本研究以TFT-LCD廠排放之高濃度含磷廢水為目標，利用人工配置之模擬含磷溶液，進行各種可能之磷酸鹽（Ca、Mg、Fe(II、III)、Al）流體化床結晶技術研究。除了大幅將含磷廢水濃度提升至1000 mg-P/L的高負荷，並操作不同進料莫耳比(Me/P)、pH值等變因，找出該技術的最佳操作條件；另針對結晶過程之行為與結晶珠之性質進行深入探討，務求確實評估應用於實廠之可行性。
本研究顯示使用Ca2+、Mg2+、Fe2+等流體化床結晶技術技術適合用來處理低濃(100 mg-P/L)含磷溶液，結晶效率皆可達到70%以上；Fe3+、Al3+等三價金屬鹽，結晶效率亦分別有60%與45%。而使用Ca2+、Fe2+等流體化床結晶技術適合用來處理高濃(1000 mg-P/L)含磷溶液，結晶效率更可達到80%以上；另外，Mg2+、 Fe3+、Al3+等金屬鹽，結晶效率則普遍不理想，主要原因為過飽合度與其他多重干擾影響。此時使用Ca2+之最佳操作條件為：Ca/P=2.0、pHeff=6.0，使用Fe2+之最佳操作條件為：Fe/P=1.2、pHeff=6.0。將以上研究用於處理高濃(1000 mg-P/L)之實廠綜合廢液，去除效果穩定且結晶效率平均可達到70%以上，在實廠應用上具可行性。
磷酸鈣流體化床結晶技術操作過程中，於低過飽和度時，易形成CaHPO4．2H2O的片狀結晶；於高過飽和度時，則易形成Ca5(PO4)3OH的非晶態塊狀成核。而磷酸亞鐵系統中，無論在何種條件(濃度、pH、Fe/P)下，皆易形成Fe3(PO4)2．8H2O的粒狀結晶產物。磷酸鎂、磷酸鐵與磷酸鋁流體化床結晶技術操作過程中，推估主要分別形成Mg3(PO4)2、FePO4．Fe(OH)3、AlPO4．H2O等結晶產物。

The objective of this study is a highly phosphorus concentration of waster water from TFT-LCD factory. All potential phosphate compound (Ca, Mg, Fe(II, III), Al) will be used to treat simulated phosphorus solution by FBC technology. The Concentration of phosphorus will elevate to 1000 mg-P/L in this study. In order to find out the optimum condition of FBC technology, experiments will operate by molar ratio (Me/P) and pH value. Moreover, this study will also discuss in the behavior during crystallization process and the property of crystal pellet. All the trials will evaluate the feasibility in real factory application.
It shows that Ca2+, Mg2+, and Fe2+ FBC technology are suitable to deal with low concentration (100 mg-P/L) phosphorus waste water, and the crystal removal efficiency is over 70%. The crystal removal efficiency of Fe3+ and Al3+ FBC technology is 60% and 45%. Ca2+、Mg2+ FBC technology are suitable to deal with high concentration (1000 mg-P/L) phosphorus waste water, and the crystal removal efficiency is over 80%. The crystal ratio of Mg2+, Fe3+, and Al3+ FBC technology is not good because the effective of supersaturation and others. The optimum condition of Ca2+ system is: Ca/P=2.0, pHeff=6.0, and the optimum condition of Fe2+ system is: Fe/P=1.2, pHeff=6.0. Research in real factory waste water (1000 mg-P/L) is based on previous studies. It demonstrates a stabilize efficiency and the average crystal removal efficiency is over 70%, and its application in real factory is feasible.
During the FBC technology of calcium phosphate operation , CaHPO4．2H2O forms easily in lower saturation and Ca5(PO4)3OH forms easily in higher supersaturation. In addition, the morphology of CaHPO4．2H2O is flake, and Ca5(PO4)3OH is an amorphous type of lump. During the FBC technology of iron (II) phosphate operation, granule of Fe3(PO4)2．8H2O forms in all conditions (concentration, pH, Fe/P). Mg3(PO4)2 , FePO4．Fe(OH)3, and AlPO4．H2O forms during the FBC technology of magnesium phosphate, iron (III) phosphate, and aluminum phosphate operation.

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