Evaluation of PCDD/F partitioning between vapor and solid phases in MWI flue gases with temperature variation

Kai Hsien Chi, Moo Been Chang, Shu Hao Chang

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13 Scopus citations

Abstract

Partitioning of PCDD/Fs (polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofuran) between vapor and solid phases in flue gas is affected by several factors including temperature variation. In this study, PCDD/F removal efficiencies achieved with activated carbon injection (ACI) and partitioning of vapor/solid phase PCDD/Fs in flue gases with temperature variation in a municipal waste incinerator (MWI) are evaluated via intensive flue gas sampling. Results indicate that most PCDD/Fs in flue gas downstream of the ACI + bag filter (BF) exist in vapor phase (over 90%) while the removal efficiencies of vapor and solid phase PCDD/Fs are 98.5-99.6% and 99.8-99.9%, respectively. The results of flue gas samplings also indicate that there is optimal operating temperature for PCDD/F removal achieved with ACI. Additionally, a pilot-scale adsorption system (PAS) is constructed in this study to evaluate the PCDD/F partitioning affected by temperature. The results of the PAS experimentation indicate that about 55% and 25% vapor phase PCDD/Fs passing through the filter cake (adsorbent) are transferred to solid phase at 150 and 200 °C, respectively. As the temperature is increased to 250 °C, filter cake (adsorbent) cannot effectively adsorb vapor phase PCDD/Fs and significant PCDD/Fs are formed via de novo synthesis.

Original languageEnglish
Pages (from-to)620-627
Number of pages8
JournalJournal of Hazardous Materials
Volume138
Issue number3
DOIs
StatePublished - 1 Dec 2006

Keywords

  • Activated carbon
  • Dioxin
  • Municipal wastes incinerator
  • Stack sampling
  • Vapor pressure

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