碩士 / 嘉南藥理大學 / 環境資源管理系 / 106 / The main purpose of this study is dedicated to test the environmental fate of Hexachlorobenzene (HCB) in the sediments of Er-Ren River natural environment. The river sediments in the upstream and downstream areas of Nan-Din Bridge were collected as the subjected matrix. According to the processing methods, it is divided into four researches, and the individual result showed:
(1) Amending HCB in the sediment waters to reach a final concentrations of 2 ppm and 10ppm respectively, the sets of 2 ppm HCB showed 30~36% of HCB degradation by the upstream sediment microorganisms, and 1.3 ppm of the residual concentration. Meanwhile, downstream microorganisms could reach 42% to 48% of HCB degradation, and get the residual concentration of 1.1 ppm. In the sets of 10 ppm amendment, the upstream microorganisms could degrade HCB to about 70% with the residual concentration about 2.8 ppm, the downstream’s degradation was about 64%, and the residual concentration was about 3.6 ppm.
(2) In the sets of amending HCB in the river sediments to a concentration of 2 ppm, HCB was 68% degraded in the upstream sediment and 73% in the downstream sediment. And in the sets of 20 ppm amendment, HCB was 64% degraded in the upstream sediment and 72% in the downstream sediment.
(3)The movement and degradation tests of HCB were constructed by divided tested sediments into three layers (upper, middle and lower). And the degradation results showed similar HCB degradation within the lower layer and the middle layer, however, the upper layer was less-degraded with the inhibition of the oxygen.
(4) In environmental distribution tests of HCB by adding 0.1 ppm of HCB per week to the Simulated Aquarium Boxes (SAB), 1.56 ppm of HCB was first found in the upper layer sediment after eight weeks of treatment. At the 16th week, 3.68 ppm HCB was detected in the upper layer. As well as 0.14 ppm HCB was first detected in the middle layer at 12th week and 0.58ppm at 16th week. No HCB was found in the lower layer with 16 weeks. It suggested that HCB will transport by the water flow and deposit in the surface of sediment, but not significantly diffuse into the lower and bottom layers.
| Identifer | oai:union.ndltd.org:TW/106CNUP0399001 |
| Date | January 2018 |
| Creators | LAI，WEI-ZHI, 賴偉智 |
| Contributors | I.-M. 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 | 94 |
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