鋅金屬被普遍應用於電鍍、金屬加工、合金、橡膠業等工業製程上。舉凡開採鋅礦、鍍鋅加工、輪胎橡膠回收等工藝製程部份，在生產含鋅製品時，除了會造成鋅排放之外，也會衍生後續含鋅工業廢水處理的問題。本研究利用流體化床均質結晶(FBHC)的技術，於系統中合成出純度高、含水率低的難溶鋅化合物，以達回收廢水中的鋅之目的。
本研究主要以650 mg-Zn/L高濃度的含鋅合成廢水作為處理標的，首先以瓶杯實驗發現：不同加藥方法會影響最終沉澱產物的種類。利用低濃度鹼、低速率加藥化學沉澱法，由於pH的濃度梯度改變較小，最終的沉澱產物為氫氧化鋅；利用直接加液鹼的方式，由於滴入高濃度鹼會導致pH值的濃度梯度改變較大的情況，會先生成Zn(OH)42-、Zn(OH)3-，進一步轉換成ZnO成為最終沉澱產物。
後續依照瓶杯實驗的結果作為研究基礎，於流體化床均質結晶(FBHC)技術中以氫氧化鈉作為沉澱劑，並針對pHe、HRT、起始濃度(Czn,in)、截面負荷(Lzn)、床高的變因進行研究，在最適化的操作條件之下(Czn,in = 650 ± 20 mg-Zn/L, pHe =12.5 ± 0.2, HRT = 8.9 min, U=42 m/hr, R = 5.9, bed height = 35 cm)，合成出氫氧化鋅(ε-Zn(OH)2) 顆粒化產品，粒徑可達0.71 mm。系統的鋅結晶率(CR)達到95.98%，鋅去除率(TR)達到98.92%，回流口中可溶解性的鋅離子下降到3.49 mg-Zn/L。
最後在FBHC合成的均質顆粒產品的鑑定上，由SEM可以看出氫氧化鋅的均質顆粒為內部與外部結構一致的均質結晶物。TGA的分析結果可以發現其熱裂解溫度為153.5℃。並透過XRD、FTIR、EDS、TGA等分析，可以說明本研究合成的FBHC均質顆粒為氫氧化鋅(ε-Zn(OH)2)。

Zinc(II) is widely found in in effluents form such as factory of electroplating, hot-dip galvanizing, battery, alloy and paint. This work describes the removal of zinc ions from the solution by using sodium hydroxide as precipitants and reclaimed the zinc hydroxide through fluidized bed homogeneous crystallization (FBHC) process. The parameters considered were equilibrium of pH, surface loading of zinc and up-flow velocity. Synthetic zinc wastewater with concentration of 650 mg-Zn/L under the best conditions of pHe = 12.5 ± 0.1,HRT = 8.9 min, U = 42 m/hr, H = 35 cm. The result crystallizaiotn ratio (CR) and total removal of zinc achieved up to 96% and 99%. The zinc concentration in the effluent achieved 3.49 ppm. XRD and FTIR analysis suggest-ed that the crystal phase of reclaimed particle was ε-Zn(OH)2. The result of TGA revealed the thermal cracking temperature of reclaimed particle is a around 153.5℃. The size of particle from this work was around 0.71-1.00 mm, and the purity from these particles were around 93.9%.

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