Measurement of PCDD/F congener distributions in MWI stack gas and ambient air in northern Taiwan

Moo Been Chang, Kai Hsien Chi, Shu Hao Chang, Yuan Wu Chen

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

To meet the emission standards that become more and more stringent, the waste incinerators are commonly equipped with various air pollution control devices. Gas/particulate phase distribution of polychlorinated dibenzo-p-doxin and furan (PCDD/F) in stack gas could be much different when different control technologies are applied. This study evaluates PCDD/F congener distributions at the stack gas of a municipal waste incinerator (MWI) and ambient air in northern Taiwan via stack gas and ambient air sampling and analysis. Ambient air samples were taken in the vicinity area of a large-scale MWI for measuring PCDD/F concentrations and partitioning gas/particulate phase from November 1999 through January 2001. Stack gas samples of the MWI were taken during the period of ambient air sampling. The PCDD/F concentrations measured in fall and winter seasons are significantly higher than those measured in summertime. In addition, the results obtained on gas/particulate partitioning of ambient air samples indicate that the particulate-phase PCDD/Fs account for more than 80% of the total concentration. Nevertheless, the gas/particulate partitioning of stack gas PCDD/F sample was completely different from that of the ambient air samples. The gas-phase PCDD/Fs account for more than 85% of the total concentration in MWI stack gas. This study also indicates that as the chlorination level of PCDD/F congeners increases, the percentage of PCDD/Fs existing in gas phase decreases in either ambient air or stack gas of MWI. Furthermore, the temperature in ambient air also affects the percentage of particle-bound dioxins. As the ambient air temperature decreases by 10°C, the percentage of PCDD/Fs in particulate phase increases around 20%. PCDFs account for about 80% of the I-TEQ concentrations for stack gas and ambient air sample, among them the 2,3,4,7,8-PeCDF is the major contributor, accounting for 30-55% of the total I-TEQ.

Original languageEnglish
Pages (from-to)2535-2544
Number of pages10
JournalAtmospheric Environment
Volume38
Issue number16
DOIs
StatePublished - May 2004

Keywords

  • Atmosphere
  • Dioxin
  • Gas/particle phase
  • Incinerator
  • Sampling

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