研究生: |
藍培倫 Pei-Lun Lan |
---|---|
論文名稱: |
硒銫在粉碎泥岩的吸附與擴散行為 Sorption and Diffusion Behaviors of Se and Cs on Mudstone |
指導教授: |
許俊男
Chun-Nan Hsu |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
原子科學院 - 生醫工程與環境科學系 Department of Biomedical Engineering and Environmental Sciences |
論文出版年: | 2006 |
畢業學年度: | 94 |
語文別: | 中文 |
論文頁數: | 88 |
中文關鍵詞: | 硒 、銫 、泥岩 、好氧 、厭氧 、吸附 、脫附 、擴散 |
外文關鍵詞: | Se, Cs, mudstone, aerobic, anaerobic, sorption, desorption, diffusion |
相關次數: | 點閱:3 下載:0 |
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本研究的目的為分析硒、銫在台灣恆春泥岩中的吸脫附反應與擴散行為,以提供放射廢棄處置場安全評估的參考。實驗內容包括泥岩的固相分析、等溫批次實驗、動力吸脫附實驗、以及管柱擴散實驗。等溫批次實驗分別在好氧與厭氧環境下同時進行,並將實驗結果利用Freundlich和Langmuir經驗吸附模式進行擬合,找出濃度與吸附量的關係。擬合結果顯示:除了Cs在好氧和厭氧地下水中與Se在海水厭氧中較符合Freundlich模式外,其餘皆以Langmuir結果較合適。動力吸脫附實驗也分別在好氧與厭氧環境下進行,實驗結果利用單位元及雙位元模式擬合得到平衡濃度等其他參數。實驗發現Cs吸脫反應在一小時內即達平衡,使的擬合曲線結果不甚理想。而Se擬合結果皆以雙位元較適合,顯示有明顯塊反應與慢反應的部分。擴散則參考先前膨潤土的結果,選用一公分的厚度,並且進行三重複實驗,將每根管柱的擴散參數求平均。結果顯示,泥岩在地下水中有較好的遲滯效果,而泥岩對於Se的遲滯則比Cs好。
This study attempts to investigate that sorption and diffusion behaviors of Se and Cs on mudstone for safety assessment of underground radiowaste repository. In order to understand the sorption and diffusion behaviors on mudstones , experiments including solid analysis, batch tests , kinetic sorption/desorption test and column diffusion test. Solid analysis shows that major mineral compositions and other properties of mudstone. From batch tests,it is observed that differences of Kd values between anaerobic condition and aerobic condition regardless of GW or SW. Based on the results, Freundlich and Langmuir isotherm models have been determined the radionuclides concerntration ratio of liquid and solid. From most kinetic sorption/desorption tests, Cs reacts equilibrium imediately; Se sorps onto mudstone slowly and reaches equilibrium during 14-days experiment. In the column diffusion tests, exact analytical solutions have been used in lieu of the method suggested by Crank (1975), to find the apparent diffusion coefficient (Da). Results of diffusion tests show higher retardation factors in groundwaterand also show a beter retardation effect in Se solutions.
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