Dechlorination and destruction of PCDDs/PCDFs in fly ashes from municipal solid waste incinerators by low temperature thermal treatment

Geum Ju Song, Seong Heon Kim, Yongchil Seo, Sam Cwan Kim

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Dechlorination and destruction characteristics of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDDs/PCDFs) in fly ashes from commercial-scale municipal solid waste incinerators by low temperature thermal treatment using a laboratory-scale heating system were investigated. Experiments were carried out in reducing atmosphere at temperatures of 300 °C, 450 °C and 600 °C respectively, for the treatment time of 1 h and 3 h. Concentrations of PCDDs/PCDFs in raw fly ashes ranged from 35.5 to 107.3 μg kg-1 (1.5-3.4 μg TEQ kg-1) and treated fly ashes ranged from 0.34 to 45.3 μg kg-1 (0.012-1.63 μg TEQ kg-1). Concentrations of PCDDs/PCDFs in fly ashes treated at the different temperatures and times were observed to decrease with increase of treatment temperature and time by dechlorination or destruction. The distribution of octa- and hepta-chlorinated congeners were decreased and tetra-, penta- and hexa-chlorinated congeners were increased at 300 °C and 450 °C, but the distribution of octa- and hepta-chlorinated congeners were increased and tetra-, penta- and hexa-chlorinated congeners were again decreased at 600 °C. Total destruction efficiencies of PCDDs/PCDFs in fly ashes showed above 95% at the treatment temperature of 450 °C for 3 h. However, removal efficiency of each congener in fly ashes varied, especially, 2,3,7,8-TeCDD and 1,2,3,7,8-PeCDD in fly ash A increased. And the dechlorination and destruction characteristics of PCDDs/PCDFs in fly ash A and B was different due to difference in contents of Ca-compounds and metal oxides such as CuO and PbO in fly ashes.

Original languageEnglish
Pages (from-to)248-257
Number of pages10
JournalChemosphere
Volume71
Issue number2
DOIs
Publication statusPublished - 2008 Mar 1

Fingerprint

Coal Ash
Solid Waste
Dechlorination
Refuse incinerators
Municipal solid waste
PCDF
dechlorination
Fly ash
municipal solid waste
fly ash
dioxin
Hot Temperature
Heat treatment
Temperature
Rubiaceae
temperature
dibenzo(1,4)dioxin
thermal treatment
waste incinerator
Polychlorinated Dibenzofurans

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

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title = "Dechlorination and destruction of PCDDs/PCDFs in fly ashes from municipal solid waste incinerators by low temperature thermal treatment",
abstract = "Dechlorination and destruction characteristics of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDDs/PCDFs) in fly ashes from commercial-scale municipal solid waste incinerators by low temperature thermal treatment using a laboratory-scale heating system were investigated. Experiments were carried out in reducing atmosphere at temperatures of 300 °C, 450 °C and 600 °C respectively, for the treatment time of 1 h and 3 h. Concentrations of PCDDs/PCDFs in raw fly ashes ranged from 35.5 to 107.3 μg kg-1 (1.5-3.4 μg TEQ kg-1) and treated fly ashes ranged from 0.34 to 45.3 μg kg-1 (0.012-1.63 μg TEQ kg-1). Concentrations of PCDDs/PCDFs in fly ashes treated at the different temperatures and times were observed to decrease with increase of treatment temperature and time by dechlorination or destruction. The distribution of octa- and hepta-chlorinated congeners were decreased and tetra-, penta- and hexa-chlorinated congeners were increased at 300 °C and 450 °C, but the distribution of octa- and hepta-chlorinated congeners were increased and tetra-, penta- and hexa-chlorinated congeners were again decreased at 600 °C. Total destruction efficiencies of PCDDs/PCDFs in fly ashes showed above 95{\%} at the treatment temperature of 450 °C for 3 h. However, removal efficiency of each congener in fly ashes varied, especially, 2,3,7,8-TeCDD and 1,2,3,7,8-PeCDD in fly ash A increased. And the dechlorination and destruction characteristics of PCDDs/PCDFs in fly ash A and B was different due to difference in contents of Ca-compounds and metal oxides such as CuO and PbO in fly ashes.",
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Dechlorination and destruction of PCDDs/PCDFs in fly ashes from municipal solid waste incinerators by low temperature thermal treatment. / Song, Geum Ju; Kim, Seong Heon; Seo, Yongchil; Kim, Sam Cwan.

In: Chemosphere, Vol. 71, No. 2, 01.03.2008, p. 248-257.

Research output: Contribution to journalArticle

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AB - Dechlorination and destruction characteristics of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDDs/PCDFs) in fly ashes from commercial-scale municipal solid waste incinerators by low temperature thermal treatment using a laboratory-scale heating system were investigated. Experiments were carried out in reducing atmosphere at temperatures of 300 °C, 450 °C and 600 °C respectively, for the treatment time of 1 h and 3 h. Concentrations of PCDDs/PCDFs in raw fly ashes ranged from 35.5 to 107.3 μg kg-1 (1.5-3.4 μg TEQ kg-1) and treated fly ashes ranged from 0.34 to 45.3 μg kg-1 (0.012-1.63 μg TEQ kg-1). Concentrations of PCDDs/PCDFs in fly ashes treated at the different temperatures and times were observed to decrease with increase of treatment temperature and time by dechlorination or destruction. The distribution of octa- and hepta-chlorinated congeners were decreased and tetra-, penta- and hexa-chlorinated congeners were increased at 300 °C and 450 °C, but the distribution of octa- and hepta-chlorinated congeners were increased and tetra-, penta- and hexa-chlorinated congeners were again decreased at 600 °C. Total destruction efficiencies of PCDDs/PCDFs in fly ashes showed above 95% at the treatment temperature of 450 °C for 3 h. However, removal efficiency of each congener in fly ashes varied, especially, 2,3,7,8-TeCDD and 1,2,3,7,8-PeCDD in fly ash A increased. And the dechlorination and destruction characteristics of PCDDs/PCDFs in fly ash A and B was different due to difference in contents of Ca-compounds and metal oxides such as CuO and PbO in fly ashes.

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