在日常生活中鈷扮演著重要的角色，不論是色玻璃、陶瓷、油漆甚至是磁鐵、研磨與人工關節到處都能發現到運用鈷的蹤跡，並且在半導體業的蓬勃發展下，會產出含有高濃度鈷、硼的廢水，由於本實驗室已有相當完善的除硼技術，所以本研究將會針對溶液中的鈷進行研究再結合本實驗室的除硼技術對實廠廢水進行處理。本研究會以化學沉澱法來區別不同pH值溶液中鈷離子去除的程度，並在了解產出的沉澱物種下，將實驗轉往流體化床均質顆粒化技術(FBHG)來做進一步操作，FBHG為一種能有效去除重金屬的高級廢水處理技術，此技術能夠解決傳統混凝沉澱法會生成高含水量汙泥的問題，並能夠在不加入額外擔體的操作條件下生成高純度、低含水量的結晶顆粒來回收廢水中的重金屬元素，並且在獲得FBHG系統操作的最適化條件後，最終能將高濃度鈷硼廢水處理至符合台灣工業放流水標準。
本實驗分為兩大階段，第一階段會以1,000 mg-Co/L的含鈷合成廢水作為研究目標，利用FBHG技術分別以碳酸作為沉澱劑合成鹼式碳酸鈷(Co(CO3)・x Co(OH)2・yH2O)，以及使用次氯酸鈉(NaClO)作為氧化劑合成羥基氧化鈷(CoOOH)。
於FBHG合成鹼式碳酸鈷的系統中，對pHe、CO3/Co、LCo、HRT與床高的變因進行討論，在最適化的操作條件下(CCo,in = 1,000 ± 50 mg-Co/L, CO3/Co = 1.8 ± 0.2, pHe = 9.0 ± 0.2, HRT = 10.89 min, U = 38.19 m/hr, H = 60 cm)，可達到98.2%的鈷造粒率(GR)與98.3%的鈷去除率(TR)，並將出流口鈷濃度降至9.01 mg-Co/L。
於FBHG合成羥基氧化鈷的系統中，則是對pHe、LCo、HRT與床高的變因進行討論，在最適化的操作條件下(CCo,in = 1,010 ± 20 mg-Co/L, CO3/Co = 0.90 ± 0.05, Clfree/Co = 1.05 ± 0.05, pHe = 6.7 ± 0.2, HRT = 16.3 min, U = 35.64 m/hr, H = 60 cm)，可達到92.7%的鈷造粒率(GR)與97.2%的鈷去除率(TR)，並將出流口鈷濃度降至13.98 mg-Co/L，代表鹼式碳酸鈷系統比起羥基氧化鈷系統有著較優異的結晶造粒能力。
接著，針對FBHG技術所產出的產品鑑定，透過SEM分析了解兩種顆粒皆為內外部結晶結構有所差異的均質結晶物，以XRD、FTIR、EDS、TGA、XPS等分析，可以得知利用碳酸系統的結晶產品為Co(CO3)・xCo(OH)2・yH2O；利用次氯酸鈉系統的結晶產物為CoOOH。
研究的最終階段則是透過FBHG技術所得之的最適化操作條件處理初濃度分別為2,000 mg-Co/L與3,000 mg-B/L的實廠廢水，結合除硼的相關文獻最終以流體化床均質顆粒化技術→化學沉澱法→鋇系化學過氧沉澱法的三步驟方式將鈷濃度處理至低於1 mg-Co/L、硼濃度低於3 mg-B/L。

Cobalt (II) is widely found in industrial effluents from such as manufacturings of lithium battery, magnetic material, alloy and catalyst. This work recovered the cobalt in the solution as basic cobalt carbonate (Co2CO3(OH)2) and cobalt oxyhydroxide pellets using a fluidized-bed homogeneous granulation process (FBHG). In the recovery of basic cobalt carbonate particle, the experiment was conducted using sodium bicarbonate as the precipitant at conditions of CCo,in = 1,000 ± 50 mg-Co/L, CO3/Co = 1.8 ± 0.2, pHe = 9.0 ± 0.2, HRT = 10.89 min, U = 38.19 m/hr, H = 60 cm. The resulted granulation ratio (GR) and total removal (TR) of cobalt could reach up to 98.2% and 98.3%, respectively. XRD and FTIR indicated that the crystal phase of the recovered pellets was Co-CO3•xCo(OH)2•yH2O. In the recovery of cobalt oxyhydroxide, sodium hypochlorite was used as an oxidant. FBHG was operated under conditions of CCo,in = 1,010 ± 20 mg-Co/L, CO3/Co = 0.90 ± 0.05、Clfree/Co = 1.05 ± 0.05, pHe = 6.7 ± 0.2, HRT = 16.3 min, U = 35.64 m/hr, H = 60 cm, the GR and TR could reach up to 92.7% and 97.2%, respectively. XRD and FTIR revealed that the particle of FBHG was CoOOH with crys-talline water. FBHG was then applied to treat a real wastewater containing cobalt and boron, which were 2000 mg/L and 3000 mg/L, respectively. Consequently, the cobalt and boron concentrations in the effluent could be less than 1 mg/L and 3 mg/L, respectively.

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