Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 274, Issue -, Pages 72-78Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2014.03.065
Keywords
PCDD/F; Reductive dechlorination; Temperature; Sediment
Categories
Funding
- Maj and Tor Nessling Foundation
- Maa- ja vesitekniikan tuki
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The effect of temperature on the reductive dechlorination in sediments of the PCDD/F-contaminated Kymijoki River, Finland was assessed with 1,2,3,4-tetrachlorodibenzofuran (1,2,3,4-TeCDF) at various temperatures and with co-amendment of 2,3,4,6-tetrachlorophenol (2,3,4,6-TeCP) in laboratory microcosms. The dechlorination rate of 1,2,3,4-TeCDF increased with incubation temperature, with TeCDF half-lives of 2.1 y at 21 degrees C, 3.9 y at 15 degrees C, and 19.0 y at 4 degrees C. Co-amendment with 2,3,4,6-TeCP reduced the TeCDF half-life to 1.8 y at 21 degrees C. 1,2,3,4-TeCDF was dechlorinated mainly in the lateral position to 1,3,4-TrCDF and then to 1,3-DiCDF over 29 months, but incubation temperature affected the relative molar ratios of the dechlorination products. The abundance of the Dehalococcoides-like Chloroflexi community did not substantially change in microcosms over 24 months incubation at the different temperatures. The dechlorination activity of 1,2,3,4-TeCDF was significantly limited at lower temperatures, which should be considered in predicting the environmental fate of aged PCDD/Fs in sediments of the Kymijoki River. (C) 2014 Elsevier B.V. All rights reserved.
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