Removal of trichloroethylene in reduced soil columns

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A continuous soil column experiment was conducted to investigate reductive dechlorination of trichloroethylene (TCE) in soil system reductively manipulated by three types of reductants (Fe(II), dithionite, and Fe(II) + dithionite (combined treatment of Fe(II) and dithionite)). The soil column reduced by Fe(II) + dithionite has the greatest bed volumes (51.8) treated to breakthrough indicating that the combined treatment of Fe(II) and dithionite is more effective for the reductive dechlorination of TCE in the reduced soil column than the separate treatment of Fe(II) or dithionite. The measured bed volumes to breakthrough in control and treated soil columns were similar to the estimated bed volumes based on the result of batch kinetic experiment, differing by a factor of 0.96-1.02. The relative concentration of bromide (nonreactive tracer) reached the approximate value of 1 between 0.87 and 1.03 bed volume. C(2) hydrocarbons (acetylene, ethylene, and ethane) were observed as transformation products in the effluents of soil columns treated by the reductants. However, no chlorinated intermediates were observed at the concentrations above detection limits throughout the experiment. Chloride was observed in the effluents of soil columns reduced by dithionite and Fe(II) + dithionite. (C) 2004 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2004-09
Language
English
Article Type
Article
Keywords

HENRYS LAW CONSTANTS; REDUCTIVE DECHLORINATION; CHLORINATED ETHYLENES; MINERALS

Citation

JOURNAL OF HAZARDOUS MATERIALS, v.113, no.1-3, pp.177 - 182

ISSN
0304-3894
DOI
10.1016/j.jhazmat.2004.06.027
URI
http://hdl.handle.net/10203/7254
Appears in Collection
CE-Journal Papers(저널논문)
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