 06492, USA;cDepartment of Environmental Engineering Technical University of Crete, Polytechnioupolis, 73100 Chania, Crete, Greece;dUnited Technologies Research Center, Mail Stop 129-30, 411 Silver Lane, East Hartford, CT 06108, USA |
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Abstract: | In this work, the potential for natural attenuation (NA) of Cr(VI) is evaluated for sub-wetland ground water at a chromium-contaminated site in Connecticut, incorporating the experimental findings of previous work at the site. Experimental data is assessed through long-term attenuation capacity calculations and modeling, which incorporates statistical uncertainty of parametric values. The NA evaluation yielded the following results: (1) Significant increases in Cr(VI) concentration and extremely long chromium source dissolution timeframes are required to exceed the attenuation capacity of the sub-wetland region soils studied in this work; and (2) Based on the 1-D transport modeling and incorporating input parameter uncertainty, there is an approximately 92% and 98% probability that the applicable regulatory criteria will not be exceeded at Point C, near a river which serves as the receptor, for the cases of (1) sorption of Cr(VI) only and (2) pseudo first order disappearance of Cr(VI) from the aqueous phase only, respectively. |
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Keywords: | Hexavalent chromium Ground water Natural attenuation Remediation Wetland |
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