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J Environ Manage

Title:		Removal of trichloroethylene from soil using the hydration of calcium oxide
Author(s):		Ko JH; Musson S; Townsend T;
Address:		"Department of Environmental Engineering Sciences, University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA. jaehacko@ufl.edu"
Journal Title:		J Environ Manage
Year:		2011
Volume:		20110316
Issue:		7
Page Number:		1767 - 1773
DOI:		10.1016/j.jenvman.2011.02.004
ISSN/ISBN:		1095-8630 (Electronic) 0301-4797 (Linking)
Abstract:		"Quicklime addition to soil at a remediation site was observed to sufficiently reduce TCE levels, but the cause of the removal could not be confirmed with the field data collected. Potential mechanisms for CaO treatment of trichloroethylene (TCE) in soil include degradation and volatilization. Since earlier studies found TCE degradation to occur during the hydration of CaO under conditions where volatilization was limited, research was conducted on mechanisms of TCE removal from soil by CaO application under conditions where volatilization was allowed to occur. TCE volatilization in soil treated with 0%, 5%, 10%, and 20% CaO doses was measured in experiments where the degree of volatilization could be tracked. The total TCE removal from soil spiked with TCE at CaO doses from 5% to 20% ranged from 97% to 99% of the initial TCE mass. Volatilization accounted for 64.4-92.5% of the TCE removal, with unrecovered TCE and TCE degradation accounting for the remaining fraction. The greater heat encountered with higher CaO doses helped minimize obstacles to TCE volatilization, such as high soil organic and clay content. Treatment with a 20% CaO dose, however, led to the formation of byproducts such as dichloroacetylene. TCE degradation to dichloroacetylene at the 20% CaO dose ranged from 2.7% to 6.4% of the initial TCE. Volatilization was concluded to be the dominant process for TCE removal from soil during CaO treatment"
Keywords:		"Calcium Compounds/*chemistry Chromatography, Gas Environmental Restoration and Remediation/*methods Oxides/*chemistry Soil Pollutants/*isolation & purification Temperature Trichloroethylene/*isolation & purification Volatilization;"
Notes:		"MedlineKo, Jae Hac Musson, Steve Townsend, Timothy eng Research Support, Non-U.S. Gov't England 2011/03/19 J Environ Manage. 2011 Jul; 92(7):1767-73. doi: 10.1016/j.jenvman.2011.02.004. Epub 2011 Mar 16"