In Situ Gaseous Reduction Pilot Demonstration - Final Report

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The demonstration of the IGRS approach conducted at SWMU 143 on the White Sands Missile Range has provided information needed to complete a technical performance assessment and cost analysis of the technology. At least 70% of the Cr(VI) present in contaminated sediment at the site was reduced, thus verifying the effectiveness of the approach. Most of the treatment occurred in a zone located from {approximately}4 to 10 ft below ground surface, which appears to be a higher permeability interval. A deeper zone from {approximately}10 to 16 ft that contains lower levels of contamination was essentially unaffected. The deeper zone is ... continued below

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Medium: P; Size: 95 pages

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Thornton, E. C.; Phelan, J. M.; Giblin, J. T.; Olsen, K. B.; Miller, R. D. & Gilmore, T. J. February 23, 1999.

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Description

The demonstration of the IGRS approach conducted at SWMU 143 on the White Sands Missile Range has provided information needed to complete a technical performance assessment and cost analysis of the technology. At least 70% of the Cr(VI) present in contaminated sediment at the site was reduced, thus verifying the effectiveness of the approach. Most of the treatment occurred in a zone located from {approximately}4 to 10 ft below ground surface, which appears to be a higher permeability interval. A deeper zone from {approximately}10 to 16 ft that contains lower levels of contamination was essentially unaffected. The deeper zone is somewhat finer grained and has a higher clay content and is, thus, less permeable. It appears that most of the treatment gas was channeled through the higher, more-permeable zone and the lower zone was bypassed. Treatment of the lower zone could probably be accomplished, however, if a second injection well were installed and screened across the zone so that treatment gas could be forced into this interval. The amount of H{sub 2}S consumed during the test exceeded the amount predicted by the laboratory treatability study. In addition, the levels of H{sub 2}S observed at the extraction wells were relatively low, even though a significant level of treatment was observed at the site. It is inferred that interfering reactions or slower reaction kinetics are the likely source of consumption of extra H{sub 2}S observed in the field. Future laboratory work will be undertaken to investigate the nature of these chemical reactions and the reaction rates associated with the gaseous reduction of Cr(VI) in soils. Elucidation of these effects may reveal methods for improving the effectiveness of the technology and reducing unit costs. A life-cycle cost model was developed for the technology based on demonstration information (Hogan 1998). This model suggests that the technology should compare favorably with excavation from a cost basis for larger sites, especially when depths exceed 15 or 20 ft. Site-specific information should be provided as input to the model to evaluate this, however, because costs vary significantly, depending on site characteristics. The IGRS approach is considered ready for application as a remediation tool based on the success of the field demonstration at the White Sands Missile Range. It is expected that a large-scale test or deployment will take place at a US Department of Energy CrO{sub 4}{sup 2{minus}} contaminated site within the next several years. In addition, further laboratory-testing activities are planned to identify other metal and radionuclide contaminants that can be immobilized through the gaseous reduction approach.

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Medium: P; Size: 95 pages

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INIS; OSTI as DE00003762

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  • Other Information: PBD: 23 Feb 1999

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  • Report No.: PNNL-12121
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/3762 | External Link
  • Office of Scientific & Technical Information Report Number: 3762
  • Archival Resource Key: ark:/67531/metadc675645

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  • February 23, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 7, 2016, 12:51 p.m.

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Thornton, E. C.; Phelan, J. M.; Giblin, J. T.; Olsen, K. B.; Miller, R. D. & Gilmore, T. J. In Situ Gaseous Reduction Pilot Demonstration - Final Report, report, February 23, 1999; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc675645/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.