Logo for the University of Illinois at Chicago
    • Login
    View Item 
    •   INDIGO Home
    • Engineering, College of
    • Civil and Materials Engineering, Department of
    • Publications - Civil and Materials Engineering
    • View Item
    •   INDIGO Home
    • Engineering, College of
    • Civil and Materials Engineering, Department of
    • Publications - Civil and Materials Engineering
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Remediation of Chlorinated Solvent Plumes Using In-Situ Air Sparging-A 2-D Laboratory Study

    Thumbnail
    View/Open
    ijerph-08-02226.pdf (241.6Kb)
    Date
    2011-06-16
    Author
    Adams, Jeffrey A.
    Reddy, Krishna R.
    Tekola, Lue
    Publisher
    MDPI
    Metadata
    Show full item record
    Abstract
    In-situ air sparging has evolved as an innovative technique for soil and groundwater remediation impacted with volatile organic compounds (VOCs), including chlorinated solvents. These may exist as non-aqueous phase liquid (NAPL) or dissolved in groundwater. This study assessed: (1) how air injection rate affects the mass removal of dissolved phase contamination, (2) the effect of induced groundwater flow on mass removal and air distribution during air injection, and (3) the effect of initial contaminant concentration on mass removal. Dissolved-phase chlorinated solvents can be effectively removed through the use of air sparging; however, rapid initial rates of contaminant removal are followed by a protracted period of lower removal rates, or a tailing effect. As the air flow rate increases, the rate of contaminant removal also increases, especially during the initial stages of air injection. Increased air injection rates will increase the density of air channel formation, resulting in a larger interfacial mass transfer area through which the dissolved contaminant can partition into the vapor phase. In cases of groundwater flow, increased rates of air injection lessened observed downward contaminant migration effect. The air channel network and increased air saturation reduced relative hydraulic conductivity, resulting in reduced groundwater flow and subsequent downgradient contaminant migration. Finally, when a higher initial TCE concentration was present, a slightly higher mass removal rate was observed due to higher volatilization-induced concentration gradients and subsequent diffusive flux. Once concentrations are reduced, a similar tailing effect occurs.
    Subject
    air sparging
    contamination
    Type
    Article
    Date available in INDIGO
    2012-08-17T19:38:50Z
    URI
    http://hdl.handle.net/10027/8539
    Collections
    • Publications - Civil and Materials Engineering

    DSpace software copyright © 2002-2015  DuraSpace
    Contact Us | Send Feedback | Privacy Statement
    Theme by 
    Atmire NV

    Browse

    All of INDIGOCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    DSpace software copyright © 2002-2015  DuraSpace
    Contact Us | Send Feedback | Privacy Statement
    Theme by 
    Atmire NV