本研究針對B廠及M廠二座都市垃圾焚化廠分別進行煙道廢氣及廠內外空氣中戴奧辛/呋喃及重金屬之檢測，期望能建立垃圾焚化廠廠內外空氣中PCDD/Fs及重金屬濃度資料，亦提供風險評估所需之有用資訊。另外經由垃圾焚化爐煙道廢氣與周界大氣之實際採樣分析數據，鑑定焚化爐對周界大氣之影響。所得結論歸納如下：1. B焚化廠及M焚化廠煙道廢氣中PCDD/Fs平均濃度分別為0.948和4.35 ng/Nm3；總I-TEQ則分別為0.0361和0.157 ng-I-TEQ/Nm3。2. B焚化廠第一季煙道廢氣中Cu、Zn、Cd、Pb及Hg濃度分別為0.03、0.726、0.007、0.116及0.009 mg/Nm3；第二季其值分別為0.00466、0.123、0.000977、0.0200及0.0199 mg/Nm3。M焚化廠第一季煙道廢氣中Cu、Zn、Cd、Pb及Hg濃度分別為0.015、0.162、0.007、0.127及0.009 mg/Nm3；第二季其值分別為0.0107、0.205、0.0006、0.0528及0.0009 mg/Nm3。3. B焚化廠及M焚化廠周界大氣中PCDD/Fs濃度分別介於0.468 ~ 4.28和0.179 ~ 1.77 pg/Nm3之間，平均分別為1.51和0.845 pg/Nm3；總I-TEQ則分別介於0.0315 ~ 0.206和0.0102 ~ 0.0986 pg-I-TEQ/Nm3之間，平均分別為0.0917和0.0464 pg-I- TEQ/Nm3。
4.由B焚化廠及M焚化廠周界大氣中PCDD/Fs濃度之等位軌跡圖及將煙道廢氣與周界大氣進行成分分析與階層集群分析結果顯示，B及M垃圾焚化廠對其周界大氣中PCDD/Fs濃度之影響並不顯著。5. B焚化廠第一季周界大氣中Cu、Zn、Cd、Pb及Hg平均濃度分別為0.0903、0.265、0.0015、0.0584 μg/Nm3及ND；第二季其值分別為0.128、1.01、0.00733、0.0521 μg/Nm3及ND。M焚化廠第一季周界大氣中Cu、Zn、Cd、Pb及Hg平均濃度分別為0.0619、0.0945、0.00056、0.0240 μg/Nm3及ND；第二季其值分別為0.106、0.168、0.00162、0.0121 μg/Nm3及ND。6. B焚化廠第一季及第二季廠內大氣中PCDD/Fs之平均濃度分別為38.4及3.91 pg/Nm3；總I-TEQ則分別為2.26及0.295 pg-I- TEQ/Nm3。M焚化廠第一季及第二季廠內大氣中PCDD/Fs之平均濃度分別為14.6及2.71 pg/Nm3；總I-TEQ則分別為0.402及0.126 pg-I- TEQ/Nm3。7. B廠第一季廠內大氣中Cu、Zn、Cd、Pb及Hg平均濃度分別為0.394、5.08、0.0355、1.01及0.0052 μg/Nm3；第二季其值分別為0.235、1.89、0.0424、0.593及0.00478 μg/Nm3。M廠第一季廠內大氣中Cu、Zn、Cd、Pb及Hg平均濃度分別為0.592、0.425、0.0043、0.171及0.00017 μg/Nm3；第二季其值分別為0.395、2.12、0.0155、0.396 μg/Nm3及ND。8. B焚化廠第一季廠內大氣中PCDD/Fs之總I-TEQ和B焚化廠第一季周界大氣中PCDD/Fs之總I-TEQ相比，高了約十五倍左右；第二季則高了約六倍左右。M焚化廠第一季廠內大氣中PCDD/Fs之總I-TEQ和M焚化廠第一季周界大氣中PCDD/Fs之總I-TEQ相比，高了約五倍左右，第二季則高了約七倍左右。可見焚化廠內勞工PCDD/Fs之暴露風險值得進一步加強探討。9. 比較危害性較高的重金屬如：Cr、As、Cd和Pb在焚化廠內和焚化廠周界大氣中之濃度，B焚化廠方面，第一季廠內大氣中Cr、As、Cd和Pb等重金屬濃度分別為第一季周界大氣之5.3、5.5、23.6和17.3倍；第二季分別為7.0、0.92、5.8和11.4倍。M焚化廠方面，第一季廠內大氣中Cr、As、Cd和Pb等重金屬濃度分別為第一季周界大氣之1.9、1.6、7.7和7.1倍；第二季分別為0.72、1.8、9.6和32.7倍。

This study investigates the characteristics of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and metal elements in the stack flue gases, indoor air and outdoor air of two municipal solid waste incinerators (MSWIs, B and M). This work primarily attempts to set up information on the health assessment of PCDD/Fs and metal elements emitted from B and M. Additionally, this investigation assesses the influence of B and M emissions on outdoor air. This study reaches the following conclusions: First, mean PCDD/F concentrations in the stack flue gases of B and M were 0.0361 and 0.157 ng I-TEQ/Nm3, respectively. Second, Cu, Zn, Cd, Pb, Hg concentrations in the stack flue gases of B in seasons one and two were 0.03, 0.726, 0.007, 0.116 and 0.009 mg/Nm3 and 0.00466, 0.123, 0.000977, 