Effect of contaminant diffusion into and out of low-permeability zones

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We considered the case of an aquifer in the form of a network of high-permeability (HK) channels imbedded in a very low-permeability (LK) porous medium. Contaminants in the aquifer were adsorbed on the solid matrix in both the LK and HK materials. Contaminants were also diffused into and adsorbed onto the LK material. We also investigated the penetration of a contaminant into the LK material and its subsequent release into the aquifer material during cleanup by pump-and-treat operations. The model results indicate that the diffusive flux of contaminant into and within the LK zone may significantly reduce the rate of … continued below

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30 p.

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Bear, J.; Nichols, E.; Kulshrestha, A. & Ziagos, J. February 1, 1994.

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We considered the case of an aquifer in the form of a network of high-permeability (HK) channels imbedded in a very low-permeability (LK) porous medium. Contaminants in the aquifer were adsorbed on the solid matrix in both the LK and HK materials. Contaminants were also diffused into and adsorbed onto the LK material. We also investigated the penetration of a contaminant into the LK material and its subsequent release into the aquifer material during cleanup by pump-and-treat operations. The model results indicate that the diffusive flux of contaminant into and within the LK zone may significantly reduce the rate of contaminant removal, and, therefore, the progress of remedial actions. We found that the use of a constant transfer coefficient to describe the rate of exchange of contaminant between the two materials was inappropriate for simulating cleanup to low concentrations. Instead, a different method for approximating the effect of diffusive flux into and out of an LK zone was proposed and demonstrated on zero- and one-dimensional models of contaminant transport. The technique was applied to Lawrence Livermore National Laboratory`s environmental restoration. The diffusive exchange resulted in a lower concentration of contaminant in the HK material during the initial contamination phase, and a slower rate of concentration decrease during the cleanup phase. The concentrations in the LK material may remain above cleanup goals for prolonged periods.

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30 p.

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OSTI as DE94009036; Paper copy available at OSTI: phone, 865-576-8401, or email, reports@adonis.osti.gov

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  • Other Information: PBD: Feb 1994

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  • February 1, 1994

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  • Nov. 3, 2018, 11:47 a.m.

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  • Nov. 12, 2018, 7:14 p.m.

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Bear, J.; Nichols, E.; Kulshrestha, A. & Ziagos, J. Effect of contaminant diffusion into and out of low-permeability zones, report, February 1, 1994; California. (https://digital.library.unt.edu/ark:/67531/metadc1311808/: accessed July 27, 2021), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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