Sorption and permeability of gasoline hydrocarbons in organobentonite porous media
DOI: 10.1016/S0304-3894(02)00199-1
Title: Sorption and permeability of gasoline hydrocarbons in organobentonite porous media
Journal Title: Journal of Hazardous Materials
Volume: 96
Issue: 1
Publication Date: 3 January 2003
Start Page: 91
End Page: 97
Published online: online 28 August 2002
ISSN: 0304-3894
Affiliations:
  • Program of Interdisciplinary Research in Contaminant Hydrogeology (PIRCH), Department of Civil Engineering, University of Virginia, P.O. Box 400742, Charlottesville, VA 22904-4742, USA
  • Abstract: tigate the use of organobentonites as liners for underground gasoline storage tanks to reduce the risk of subsurface contamination. A series of permeability measurements were conducted on two types of organobentonites: benzyltriethylammonium-bentonite (BTEA-bentonite) and hexadecyltrimethylammonium-bentonite (HDTMA-bentonite). Both water and commercial unleaded gasoline were used as the permeant liquids. Results of these measurements indicate that the intrinsic permeability of the organobentonite decreases by one to two orders of magnitude when the permeant liquid is changed from water to gasoline. Results of batch sorption measurements reveal that benzene sorption to both organobentonites from water is greater than benzene sorption to conventional bentonite. The magnitude of benzene sorption is related to the loading of the organic quaternary ammonium cation on the clay. As the HDTMA cation loading increases from 25% of cation exchange capacity (CEC) to 120% of CEC, benzene sorption increases. However, as the BTEA cation loading increases from 40 to 120% of CEC, benzene sorption decreases. Collectively, these results suggest that organobentonites can be used effectively to reduce hydrocarbon migration rates beneath leaking underground gasoline storage tanks, and that the optimal organic cation loading with respect to pollutant sorption may be less than 50% of cation exchange capacity for some organobentonite–solute combinations.
    Accepted: 10 July 2002
    Received: 29 January 2002
    Revised: 3 June 2002
    Tel: +1-434-924-7991
    Fax: +1-434-924-2951
    Email: jsmith@virginia.edu

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