PMID: 15382875Sep 24, 2004Paper

Hindered gas-phase partitioning of trichloroethylene from aqueous cyclodextrin systems: implications for treatment and analysis

Environmental Science & Technology
N Kashiyama, T B Boving

Abstract

Chemically enhanced flushing has shown great promise for attenuating subsurface nonaqueous phase liquid (NAPL) contamination. One particular chemically enhanced remediation technology is cyclodextrin enhanced flushing (CDEF). CDEF has been demonstrated as a viable alternative to conventional and innovative remediation methods. However, the presence of cyclodextrin (CD) in solution complicates the treatment and analysis of volatile organic compounds, such as trichloroethylene (TCE). The principal reason for the complications is the presence of TCE in three compartments instead of two, i.e., the aqueous solution, the vapor phase, and complexed inside the soluble CD molecule. Aqueous TCE-CD systems were examined at various concentration and temperature conditions and their respective Henry's law constants were measured. The presence of CD significantly decreased Henry's law constant of TCE. On the basis of these results, a quantitative model was developed to predict the additional effort that becomes necessary when air-stripping TCE from CDEF flushing solution. The modeling results demonstrate that the presence of CD requires significantly higher gas flow rates or longer residence times of the flushing solution inside an air strip...Continue Reading

Citations

Jun 16, 2012·Journal of Environmental Monitoring : JEM·Heng GaoEdward B Overton
Oct 9, 2012·Journal of Environmental Monitoring : JEM·William J Blanford, Heng Gao
Sep 4, 2007·Chemosphere·Philippe BlachGheorghe Surpateanu
Jul 28, 2012·Ground Water·Heng GaoAifang Gao
Aug 1, 2006·Journal of Hazardous Materials·Jung-Seok YangJi-Won Yang
May 30, 2009·Environmental Science & Technology·Heng GaoJustin E Birdwell

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