PCDD/F Characteristic in the Exhaust of Mobile Sources

• Main Authors: Shiu-chou Chen, 陳仕洲
• Other Authors: Wen-jhih Lee
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/05714094044329176795

碩士 === 國立成功大學 === 環境工程學系碩博士班 === 96 === For these years, mobile pollution emission sources have contributed more and more in domestic polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs), This study examined the characteristics of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) in the exhaust gases of mobile sources. In this study, 50 vehicles of petrol SUV car, 15 vehicles of diesel oil limousine, 2 heavy-duty diesel vehicles and 10 motorcycles were investigated. The PCDD/Fs emission factors of mobile sources were determined‚ and the overall emission quantity of PCDD/Fs from the domestic mobile sources was estimated. Finally, the influence of these emission sources on the surrounding environment was assessed. The total PCDD/F concentrations exhaust from SUV, diesel vehicles, heavy-duty diesel vehicles and motorcycles are 0.0553, 0.0417, 0.145 and 0.0591 ng I-TEQ/Nm3, respectively. The PCDD/F emission factors from SUV, diesel vehicles, heavy-duty diesel vehicles and motorcycles are 0.113, 0.105, 1.86 and 0.0831 ng I-TEQ/km, respectively. The particulate-phase of PCDD/Fs in the exhaust gases of SUV, diesel vehicles, heavy-duty diesel vehicles and motorcycles are 74.4%, 91.8%, 70.2% and 85.1%, respectively. Moreover, the mean I-TEQ concentration in particulate-phase is 79.8%. Due to the relatively high fraction of PCDD/Fs in particulate-phase, the PCDD/Fs emission can be effectively controlled by reducing the emission of particle in the exhaust gases of vehicles. After using new engine oil old engine oil, the PCDD/Fs concentrations in particulate-phase were reduced 38.2% (from 0.0445 to 0.0275 ng I-TEQ/Nm3) and 58.2%(from 0.0631 to 0.0264 ng I-TEQ/Nm3), respectively, for L type and N type mechanical bicycles. The emission factors of PCDD/F I-TEQ were also reduced 53.5% (from 0.141 to 0.0655 ng I-TEQ/km) and 56.6% (from 0.105 to 0.0456 ng I-TEQ/km), respectively, for L type and N type mechanical bicycles. The trend of PCDD/F concentrations and I-TEQ emission factors indicated that using the new engine oil can reduce the PCDD/Fs emission of vehicles. The research result shows the average PCDD/Fs concentrations in ambient air nearby M site (municipal solid waste incinerators [MSWIs]) is 0.0418 pg I-TEQ/Nm3, we compared cross-section of above PCDD/Fs with that inside the incinerator tunnels and SUV, diesel vehicles, heavy-duty diesel vehicles and motorcycles and found that there is no prominent relationship between cross-section characteristics of PCDD/Fs around the incinerators and inside their tunnels but cross-section characteristics of PCDD/Fs around the incinerators are so similar to out test vehicles. Therefore, we predict concentration of PCDD/Fs n ambient air nearby incinerators should be affected by mobile pollution emission sources which nearby them.