0.0200 and 0.0199 mg/Nm3, respectively, while those of M were 0.015, 0.162, 0.007, 0.127 and 0.009 mg/Nm3 and 0.0107, 0.205, 0.0006, 0.0528 and 0.0009 mg/Nm3, respectively. Third, the PCDD/F concentrations in outdoor air of B and M ranged from 0.0315 to 0.206 pg I-TEQ/Nm3 (mean = 0.0917 pg-I-TEQ/Nm3), and from 0.0102 to 0.0986 pg I-TEQ/Nm3 (mean = 0.0464 pg I-TEQ/Nm3), respectively. Fourth, using multivariate exploratory techniques (cluster and factor analysis) to compare the congener profiles of PCDD/Fs in the stack flue gases and outdoor air with the equal concentration contours of PCDD/Fs in MSWIs outdoor air, demonstrated that B and M had a minimal influence on the surrounding environment. Five, the mean concentrations of Cu, Zn, Cd, Pb, Hg in outdoor air of B during the first and second seasons were 0.0903, 0.265, 0.0015 and 0.0584 μg/Nm3, ND and 0.128, 1.01, 0.00733 and 0.0521 μg/Nm3, ND, respectively, while those of Cu, Zn, Cd, Pb, Hg in outdoor air of M were 0.0619, 0.0945, 0.00056 and 0.0240 μg/Nm3, ND and 0.106, 0.168, 0.00162 and 0.0121 μg/Nm3, ND, respectively. Sixth, mean PCDD/Fs concentrations in the indoor air of B in seasons one and two were 2.26 and 0.295 pg I-TEQ/Nm3, respectively, while those of M were 0.402 and 0.126 pg I-TEQ/Nm3, respectively. Seventh, the mean concentrations of Cu, Zn, Cd, Pb, Hg in the indoor air of B in seasons one and two were 0.394, 5.08, 0.0355, 1.01 and 0.0052 μg/Nm3 and 0.235, 1.89, 0.0424, 0.593 and 0.00478 μg/Nm3, respectively, while those of M were 0.592, 0.425, 0.0043, 0.171 and 0.00017 μg/Nm3 and 0.395, 2.12, 0.0155 and 0.396 μg/Nm3, ND, respectively. Eighth, the PCDD/F concentrations in the stack flue gases of B were 15 and six times higher than in the outdoor air of B during seasons one and two, respectively. Notably, the PCDD/F concentrations in the stack flue gases of M were five and seven times higher than in the outdoor air of M in seasons one and two, respectively. Consequently, further research should be conducted on the exposure of laborers to PCDD/Fs the health implications of such exposure. Ninth, the mean concentrations of Cr, As, Cd, Pb in the indoor air of B were 5.3, 5.5, 23.6, 17.3 times and 7.0, 0.92, 5.8, 11.4 times higher than in the outdoor air of B in seasons one and two, respectively. Finally, the mean concentrations of Cr, As, Cd, Pb in the indoor air of M were 1.9, 1.6, 7.7 and 7.1 times and 0.72, 1.8, 9.6 and 32.7 times higher than in the outdoor air of M during seasons one and two, respectively.

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