| 英文摘要 |
The main objective of this study is to investigate the total dioxin
toxicity equivalency quotients (TEQs) of PCDD/Fs in the multi-media of
the area around three large municipal solid waste incineration (MSWI)
facilities; i.e., Hsingden Plant, Houli Plant, and Kaoshung City
Southern District Plant.
The results show that the mean dioxin TEQs of the ambient air, soils,
and vegetations around the Hsingden plant were 0.046 pg I-TEQ/m3, 13.6
ng I-TEQ/kg d.w., and 2.59 pg I-TEQ/g d.w., respectively. In the case
of the area around the Houli plant, the dioxin TEQs were 0.045 pg
I-TEQ/m3, 7.51 ng I-TEQ/kg d.w., and 2.58 pg I-TEQ/g d.w. in the ambient
air, soils, and vegetations, respectively. For the area around the
Kaoshung City Southern District Plant, the dioxin TEQs of the ambient
air, soils, and vegetations were determined to be 0.120 pg I-TEQ/m3,
3.36 ng I-TEQ/kg d.w., and 3.89 pg I-TEQ/g d.w., respectively.
The possible emission sources of PCDD/Fs at each sampling site were
further investigated by carrying out PCA and Cluster analysis using data
collected from this study and the dioxin congener pattern established
from local stack emission database. It was found that, for a given
tested facility, the variation of PC1 (Principal Factor 1) was above
90%. Therefore, the operations of the three investigated MSWI
facilities are unlikly the major sources of the dioxin to their
surrounding area.
In addition, this project reviewed and analyzed the data collected
from previous similar studies conducted by Taiwan’s EPA from 2000-2007.
According to the results from Mann-Kendall Trend test, neither
increasing nor decreasing trend was statistically observed on the
concentrations of PCDD/Fs in the ambient air, soils, and tree leaves
of each sampling site. Therefore, it can be concluded that the
operations of large MSWI facilities in Taiwan did not observably affect
the concentrations of PCDD/Fs in the surrounding environments.
In summary, the dioxin emission regulations for specific industries
implemented by Taiwan’s EPA since 1997 have effectively controlled the
emissions of PCDD/Fs from various incineration/combustion processes.
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