TY - JOUR
T1 - Effect of temperature on the reductive dechlorination of 1,2,3,4-tetrachlorodibenzofuran in anaerobic PCDD/F-contaminated sediments
AU - Kuokka, S.
AU - Rantalainen, A. L.
AU - Romantschuk, M.
AU - Häggblom, M. M.
N1 - Funding Information:
This work was supported by the Maj and Tor Nessling Foundation and Maa- ja vesitekniikan tuki . Matti Verta, Simo Salo, and Markku Korhonen from the Finnish Environmental Institute (SYKE) are acknowledged for performing the sediment sampling and Kaisa Soikkeli for assisting with molecular analysis.
PY - 2014/6/15
Y1 - 2014/6/15
N2 - 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. °C, 3.9 y at 15. °C, and 19.0 y at 4. °C. Co-amendment with 2,3,4,6-TeCP reduced the TeCDF half-life to 1.8 y at 21. °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.
AB - 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. °C, 3.9 y at 15. °C, and 19.0 y at 4. °C. Co-amendment with 2,3,4,6-TeCP reduced the TeCDF half-life to 1.8 y at 21. °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.
KW - PCDD/F
KW - Reductive dechlorination
KW - Sediment
KW - Temperature
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U2 - 10.1016/j.jhazmat.2014.03.065
DO - 10.1016/j.jhazmat.2014.03.065
M3 - Article
C2 - 24768962
AN - SCOPUS:84899080985
VL - 274
SP - 72
EP - 78
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
SN - 0304-3894
ER -