Characteristics of major dioxin/furan congeners in melted slag of ash from municipal solid waste incinerators

Ki Heon Kim, Yongchil Seo, Hoon Nam, Hyun Tae Joung, Jae Cheon You, Dong Jin Kim, Yong Chan Seo

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in slag of fly ash from three municipal solid waste (MSW) incinerators were analyzed to observe any changes in characteristics and distribution of their congeners by melting process. Actual concentration and Toxic Equivalent (TEQ) concentration profiles of 17 major congeners of PCDDs/PCDFs for gas, fly ash and melted slag were compared. The distributions of PCDDs/PCDFs in different streams macroscopically showed similarities with the generally known profiles for emission gas from a municipal waste incinerator. The total concentrations of PCDDs/PCDFs in off-gas and fly ash have been known to be a function of incineration conditions and of air pollution control device utilization; however, their normalized distributions were independent of such conditions. The concentrations of PCDDs/PCDFs in the melted slag of fly ash were not related to the concentrations of PCDDs/PCDFs congeners in fly ash but were rather a function of the melting furnace type and operation. The total amount of PCDDs/PCDFs in the melted slag of fly ash contained almost 150-27,000 times less dioxin than that in fly ash, however, the TEQ of dioxin in the slag was reduced by 435-43,500 times, which could enable them to be utilized as recycled construction materials. In normalized TEQ concentration profiles of 17 congeners of PCDDs/PCDFs, the ratio of PCDFs to PCDDs changed from 1.32 to 2.19 by melting, which showed relatively higher portion of furans left in melted slag than those in fly ash. By comparing reduction ratios of different congeners, PCDDs (dioxins) were relatively easier to destruct than PCDFs (furans) during melting process. The most difficult congener to destruct could be octa-chlorinated dibenzofuran (OCDF) among major congeners. For slag cooling methods, dioxin concentration in TEQ of slow cooled slag by air was four times higher than that of fast cooled slag by water. Thus cooling by water is more appropriate with the added beneficial effect of producing granules/particles, which can be utilized as roadbed materials.

Original languageEnglish
Pages (from-to)171-181
Number of pages11
JournalMicrochemical Journal
Volume80
Issue number2
DOIs
Publication statusPublished - 2005 Jan 1

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Ashes
Dioxins
Refuse incinerators
Municipal solid waste
Coal Ash
Slags
Poisons
Furans
Melting
Gases
furan
dibenzo(1,4)dioxin
Cooling
Melting furnaces
Air pollution control
Incineration
Water

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Spectroscopy

Cite this

Kim, Ki Heon ; Seo, Yongchil ; Nam, Hoon ; Joung, Hyun Tae ; You, Jae Cheon ; Kim, Dong Jin ; Seo, Yong Chan. / Characteristics of major dioxin/furan congeners in melted slag of ash from municipal solid waste incinerators. In: Microchemical Journal. 2005 ; Vol. 80, No. 2. pp. 171-181.
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Characteristics of major dioxin/furan congeners in melted slag of ash from municipal solid waste incinerators. / Kim, Ki Heon; Seo, Yongchil; Nam, Hoon; Joung, Hyun Tae; You, Jae Cheon; Kim, Dong Jin; Seo, Yong Chan.

In: Microchemical Journal, Vol. 80, No. 2, 01.01.2005, p. 171-181.

Research output: Contribution to journalArticle

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T1 - Characteristics of major dioxin/furan congeners in melted slag of ash from municipal solid waste incinerators

AU - Kim, Ki Heon

AU - Seo, Yongchil

AU - Nam, Hoon

AU - Joung, Hyun Tae

AU - You, Jae Cheon

AU - Kim, Dong Jin

AU - Seo, Yong Chan

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Y1 - 2005/1/1

N2 - Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in slag of fly ash from three municipal solid waste (MSW) incinerators were analyzed to observe any changes in characteristics and distribution of their congeners by melting process. Actual concentration and Toxic Equivalent (TEQ) concentration profiles of 17 major congeners of PCDDs/PCDFs for gas, fly ash and melted slag were compared. The distributions of PCDDs/PCDFs in different streams macroscopically showed similarities with the generally known profiles for emission gas from a municipal waste incinerator. The total concentrations of PCDDs/PCDFs in off-gas and fly ash have been known to be a function of incineration conditions and of air pollution control device utilization; however, their normalized distributions were independent of such conditions. The concentrations of PCDDs/PCDFs in the melted slag of fly ash were not related to the concentrations of PCDDs/PCDFs congeners in fly ash but were rather a function of the melting furnace type and operation. The total amount of PCDDs/PCDFs in the melted slag of fly ash contained almost 150-27,000 times less dioxin than that in fly ash, however, the TEQ of dioxin in the slag was reduced by 435-43,500 times, which could enable them to be utilized as recycled construction materials. In normalized TEQ concentration profiles of 17 congeners of PCDDs/PCDFs, the ratio of PCDFs to PCDDs changed from 1.32 to 2.19 by melting, which showed relatively higher portion of furans left in melted slag than those in fly ash. By comparing reduction ratios of different congeners, PCDDs (dioxins) were relatively easier to destruct than PCDFs (furans) during melting process. The most difficult congener to destruct could be octa-chlorinated dibenzofuran (OCDF) among major congeners. For slag cooling methods, dioxin concentration in TEQ of slow cooled slag by air was four times higher than that of fast cooled slag by water. Thus cooling by water is more appropriate with the added beneficial effect of producing granules/particles, which can be utilized as roadbed materials.

AB - Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in slag of fly ash from three municipal solid waste (MSW) incinerators were analyzed to observe any changes in characteristics and distribution of their congeners by melting process. Actual concentration and Toxic Equivalent (TEQ) concentration profiles of 17 major congeners of PCDDs/PCDFs for gas, fly ash and melted slag were compared. The distributions of PCDDs/PCDFs in different streams macroscopically showed similarities with the generally known profiles for emission gas from a municipal waste incinerator. The total concentrations of PCDDs/PCDFs in off-gas and fly ash have been known to be a function of incineration conditions and of air pollution control device utilization; however, their normalized distributions were independent of such conditions. The concentrations of PCDDs/PCDFs in the melted slag of fly ash were not related to the concentrations of PCDDs/PCDFs congeners in fly ash but were rather a function of the melting furnace type and operation. The total amount of PCDDs/PCDFs in the melted slag of fly ash contained almost 150-27,000 times less dioxin than that in fly ash, however, the TEQ of dioxin in the slag was reduced by 435-43,500 times, which could enable them to be utilized as recycled construction materials. In normalized TEQ concentration profiles of 17 congeners of PCDDs/PCDFs, the ratio of PCDFs to PCDDs changed from 1.32 to 2.19 by melting, which showed relatively higher portion of furans left in melted slag than those in fly ash. By comparing reduction ratios of different congeners, PCDDs (dioxins) were relatively easier to destruct than PCDFs (furans) during melting process. The most difficult congener to destruct could be octa-chlorinated dibenzofuran (OCDF) among major congeners. For slag cooling methods, dioxin concentration in TEQ of slow cooled slag by air was four times higher than that of fast cooled slag by water. Thus cooling by water is more appropriate with the added beneficial effect of producing granules/particles, which can be utilized as roadbed materials.

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