Treatment of polychlorinated dibenzo-p-dioxins and dibenzofurans contaminated soil using S2O8 2− with ferrous ion and heat as activating methods

Yonghyeon Lee, Mingcan Cui, Jongbok Choi, Jeonggwan Kim, Jeehyeong Khim

Research output: Contribution to journalArticle

Abstract

The uses of Fe2+ and thermal energy as S2O8 2− activating methods for the treatment of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) contaminated soil using S2O8 2− were simultaneously studied for the first time. PCDD/Fs degradation was conducted using S2O8 2− with and without the Fe2+ addition at 25 °C, 40 °C, and 60 °C, and the process of S2O8 2− without Fe2+ showed the best performance, 99.0% removal efficiency of 17 PCDD/Fs in 72 h. The SO4 [rad]− based process is effective for the degradation of PCDD/Fs. The presence of Fe2+ greatly influenced the soil pH development during the process, but the pH change showed an insignificant effect on PCDD/Fs degradation by the SO4 [rad]− based process. The performances of several options implied that the direct interactions of Fe2+, heat, and S2O8 2− on PCDD/Fs are very few, and interestingly, the combination of Fe2+ and thermal energy did not always show a clear advantage over the individual use of Fe2+ or thermal energy. The behaviours of PCDD/Fs in S2O8 2− based process is consistent regardless of an activating method. The lower-chlorinated PCDD/Fs were easier to be degraded than higher ones, and in most cases, more PCDFs were degraded than PCDDs in the case of same chlorine numbers.

Original languageEnglish
Article number123299
JournalChemical Engineering Journal
Volume384
DOIs
Publication statusPublished - 2020 Mar 15

Keywords

  • Dioxins (PCDD/Fs)
  • Fe-activated SO
  • Fe-thermal energy combined activation
  • Soil contamination
  • Thermally activated SO

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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