| 英文摘要 |
Dioxins (polychlorinated dibenzo-p-dioxin, PCDDs) and furans (polychlorinated dibenzofurans, PCDFs) and other pollutants as persistent organic pollutants which listed "hazardous air pollutants (Hazardous Air Pollutants, HAPs)" substances. Dioxin is not easy to decomposed and long-term stay in the natural environment. To safeguard public health and environmental quality of life, it is necessary to investigate the distribution and characteristics of dioxin in the fine particle. In this study, we conducted the dioxion major emission sources, such as cogeneration plant, municipal waste incinerators(MWI), electric arc furnace(EAF), and the distribution of PM2.5 of dioxin, metal, carbon, water-soluble ions in ambient air near stationary sources,and using Positive Matrix Factorization model (PMF) to analysis the source apportionment.The results showed that the highest concentration of PM2.5 was 0.53±0.39 mg/Nm3 in cogeneration plant flue gas; the highest concentration of dioxin was 0.206±0.107 ng I-TEQ/Nm3 in EAF flue gas.The distribution of dioxin species, cogeneration plant and MWI flue gas had higher proportion of PCDDs than PCDFs, but EAF flue gas had higher proportion of PCDFs than PCDDs in PM2.5 and vapor phase. In cogeneration plant flue gas of PM2.5, the main metal were Ca, Al, Fe, the highest water-solube ions was SO42- ,and OC/EC ratio was 0.78. In MWI and EAF flue gas of PM2.5, the main metal were Ca and Zn respectively, the highest water-solube ions were Cl- and OC/EC ratios were greater than 2.0. In the ambient around the stationary sources, the highest concentration of PM2.5 was 35.1±4.75 μg/ m3 in EAF downwind site, the highest dioxin concentration of PM2.5 (Vapor+Solid) was 31.1±16.3 fg I-TEQ/m3. The distribution of dioxin species around the stationary sources were PCDFs in vapor phase, the main metal were Na, K and Ca, the highest concentrations of water-soluble ions were nss-SO42-,and OC/EC ratios were greater than 2.0 that indicated the species generated from secondary aerosol. The result of PMF also showed that analysis of atmospheric dioxins in the vicinity of cogeneration plant, around 23.7% dioxins were provided from cogeneration plants investigated. In the vicinity of of the MWI, around 8.3% from the incinerator investigated. In the vicinity of of the EAF, around 52.2% from the EAF investigated. The results of this study has been initially completed the fingerprints characteristics of cogeneration plants, MWI, EAF in Taiwan.
|