離島地區的自來水問題常較台灣本島來得嚴重，主要原因為海水入侵以及有機物濃度較高，造成TDS、三鹵甲烷過高，此外還有紅水等問題，導致居民經常抱怨。有鑑於此，當地自來水廠有意興建高級淨水處理廠，其中可能包括GAC單元。一般在GAC單元之前會先經臭氧前處理，以避免GAC再生頻率過高，導致成本升高。以金門原水為例，若採用臭氧為其前處理，因為海水入侵之關係，可能原水中之溴離子(Br-)含量較高，則擔心會有過量之溴酸鹽生成問題，而溴酸鹽已知對人體有致癌性之危險，並且在國內對臭氧處理水已訂有溴酸鹽之標準。
本研究則是以澳洲所研發之MIEX有機物交換樹脂來做為臭氧前的處理，以金門原水與腐植酸配製之人工原水兩部分進行，觀察這兩種原水在經過臭氧處理後，溴酸根離子(BrO3-)之生成情形，以及MIEX前處理程序能否有效解決溴酸根的問題。
實驗結果顯示MIEX有機物交換樹脂在對人工原水或金門原水都有良好的有機物去除率，經過MIEX處理之後，水體的臭氧需求量也都有所下降，可以有效節省在淨水過程中的臭氧加量。在溴酸根離子部分，人工原水直接經過臭氧處理，所生成之溴酸根離子濃度高達近350μg/L，在經過MIEX處理之後，大幅下降到只剩未到150μg/L，去除能力良好。在金門原水部分，原水直接經過臭氧處理僅有約50μg/L的溴酸根離子生成，但仍超出法定標準之10μg/L，經過MIEX前處理程序之後，則其經臭氧後出水並未被儀器偵測到有溴酸根離子的生成(方法偵測極限為4μg/L)。故以MIEX有機物交換樹脂為淨水程序之前處理，可以有效抑制金門原水及人工原水臭氧處理單元中溴酸根離子之生成。

The public water supplies of off-shore island of Taiwan encounter several problems, including salt water intrusion, high dissolved organic content in source water, high THM and red water in the distribution system. In order to abate these problems, the Water Works are contemplating upgrading the existing facilities. Including GAC filter is one of the options. Now, the dilemma is with only GAC, the regeneration frequency of GAC bed will be quite high, and, therefore, high costs. If GAC bed is preceded by ozonation, the regeneration frequency can be reduced, but there may be bromate problem, as there is high bromide concentration in the source water. Bromate is a suspected carcinogen, and local drinking water quality standards have set a limit for it.

As the Magnetic Ion Exchange Resin (MIEX) is able to remove both dissolved organic and bromide from water, in this study the MIEX was used as pretreatment of ozonation to see its effect on bormate and THM control. Both synthetic source water, which contained humic acid as model organic compound, and field source water from Kinmen Water Works were investigated.

The results show that MIEX has high NPDOC removal for both synthetic and field source waters. MIEX pretreatment also significantly reduced the ozone demand of the source waters. For bromate control, when the synthetic water was directly ozonated, the concentration of bromate formed was as high as 350 μg/L. However, the bromate concentration can be dropped to about 150 μg/L, if ozonation was preceded by MIEX. For field source water, the bormate concentration from direct ozonation was about 50 μg/L, still higher than that allows by local drinking water standards, which is 10 μg/L. With MIEX pretreatment, the bromate concentration of the ozonated water was lower than the detection limit of the instrument (MDL 4 μg/L). Therefore, MIEX pretreatment is effective for controlling bromate formation form ozonation of both synthetic source water and real Kinmenwater.

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