| 摘要: | 高科技產業快速發展，許多重金屬污染問題層出不窮。金屬表面處理、印刷電路板、半導體廠所排放之廢水含有高濃度之管制重金屬，若未能妥善處理這些廢水，將對環境、牲畜與人類造成嚴重的損害，本計畫以循環經濟之觀念，發展可處理及回收廢水中重金屬技術，另外，配合新南向政策，擬與泰國蒙庫國王科技大學攜手共同研究此議題。
本計畫將接續過去流體化床均質結/晶顆粒化之研究，有鑑於過去之研究成果發現，各種重金屬離子的操作條件不一，反應各異，無法直接將過去研究結果直接套用，而得到結晶顆粒，上流速度與反應pH階段性調整都會影響顆粒化是否成功，受各種陰離子及螯合劑的影響程度也都不同，而且電鍍廢水中經常是多種重金屬共存，因此，如何找出適當之操作條件處理此種廢水非常重要，所以，本計畫擬選擇Cu、Sn為主體進行多種重金屬(Ni, Pb, Zn, Fe)在流體化床均質結晶/顆粒化技術之研發。此研究計畫共分為三個年度進行。第一年，將設計一個合適於均質成核之流體化床反應槽。分別使用磷酸鹽均質成核結晶程序處理溶液中之銅、錫等重金屬，探討最適結晶劑/重金屬離子之配比條件，並依最適添加配比進行不同操作條件(pH、上流速度、截面積負荷、莫耳比、進料流量)之效應，研析反應因子(金屬離子、螯合劑、陰離子)對結晶/顆粒化之效應，找出重金屬均質成核結晶顆粒化程序與重金屬去除效率之影響。。第二年，使用碳酸鹽做為結晶劑，以結晶劑均質成核結晶程序處理溶液中之銅、錫等重金屬，探討最適結晶劑/重金屬離子之配比條件，並依最適添加配比進行不同操作條件之效應，研析反應因子影響對結晶/顆粒化之效應，找出重金屬均質成核結晶顆粒化程序與重金屬去除效率之影響。第三年，進行印證流體化床均質結晶/顆粒化處理程序處理實廠含多種重金屬廢水去除效率及操作條件。分別使用磷酸鹽及碳酸鹽做為結晶劑，探討最適結晶劑/重金屬離子之配比條件，並依最適添加配比進行不同操作條件效應之研究。
The high-tech industry is important for economy development in Taiwan, especially the metal surface treating, printed circuit board (PCB), photoelectricity and the semiconductor industries. The high-tech manufactures contains heavy metal and high concentrations phosphate. In this study, a homogeneous nucleation of fluidized-bed method for treating wastewaters containing heavy metals (Cu and Sn) will be investigated. This will be also an international collaborative project with King Mongkut’s University of Technology Thonburi for the New South Policy.
Based on the results obtained before, we found that the reaction conditions for each metal ion are very different. It is impossible to use the optimum operation conditions of a metal ion for another. The effect of chelating agents and anions on the reaction is also different. In addition, there are always many metal ions presenting in the wastewater together. Therefore, finding the optimum operation conditions is very important for treating copper and tin with other metal ions(Ni, Pb, Zn, Fe). This is a three-years’ project. In the first year, a feasible reactor for homogeneous nucleation was designed .The research focuses on heavy metal (Cu and Sn) removal by phosphate in the homogeneous nucleation. The effects of operation (pH, upflow velocity, surface loading, molar ratio, influent flow) and reaction (metal ions、chelating agents、anions) conditions will be investigated. In the second year, the project will use carbonate instead to carry out the experiments again. By the results from the study of the first and second years, suitable treated wastewaters by this crystallization/granulation process will be determined. In the third year, we will use the homogeneous nucleation of fluidized-bed method to treat the metal surface treating plants and printed circuit board real wastewater containing multiple heavy metal ions, and find the optimum operation parameters. |
