• Title, Summary, Keyword: MSWI

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The analysis and leaching characteristics of organic compounds in incineration residues from municipal solid waste incinerators (생활폐기물 소각시설 소각재에서의 유기오염물질 정성분석 및 용출특성)

  • Hong, Suk-Young;Kim, Sam-Cwan;Yoon, Young-Soo;Park, Sun-Ku;Kim, Kum-Hee;Hwang, Seung-Ryul
    • Analytical Science and Technology
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    • v.19 no.1
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    • pp.86-95
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    • 2006
  • This study was carried out to estimate leaching characteristics of incineration residues from municipal solid waste incinerators, and determine organic compounds in raw ash, leaching water and leaching residue. A total of 44 organic compounds, which were analyzed by GC/MSD and identified by wiley library search, were contained in bottom ashes. A total of 17 organic compounds were contained in fly ashes. Bottom ash and fly ash were found to contain a wide range of organic compounds such as aliphatic compounds and aromatic compounds. Organic compounds such as Ethenylbenzene, Benzaldehyde, 1-Phenyl-Ethanone and 1,4-Benzenedicarboxylic acid dimethyl ester were detected in raw ash, leaching water and residues (from bottom ash). Organic compounds such as Naphthalene, Dodecane, 1,2,3,5-Tetrachlorobenzene, Tetradecane, Hexadecane and Pentachlorobenzene were detected in raw ash, leaching water and residues (from fly ash). Through the leaching characteristics of incineration residue, it was represented that the open dumping of incineration residue can contaminate the soil and undergroundwater. In order to prevent environmental contamination that derived from extremely toxic substances in the incineration residues, it is particularly important that the incineration residues should be treated before disposal the incineration residues. Further study and proper management about leaching characteristics of organic compounds might be required.

Emission Character of Dioxins and Precursors in the Control Devices of the MSWI (II) (도시쓰레기 소각로 방지시설 중 다이옥신류 및 전구물질의 배출특성(II))

  • Shin, S.K.;Chung, Y.H.;Lee, W.S.
    • Analytical Science and Technology
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    • v.12 no.1
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    • pp.68-74
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    • 1999
  • The Concentrations of PCDDs/PCDFs and their precusors(chlorophenols, chlorobenzenes, PCB) were analyzed from the dioxin control device such as EP and SCR to know the emission patterns of these compounds and find the dioxin index compounds. The dioxin concentration increased 7 times in outlet part than inlet part of EP and the concentration of CBs, CPs and PCBs also were increased through this control device. These phenomia may be related to the operating temperature of Electroprecipitator(EP), which the operating temperature is near the $300^{\circ}C$, the method of the decreasing the operating temperature need to consider to prevent the formation of these compounds. In the selected catalytic reactor with wet scrubber(SCR+WS), these compounds were removed after passing the device over 90% for CPs, 30~40% for CBs and 60% for PCBs. But, the systematic study have to perform to reduce the formation of PCDDs/PCDFs and precusors.

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A Characteristics of Hg, Pb, As and Se Emitted from Small and Medium Size Waste Incinerator Stacks (중.소형 폐기물 소각시설에서 배출되는 수은, 납, 비소, 셀렌 배출특성)

  • Lee, Han-Kook;Moon, Bu-Shik;Lee, Dong-Hoon
    • Journal of Korean Society of Environmental Engineers
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    • v.27 no.11
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    • pp.1205-1214
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    • 2005
  • This study was carried out to investigate the emission characteristics of volatile metals(Hg, As, Se) and semi volatile metals such as Pb from small and medium size municipal solid waste incinerators(MSWIs). The concentrations of Hg, Pb, As and Se in emission gas from small size waste incinerators were higher than those of medium size waste incinerators. This is probably due to less air pollutant control devices and high emission gas temperature of the small size waste incinerators relative to the medium size waste incinerators. Emission gas temperature from small and medium size waste incinerators were divided into 2 groups. The first group was about $100^{\circ}C$ and the second roup in the range of $400{\sim}700^{\circ}C$. The concentrations of emission gas at the second group were Hg $70.43\;{\mu}g/Sm^3$, Pb $0.94\;{\mu}g/Sm^3$, As $9.83\;{\mu}g/Sm^3$ and Se $5.05\;{\mu}g/Sm^3$. The concentrations of Hg, Pb, As and Se at the first group were lower than those found at the second group. Besides, the removal efficiencies of Hg in medium size waste incinerators were $55.2{\sim}95.9%$. Emission gas temperature reduction from waste heat boiler(WHB) contribute to control of Hg. Based on above results, we postulate that the temperature of flue gas should play a very important role in volatile metal control in small and medium size MSWIs. In order to improve the volatile metals removal efficiency, the temperature of cooling system must be controlled and the air pollution control device should be operated properly.

Effect of magnetic separation in removal of Cr and Ni from municipal solid waste incineration (MSWI) bottom ash (생활폐기물(生活廢棄物) 소각(燒却) 바닥재의 자력선별(磁力選別)에 따른 크롬과 니켈의 거동(擧動))

  • Ahn, Ji-Whan;Um, Nam-Il;Cho, Kye-Hong;Oh, Myung-Hwan;You, Kwang-Suk;Han, Gi-Chun;Cho, Hee-Chan;Han, Choon;Kim, Byong-Gon
    • Resources Recycling
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    • v.16 no.6
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    • pp.3-9
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    • 2007
  • Although the ferrous material was separated by the magnetic separation before the incineration process, the municipal solid waste incineration bottom ash generated during incinerator in metropolitan area consists of many iron products which account for about $3{\sim}11%$ as well as ceramics and glasses. The formation of $NiFe_2O_4$ and $FeCr_2O_4$ with a $Fe_3O_4-Fe_2O_3$ (similar to pure Fe) on the surface of iron product was found during air-annealing in the incinerator at $1000^{\circ}C$, because Ni and Cr has a chemical attraction about iron is using to coat with Ni and Cr metals for poish or to prevent corrosion. Therefore, Fe-Ni Cr oxide can be formed on durface of the iron product and it can be separated from bottom ash through the magnetic separation. So, in this study, the separation ratio of heavy metals as magnetic separation and mineralogical formation of Fe-ion(heavy metal) in ferrous metals corroded were investigated. As the result, the separation ratio of Ni and Cr based on particle sizes accounted for about $45{\sim}50%$, and Cu and Pb accounted for below 20%. Also, the leaching concentration of Ni and Cr in bottom ash separated by magnetic separation was lower than that in fresh bottom ash.