臺灣博碩士論文加值系統

本研究以自行配製之含鎘及含鉛鎘混合吸附劑(高嶺土、氧化鋁、二氧化矽)為樣品，以固定床爐體進行熱處理，再將熱處理前後之樣品以「事業廢棄物毒性特性溶出程序」進行分析，探討其鉛鎘溶出值降低之情形，並將部分樣品以連續萃取法、XRD分析。 研究結果顯示，在含鎘吸附劑方面，三種吸附劑中以高嶺土對鎘之固定效果最好，且隨著熱處理溫度及時間之增加，其TCLP溶出值有下降之趨勢。而氧化鋁及二氧化矽對鎘亦有固定效果，但其溶出值曲線並無隨著熱處理溫度及時間之增加，而有下降之趨勢。在含鉛鎘吸附劑方面，氧化鋁及二氧化矽對鉛固定之效果較鎘佳；而高嶺土對鎘固定之效果較鉛佳。連續萃取分析之結果顯示，經熱處理後，鉛與鎘於氧化鋁中之移動性(mobilization)皆有減低之現象，且鉛減低之幅度較鎘為大，顯示在熱處理條件下，氧化鋁對鉛固定之效果較鎘佳。XRD分析的結果發現有單獨之Al2O3及CdO化合物存在，但尚未發現其它化學鍵結之存在。關鍵詞：吸附劑、重金屬、熱處理鉛鎘、連續萃取

The objective of this project was to study the sorption behavior between metal (Cd,Pb) and various sorbents at different thermal treatment temperatures and for various durations. Leaching procedure for solid waste were used to evaluate the effectiveness of thermal treatment. Some samples were examined using X-ray diffraction (XRD) technique. For Cd-doped sorbents, the results indicated that kaolinite was the most effective sorbent to capture Cd, comparing with Al2O3 and SiO2. Cd leaching value decreased as temperatures and/or durations increased. The Cd capture effectiveness by Al2O3 and SiO2 outran each other depending on thermal treatment temperatures and durations. For Pb- and Cd-doped sorbents, Al2O3 and SiO2 had higher effectiveness to capture Pb than to capture Cd. Kaolinite had higher effectiveness to capture Cd than to capture Pb. Sequential extraction results showed that the mobilization of Cd and Pb in Al2O3 decreased after thermal treatment. Keyword：sorbent, thermal treatment, sequential extraction, lead, cadmium-1 aThermal stabilization of metal by various sorbents