本研究探討A焚化廠營運期間之廢氣所排放的 PCDD/Fs 與重金屬之特徵,及初探其對周界土壤潛在的環境影響,並利用採樣所得資料建置資料庫,利用加強因子分析方法(Enrichment Factor, EF)進行比對。研究結果得知:A焚化廠飛灰與周界土壤中 PCDD/Fs 實測濃度和毒性濃度分別以 OCDD 與 2,3,4,7,8-PeCDF 貢獻量最大,利用加強因子法將此兩根作為參數進行比對,可獲知A焚化廠 PCDD/Fs 之 EF 特徵值,其結果顯示飛灰中 PCDD/Fs 之 EF 值 < 2,周界土壤中 PCDD/Fs 之 EF 值約 < 0.5。飛灰與焚化廠周界土壤中之 EFPb/Hg、EFCd/Hg、EFPb/Cd 平均值皆約為 1.00。另飛灰中氯(Cl)含量(wt%)與飛灰中 PCDD/Fs 含量數有高的相關性(R2=0.862);根據推估A焚化廠平均每年排出 0.0234 g I-TEQ/yr 之 PCDD/Fs ,平均每年約有 0.0178 g I-TEQ/yr 可能累積在其周邊土壤中。
The object of this study is to explore the incinerator emissions and examine the levels and characteristics of PCDDs/Fs and heavy metals in the vicinity soil of Municipal Solid Waste Incinerator. The levels of PCDDs/Fs and heavy metals in soil and fly ash samples collected were investigated. It was found that PCDDs/Fs measured in the ambient soil range from 0.0034 to 6.570 ng/g•dw(n=14) and PCDDs/Fs measured in the fly ash range from 0.487 to 22.560 ng/g•dw(n=2). The results obtained from this study inclicate that the OCDD had the highest contribution to the total PCDDs/Fs content, but if based on I-TEQ content, 2,3,4,7,8-PeCDF is the PCDDs/Fs congener with the highest toxicity contribution on fly ash, however, OCDD was found to be the greatest contributor to the both total content and I-TEQ content on soil. Moreover, the Enrichment Factor is suggested using the representative congeners I-TEQ content of 2,3,4,7,8-PeCDF and OCDD to characterize the fly ash and soil. The findings obtained that the PCDDs/Fs EF value below 2 for fly ash and EF value below 0.5 for ambient soil. And EFPb/Hg、EFCd/Hg、EFPb/Cd mean value approximately 1 both for fly ash and ambient soil. The EF value will provide PCDDs/Fs and heavy metals fingerprint information of the incinerator. In addition, the correlation between PCDDs/Fs content(ng/g•dw) and the chlorine content(wt%) in the fly ash have high correlation(R2=0.862).