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題名 | 以選擇性離子交換媒去除廢液中銫核種之質傳探討=Removal of the Cesium Nuclide from Wastewater by Selective ion Exchanger: A Mass Transfer Study |
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作者 | 詹瑞裕; 陳靖良; Chan, Ruey-yu; Chen, Ching-liang; |
期刊 | 核子科學 |
出版日期 | 19990400 |
卷期 | 36:2 1999.04[民88.04] |
頁次 | 頁134-144 |
分類號 | 449.8 |
語文 | chi |
關鍵詞 | 選擇性離子交換; 質傳; 銫核種; Selective ion exchange; Mass transfer; Cesium nuclide; |
中文摘要 | 本研究利用批次平衡及管柱實驗探討選擇性離子交換媒Durasil�� D-230去除放射 性廢液中�� Cs 核種之質傳現象。由批次平衡實驗顯示,當攪拌速率增快時,液相層擴散阻 力減少,其質傳機制由液相層擴散控制轉為顆粒擴散控制。由管柱實驗結果顯示,交換床中 質傳區域長度隨著液體流速之加快呈線性增加趨勢,且由 Doulah-Jafar 方法求得突破曲線 之圖形因子β值接近 1,可以驗證交換床中之質傳機制為顆粒擴散控制。另外,本研究也以 Thomas 數學模式求出離子交換床之傳送單位數( N )、系統質傳係數( Ka )及分配係數 ( Kd )等重要質傳參數, 用來預測 D-230 交換媒之管柱流出液突破分率與廢液處理量之 關係,預測結果與實驗數據相當吻合。 |
英文摘要 | The mass transfer phenomena of using selective ion exchanger Durasil�� D-230 to remove the �� Cs nuclide from radioactive liquid waste has been investigated by batch equilibrium and dynamic column tests. The batch equilibrium tests showed that the film resistance of mass transfer was reduced at higher agitation speed (>300 rpm) and the rate-controlling step shifted from liquid film diffusion to particle diffusion. From the column tests, it showed that the length of mass transfer zone was nearly proportional to the superficial liquid velocity at normal operation conditions. And the shape factors of breakthrough curves, β s, determined by Doulah-Jafar method were nearly equal to one. All of the experimental results demonstrated that mass transfer mechanism was controlled by particle diffusion. In addition, parameters such as the number of transfer units, mass transfer coefficient and volumetric distribution coefficient have been determined employing the Thomas model. Correlation between the breakthrough percent of effluent and the processed liquid volume was predicted using the parameters. It revealed that the predictions agreed well with experimental data in this study. |
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