Volume 33, Issue 6 (November 2010)

    A Consolidation and Contaminant Transport Device for Assessing Reactive Mat Effectiveness for Subaqueous Sediment Remediation

    (Received 17 November 2009; accepted 21 June 2010)

    Published Online: 2010

    CODEN: GTJOAD

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    Abstract

    This paper describes the design and fabrication of a new laboratory testing column to assess the effectiveness of a permeable reactive mat for in situ sediment remediation. After the composite mat, which consists of top and bottom filtering geotextile layers and a middle reactive core, is placed on the sediment surface, hydrodynamic dispersion and pore fluid flow carry contaminants through the mat. In the reactive layer, the contaminants react with one or more amendments. A thin cap of new sediment material can be placed on top of the geocomposite to promote a new, healthy benthic community. The processes controlling these geocomposites have not been physically modeled to assess their effectiveness. The new device is fundamentally a sediment column, but with the capability to apply a constant, overlying stress to the sediment-reactive mat column to cause its consolidation. Pressure-volume controllers at the top and bottom of the sediment column allow in situ pressure conditions to be imposed and allow for chemical sampling of inflow/outflow fluids.


    Author Information:

    Meric, Dogus
    Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Northeastern Univ., Boston, MA

    Sheahan, Thomas C.
    Professor, Dept. of Civil and Environmental Engineering, Northeastern Univ., Boston, MA

    Alshawabkeh, Akram
    Professor, Dept. of Civil and Environmental Engineering, Northeastern Univ., Boston, MA

    Shine, James
    Senior Lecturer on Aquatic Chemistry, Dept. of Environmental Health, Harvard School of Public Health, Boston, MA


    Stock #: GTJ102880

    ISSN: 0149-6115

    DOI: 10.1520/GTJ102880

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    Author
    Title A Consolidation and Contaminant Transport Device for Assessing Reactive Mat Effectiveness for Subaqueous Sediment Remediation
    Symposium , 0000-00-00
    Committee D18