焚化廠污染排放特徵與周界土壤污染物關聯性之研究—PCDD/Fs與重金屬

Abstract

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).