碩士 / 嘉南藥理科技大學 / 環境工程與科學系暨研究所 / 97 / The main objective of this study was to determine the environmental dechlorination of hexachlorobenzene (HCB) in a simulated anaerobic condition within an aquarium box contained natural river sediments and waters. Three successive experiments were conducted, the first experiment was the primary test of Modified Permeable Column-Simulated Aquarium Box system (MPC-SAB), the second experiment was a test of Cup-SAB system, and the third one was the application of MPC-SAB system in the evaluation of HCB dechlorination and the movement of HCB and its dechlorination products.
In the first experiment, sediment samples used in the Modified Permeable Column-Simulated Aquarium Box system (MPC-SAB). were amended with 5 ppm of HCB, 2,3,4-CBp or 2,3,4,5-CBp, individually. After 60 days of incubation, the results showed that HCB was dechlorinated and HCB moved outward as well. After 120days, 2,3,4-CBp and 2,3,4,5-CBp dechlorination was both observed.
In the second experiment, dozens of 70 mm tall glass cups were fill with sediment samples that spiked with 5 ppm of HCB or 20 ppm of 1,2,3,4- TeCB. After 13 months, the level of HCB in the sediment with YE was significantly lower than that without YE. And HCB dechlorination products, such as QCB, 1,2,3,5- TeCB were also found in sediment with YE. For sediments mixed with 1,2,3,4-TeCB, sediment with YE showed the decrease of 1,2,3,4- TeCB and the products of 1,2,4-TCB.
In the third experiment, sediment samples with 5 ppm of HCB were applied in the Modified Permeable Column-Simulated Aquarium Box system (MPC-SAB). It was found that HCB dechlorination could be initiated within 30days and after that HCB could be transported to the middle and outer layer. HCB dechlorination products, QCB, 1,2,3,5-TeCB, 1,2,4-TCB, and 1,3,5-TCB were found in the core part, but never been visualized in the middle and outside layer.
The results suggested that Sediment microbes in Er-Jen River possessed HCB and PCBs dechlorination ability. HCB was easier to be degraded than PCBs showed the differentia of HCB-dechlorination consortium to PCBs’. However, this study revealed that the environmental remediation of HCB and PCBs was possible. It need more researches to promote the inherent dechlorinating activity of sediment microbes, especially for the dechlorination of PCBs.
| Identifer | oai:union.ndltd.org:TW/097CNUP5515007 |
| Date | January 2009 |
| Creators | I-Hsuan Chen, 陳怡璇 |
| Contributors | I-Ming Chen, 陳意銘 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 108 |
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