Abiotic reductive dechlorination of chlorinated ethylenes by soil

Abiotic reductive dechlorination of chlorinated ethylenes by soil in anaerobic environments was characterized to improve knowledge of the behavior of chlorinated ethylenes in natural systems, including systems modified to promote attenuation of contaminants. Target organics in the soil suspension reached sorption equilibrium in 2 days and the sorption isotherm of target organics was properly described by the linear sorption model. A modified Langmuir-Hinshelwood model was developed to describe the kinetics of reductive dechlorination of target organics by soil. The rate constants for the reductive dechlorination of chlorinated ethylenes at the reactive surfaces of reduced soils were found in the range between 0.055 (+/-8.9%) and 2.60 (+/-3.2%) day(-1). The main transformation products in reduced soil suspensions were C-2 hydrocarbons. No chlorinated intermediates were observed at concentrations above detection limits. Five cycles of reduction of the soil followed by oxidation of the soil with trichloroethylene (TCE) did not affect the removal of TCE. The removal was affected by the reductants used and increased in the order: Fe(II) < dithionite < Fe(II) + dithionite. (C) 2003 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2004-05
Language
ENG
Keywords

HENRYS LAW CONSTANTS; CARBON-TETRACHLORIDE; TRICHLOROETHYLENE; TRANSFORMATION; TETRACHLOROETHYLENE; DEHALOGENATION; HYDROCARBONS; SORPTION; SYSTEMS; SEDIMENTS

Citation

CHEMOSPHERE, v.55, no.5, pp.705 - 713

ISSN
0045-6535
DOI
10.1016/j.chemosphere.2003.11.033
URI
http://hdl.handle.net/10203/7250
Appears in Collection
CE-Journal Papers(저널논문)
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