在現今人類生活中，鎳於電鍍、塑料製造、金屬加工及顏料等工業被大量使用，也一併產生了含鎳廢水的後續問題。流體化床均質結晶(FBHC)技術為ㄧ個能有效去除重金屬的高級廢水處理技術，此技術能解決傳統混凝沉澱法會生成高含水率污泥的問題，並能以不加入異質擔體的方式，於系統中合成出純度高、低含水率的結晶顆粒以回收廢水中的重金屬元素。
本研究主要以1000 ppm高濃度含鎳合成廢水作為處理目標，利用FBHC技術分別以碳酸作沉澱劑合成鹼式碳酸鎳(NiCO3·xNi(OH)2·yH2O)，以及使用次氯酸鈉作氧化劑合成出於電池材料產業大量使用的鹼式氧化鎳(NiOOH)。
於FBHC合成鹼式碳酸鎳顆粒的研究中，對pHe、CO3/Ni、LNi、HRT及床高等變因進行探討。在最適化的操作條件下(CNi,in = 1046 ppm, pHe = 10.0, CO3/Ni = 0.73, HRT = 16.4 min, U = 39.8 m/hr, H = 60 cm)，可達到94.6 %的鎳結晶率(CR)以及99.8 %的去除率(TR)，出流水鎳濃度降至1.26 ppm。在操作於鎳之進料流速為30 ml/min的條件下，當截面負荷控制於2.5 kg m-2 hr-1以內時，系統能維持於94.5 % - 98 %的CR。
於FBHC合成鹼式氧化鎳顆粒的系統中，研究發現自由氯會近完全消耗，在最適化的操作條件下(pHe = 9.2, Clfree/Ni = 1, CO3/Ni = 1, HRT = 16.4 min, U = 42.9 m/hr)，達到98 %的CR以及99.6 %的TR，出流水鎳濃度降至2.31 ppm、餘氯濃度為0.14 ppm。在操作於鎳之進料流速為30 ml/min的條件下，當截面負荷控制於3.5 kg m-2 hr-1以內時，CR值為96 % - 98 %，說明鹼式氧化鎳比鹼式碳酸鎳具有更優異的結晶顆粒能力。
最後，在FBHC顆粒的產品鑑定方面，以SEM分析所了解，兩項產品顆粒的內外部為相異結晶結構的均質結晶物。以XRD、FTIR、EDS、TGA等分析，可證實用碳酸所合成出的顆粒產物為NiCO3·xNi(OH)2·yH2O。以次氯酸鈉作氧化劑所生成的的黑色均質顆粒主要成份為帶有結晶水的NiOOH·x Ni(OH)2。

This study investigated the nickel recovery from wastewater by fluidized-bed ho-mogeneous crystallization (FBHC) technology. FBHC technology could recover nickel from wastewater and solved the question from chemical precipitation method producing high moisture content sludge. In this research, it would recover low moisture content with high purity basic nickel carbonate particles (NiCO3·xNi(OH)2·yH2O) and nickel oxide hydroxide (NiOOH) particles which was widely used in battery factories. In the recovery basic nickel carbonate particle, the experiment was conducted at suitable conditions (CNi,in = 1046 ppm, CO3/Ni = 0.73, pHe = 10.0, HRT = 16.4 min, U = 39.8 m/hr, H = 60 cm), the CR (Crystallization ratio of nickel) and TR (Total nickel removal) could reach up to 94.6 % and 99.8 %. For XRD and FTIR analysis, the particle of FBHC was Ni-CO3·xNi(OH)2·yH2O. In the recovery of nickel oxide hydroxide particle, the concentra-tion of residual chlorine almost consumed completely because NiOOH would become Ni(OH)2 by reacting with water. When operated at suitable conditions (CNi,in = 1069 ppm, Clfree/Ni = 0.98, CO3/Ni = 1.08, pHe = 9.22, HRT = 16.4 min, U = 42.9 m/hr, H = 60 cm), the CR and TR could reach up to 97.9 % and 99.6 %. For XRD and FTIR, the particle of FBHC was NiOOH·xNi(OH)2 and water of crystallization.

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