Effect of temperature on the reductive dechlorination of 1,2,3,4-tetrachlorodibenzofuran in anaerobic PCDD/F-contaminated sediments

S. Kuokka, A. L. Rantalainen, M. Romantschuk, M. M. Häggblom

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)72-78
Number of pages7
JournalJournal of Hazardous Materials
Volume274
DOIs
StatePublished - Jun 15 2014

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Keywords

  • PCDD/F
  • Reductive dechlorination
  • Sediment
  • Temperature

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