本研究以模擬的無電電鍍鎳鎳廢液為出發點，針對其中的螯合劑檸檬酸，還原劑次磷酸及重金屬成分鎳，探討其處理方法。首先嘗試利用芬頓試劑，目的在破壞螯合劑並且氧化次磷酸形成亞磷酸及磷酸，再搭配化學混凝沉澱法以去除溶液中的COD和金屬鎳離子離子離子。其最佳操作條件為pH介於2.0~4.0之間，試劑莫耳比在次磷酸：檸檬酸：Fe(II) =1：1：1.5下，可完全破壞螯合劑，釋出鎳離子，經混凝沉澱後達到99.9%的去除效率，但此時COD的去除率僅80%。原因為次磷酸在氧化後產生亞磷酸及磷酸，會與催化劑(Fe2+或 Fe3+)錯合進而使其失活，錯合後的鐵便無法有效催化雙氧水產生氫氧自由基，故溶液中會殘留大量的COD。
接著研究Electro-Fenton法氧化雙成分檸檬酸及金屬鎳離子離子離子，因芬頓法氧化方面所產生的污泥量過大，在Electro-Fenton中減少鐵的用量，其莫耳比[Fe2+]：[ Cit.]：[ Ni]：[H2O2] = 1：5：5：54的操作條件下可去除90%的COD。隨後探討pH值、電流密度、陰極構造對其系統之影響，其最佳pH值為2~3；電流密度為CDc = 190 A/m2；將陰極構造由管狀改為網狀時，由於質傳效果增加，其COD突破原先的處理極限由90%提升至95%。
　　在模擬無電電鍍鎳混合液高級氧化研究中，探討加入次磷酸後對其雙成份反應之影響。在不同次磷酸濃度加藥下，其處理結果可由Fenton
法的40% COD去除率提升至90%。由AA分析中可看見，隨著次磷酸氧化成磷酸與鐵錯合後，溶液中鐵的量隨之減少，但殘留之COD皆不變。
最後用以上獲得之加藥條件來處理無電電鍍鎳實廠廢液時，發現由於廢液中含有過多之磷酸，需將鐵催化劑的量由1100 ppm提高至3300ppm，且由硫酸亞鐵換成為硫酸鐵，其COD去除率可由80%提升至90%以上。

The primary objective of this dissertation is to study the treatment of chelate (citrate), reductant ( hyposphosphite ) and nickel ion from electroless nickel plating wastewater. The Fenton’s reagent was employed to remove COD of citrate and oxidize hypophosphite to phosphite or phosphate, then removed Nickel by chemical coagulation.
In trinary system (including hypophosphite, nickel ion and citrate), the hypophosphite could be oxidized entirely by Fenton’s reagent at pH2.0~4.0 and by the following molar ratio of dosage: hypophosphite：citrate：Fe(II) = 1：1：1.5. Only 80% COD major contributed by citrate was removed due to the iron ions are inhibited by phosphite and phosphate. On the other words, the poisoned iron ions could not catalyze H2O2 and remove COD.
In binary system (citrate and nickel ion), The Electro-Fenton was employed. Because the Fenton reaction would produce much amount of sludge, low concentration of Fe(II) was used in Electro-Fenton. The molar ratio of dosage in this stage: Fe(II)：citrate：Ni：H2O2=1：5：5：54 and about 90% COD was removed. Afterwards effect of pH on current density and configuration of cathode was discussed this system. The optimum current density is 190 A/m2 at pH 2 and 3. If we change the configuration of cathode from tube to net and the COD removal was increased from 90% to 95% due to mass transfer resistant was decreased.
In modeling electroless plating wastewater, the effect of hypophosphite on the binary system was discussed. In different hypophosphite concentration, 95% COD could be removed by electro-Fenton process, but only 20% COD was removed by Fenton process. The concentration of iron ions is decreased with reaction time because the iron ions were precipitated by oxidized phosphate. The residue COD in solution almost keep constant.
Finally, the conditions of the treatment of modeling wastewater were performed to treat practical electroless plating wastewater. The dosage of iron have to increase from 1100 ppm to 3300 ppm resulted in the large amount of phosphate. If the Fe (III) rather than Fe(II) was employed, the removal of COD would increase from 80% to 90%.

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