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Experimental studies of self-sustaining thermal aquifer remediation (STAR) for non-aqueous phase liquid (NAPL) sources

Switzer, Christine and Pironi, Paolo and Rein, Guillermo and Torero, Jose L. and Gerhard, Jason I. (2008) Experimental studies of self-sustaining thermal aquifer remediation (STAR) for non-aqueous phase liquid (NAPL) sources. In: ConSoil 2008, 2008-06-03 - 2008-06-06, Milan, Italy.

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    Abstract

    Self-sustaining Thermal Aquifer Remediation (STAR) is a novel technology that employs smouldering combustion for the remediation of subsurface contamination by non-aqueous phase liquids (NAPLs). Smouldering is a form of combustion that is slower and less energetic than flaming combustion. Familiar examples of smouldering involve solid fuels that are destroyed by the reaction (e.g., a smouldering cigarette or peat smouldering after a wildfire). In STAR, the NAPL serves as the fuel within an inert, porous soil medium. Results from experiments across a range of scales are very promising. Detailed characterisation has focused on coal tar, a common denser-than-water NAPL (DNAPL) contaminant. Complete remediation is demonstrated across this range of scales. Visual observations are supported by chemical extraction results. Further experiments suggest that STAR can be self-sustaining, meaning that once ignited the process can supply its own energy to propagate. Costly energy input is reduced significantly. Comparison of large scale to small scale laboratory experiments, a volume increase by a factor of 100, suggests that STAR process efficiency increases with scale. This increase in efficiency results from reduced heat losses at larger scales while maximum the temperature achieved by STAR is unaffected. The research also demonstrates the controllability of STAR, where the termination of airflow to the reaction terminates the STAR process. The scale-up process provides important guidance to the development of full scale STAR for ex situ remediation of NAPL-contaminated soil.

    Item type: Conference or Workshop Item (Paper)
    ID code: 13583
    Notes: The Proceedings (CD for oral and poster contributions and book of abstracts with summaries only for oral contributions) will be available at the conference (ISBN of Proceedings CD: 978-3-00-024598-5)
    Keywords: self-sustaining thermal aquifer remediation, non-aqueous phase liquid, NAPL, civil engineering, remediation, thermal aquifer, Environmental technology. Sanitary engineering, Engineering (General). Civil engineering (General)
    Subjects: Technology > Environmental technology. Sanitary engineering
    Technology > Engineering (General). Civil engineering (General)
    Department: Faculty of Engineering > Civil and Environmental Engineering
    Related URLs:
    Depositing user: Dr Christine Switzer
    Date Deposited: 03 Dec 2009 15:53
    Last modified: 06 Oct 2012 08:18
    URI: http://strathprints.strath.ac.uk/id/eprint/13583

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