| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 104 === Most studies of biodiesels as alternative fuels for diesel engines focus on reducing the emissions of traditional gaseous pollutants (e.g. HC, NOx and CO), PM, carbon species and PAHs. Little attention has been paid to the emissions of persistent organic pollutants (POPs) from engines. This study elucidates the characteristics of persistent organic pollutants (POPs), including polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), polychlorinated biphenyl (PCBs), polybrominated dibenzo-p-dioxins and polybrominated dibenzofurans (PBDD/Fs) and polybrominated diphenyl ethers (PBDEs), that are emitted from a generator (non-road diesel engine) that is fueled with a blend of waste cooking oil biodiesels (WCO-biodiesels). Experimental results reveal that the mass concentrations of PCDD/Fs, PCBs, PBDD/Fs and PBDEs from the diesel generator that was fueled with petroleum diesel (D100) under loads of 1.5 kW and 3.0 kW were 583–875 pg Nm-3, 580–810 pg Nm-3, 982–1408 pg Nm-3, and 134–216 ng Nm-3, respectively, while the toxicity concentrations of PCDD/Fs, PCBs, and PBDD/Fs were 33.2–58.6, 2.72–3.11, and 1.54–2.30 pg WHO2005-TEQ Nm-3, respectively. The mass and toxicity concentrations of the POPs that were emitted in the exhaust decreased as the percentage of added WCO-biodiesel increased from 0 vol% to 40 vol%, regardless of the loading, except for the toxicity concentration of W40. The reductions of the mass concentrations of the four POPs followed the order PBDEs >> PCDD/Fs > PCBs ≒ PBDD/Fs, and the reduction rates followed the order PBDEs > PCDD/Fs > PCBs > PBDD/Fs. However, the toxicity concentrations of these POPs followed the order PCDD/Fs > PCBs > PBDD/Fs. Therefore, WCO-biodiesels can feasibly be used as an alternative generator fuel, favoring the recycling/reuse of waste oils and mitigating hazards to human health and environment.
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