台灣離島之金門、澎湖等地區部分淨水廠之原水含有高量之有機物質，原水中存在過量有機物時，可能與淨水處理程序中所加入之氯反應生成三鹵甲烷等類消毒副產物(DBP)。為解決此一問題，水廠把加氯點往處理程序之後端移動，減少氯與前質接觸時間，以解決THM問題，但卻可能因為氯與鐵接觸時間不足，而引發紅水現象。可能之原因為有機物與鐵離子錯合，降低淨水程序對鐵之去除效率。本研究係以對去除溶解性有機物有極高處理效率之磁性離子交換樹脂MIEX為研究對象，探討其對有機物錯合鐵之去除情形。
首先比較火焰原子吸收光譜儀(AA)及比色法對鐵之偵測，結果顯示比色法須在實驗室進行加酸加熱之前處理才能測得總鐵含量，且AA偵測出來的數據較接近實際值，故後續實驗皆以AA偵測水中溶解性鐵量。
水楊酸為一含羧基與羥基之簡單有機物，可與過渡金屬鐵錯合，且錯合後會呈現紫色。首先以XAD-2樹脂證實水楊酸錯合鐵原水中，AA所測得的溶解性鐵裡錯合鐵所佔之比例。後續探討pH值、水楊酸濃度與Fe+3濃度對水楊酸錯合鐵生成量之影響。結果顯示pH 4下，水楊酸與鐵的錯合飽和量應約為水楊酸：鐵 = 2：1 之比例。pH超過5以後鐵幾乎全部形成Fe(OH)3(s)沉澱，而pH低於4，水樣中的錯合鐵佔溶解性鐵的比例會逐漸降低，且實測結果與以錯合常數及matlab計算所得之理論值相當接近。
MIEX會隨濃度或pH值的變化而對水楊酸有不同的去除效果，故研究中控制不同pH 值(2、3、4、5、6、7) 及MIEX劑量（2 ml/L、4 ml/L、6 ml/L、8 ml/L、10 ml/L）來探討不同實驗參數對去除率之影響。去除效率隨MIEX劑量而增加，MIEX劑量10 ml/L 時可達14.58%左右。pH值越低則去除效果越差，小於pH 2時，去除率相當低，此乃因水楊酸在低pH值時，官能基未解離而不帶負電，因而無法與MIEX進行陰離子交換，而達到去除之目的。接下來以MIEX去除與鐵錯合之水楊酸，發現MIEX不僅可去除水楊酸，在此同時也可一併去除與水楊酸錯合之鐵。且水楊酸有無與鐵錯合，並不影響MIEX對其之去除率。
進一步延伸到腐植酸與腐植酸錯合鐵，實驗方式與水楊酸相同，但發現MIEX對腐植酸的去除率在加藥量同樣為10 ml/L下，卻有接近50%的去除率，推測這是因為MIEX對腐植酸之去除，除了依靠離子交換反應，也會由凡得瓦爾力的吸附而去除。而在去除腐植酸錯合鐵方面，MIEX對與腐植酸錯合之鐵一樣可達到去除效果，且腐植酸與鐵錯合與否，亦不影響MIEX對腐植酸的去除。

The amount of organic matters in some of the source water for public water supply is significant in the offshore islands of Taiwan, such as Kinmen and Penghu. An excess of organic contaminants will cause the formation of disinfection by-products (DBPs) through reacting with chlorine in the water treatment process. In order to inhibit the generation of THMs, some water treatment plants avoid prechlorination to reduce the contact time between chlorine and precursors. However, it may cause the red water problem owing to the low efficiency of iron removal. A possible reason is that the iron is in organic complexed form, which is difficult to remove if the reaction between chlorine and organic complexed iron is insufficient. This research focuses on the removal efficiency of organic complexed iron by magnetic ions exchange resin (MIEX), which is mainly for NOM(natural organic matter) removal.
Iron can be analyzed by both flame atomic absorption spectrometry (AA) and spectrophotometer.However, the results show that pretreatment is necessary for the latter and the data obtained by AA is closer to the real value. Therefore, most of the dissolved iron measurement in this study was conducted by AA.
Salicylic acid is a simple organic compound, which contains carboxyl and hydroxyl groups; and it may react with transition metal iron to form complex with purple color. XAD-2 resin was need to confirm the ratio of salicylic acid complexed iron in the raw water. Then the effect of pH value, the concentration of salicylic acid, and ferric ion on the amount of complexed iron was stadied.The results show that the ratio of salicylic acid and iron in the complex was 2:1 at pH 4. When pH value was greater than 5, almost all iron turned into ferric hydroxide precipitate. Under pH4, the ratio of complexed iron and total dissolve iron decreased with the pH value, and the results from chemical analysis were near to the theoretical value calculated by Matlab.
The removal efficiency of salicylic acid by MIEX might be affected by concentration and pH value. Therefore, the removal efficiency under different pH (2~7) and MIEX dosage (2ml/L~10ml/L) was investigated.The results show the removal efficiency increase with MIEX dosage. It can be up to about 14.58% at 10 ml/L MIEX dosage. The removal efficiency decreased with pH value, was quite low under pH 2.The explanation is:as the pKa1 of salicylic acid is 2.81, so the functional groups would not ionize and be unable to proceed ions exchange with MIEX. Then MIEX was need to remove salicylic acid which complex with iron, and found that MIEX can remove both free and iron-complexed salicylic acids. The removal efficiency of salicylic acid would not be affected by the existence of iron.
Finally, the removal of humic acid and himic acid complexed iron by MIEX was also studied. The removal efficiency of humic acid by MIEX was about 50% higher than that of salicylic acid, at dosage 10ml/L. Proobably because the removal of humic acid was by absorption on to MIEX dose to van der Waals force as well as ions exchange reaction. MIEX can remove iron which was complexed with humic acid. The removal efficiency of humic acid was also not be affected by the existence of iron.

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