| Summary: | 碩士 === 國立成功大學 === 環境工程學系碩博士班 === 96 === The characteristics of carbonyl compounds (carbonyls) emissions and cytotoxicity of engine exhaust from a diesel generator fueled with pure palm-biodiesel (B100) and biodiesel blends (v/v) of 10% (B10), 30% (B30), 50% (B50) and 75% (B75) and pure fossil diesel (D) were investigated. The effects of varying output power of generator were also studied carefully. The carbonyls analyses were performed using a high performance liquid chromatography (HPLC), while the in vitro toxicity with the human bronchial epithelial cell line (Beas-2B) was evaluated by MTT assay.
The results of this study showed that total carbonyls emission concentration from five different blended biodiesels were higher than those from D, with the maximum total carbonyls emission found in B50 test. For other biodiesel tests, there was a positive correlation between the total carbonyls concentration and the biodiesel blended percentage (%). At all output power levels (0 kW, 4 kW, 13 kW and 22 kW), the B10 was observed to have higher total carbonyls emissions than that from the pure fossil diesel D. In the three non-idling tests, a negative correlation was found between the total carbonyls concentration and the output power (kW) in D and B10 runs. Acetaldehyde was the most abundant carbonyl compound in the exhaust, followed by formaldehyde, acetone and acrolein. These four major carbonyls emissions (MCE) accounted for 75% (B100) to 90% (B10) in total carbonyls concentration.
The results of MTT assay showed that the cytotoxicity of engine exhaust gas was higher than the particulates in all tested fuel. The cytotoxicity of exhaust did not increase with the biodiesel blended percentage, a high cytotoxicity was found while engine was fueled with B10, B50 and B75, especially B50. Compared with D, the B10 was observed to exhibit higher total cytotoxicity at all output power levels (0 kW, 4 kW, 13 kW and 22 kW), and the lowest cytotoxicity of engine exhaust from D and B10 was both found at the maximum output power.
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