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研究生:鄭潔虹
論文名稱:水質參數對臭氧消毒副產物生成影響之研究
指導教授:葉宣顯
學位類別:碩士
校院名稱:國立成功大學
系所名稱:環境工程與科學系
學門:工程學門
學類:環境工程學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:115
中文關鍵詞:臭氧溶解性有機物溴酸鹽
外文關鍵詞:OzoneDissolved organicsBromate
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  本研究在探討水中各類溶解性有機物之存在,對臭氧氧化含溴離子原水,生成溴酸鹽(BrO3)及其他溴化在機物之影響。同時藉由改變PH值、溴離子濃度及鹼度等水質參數,探討臭氧化過程中水質因子對溴酸鹽(BrO3)、溴化有機物生成之影響程度。實驗上係以將自原水萃取出之各類有機物,配製人工原水方法,並探制各水質參數,進行半批分式臭氧氧化試驗。
  實驗結果顯示,在中性PH值及低鹼度下含fulvic acid 之人工原水臭氧化生成之BrO3最高,humic acid 及hydrophobic neutral 次之,hydrophilic neutral 最低。提高各類人工原水之PH值,BrO3生成量均有增加趨勢,顯示氫氧自由基對於BrO3生成佔在相當重要的地位。而提高咸鹼度也會使BrO3生成量增加,其中以含hydrophilic neutral 者最為顯著,這是因為水中屬小分子親水中性之hydrophilic neutral 類有機物,所含之部份物種(例如ethanol、oxalate及glucose等)是氫氧自由基之抑制者(Inhibitor),但其不能消除由鹼度而產生的CO30自由基,故hydrophilic neutral 對鹼度之增加最為敏感。
  各類人工原水臭氧化後溴化有機物之生成趨勢,與BrO3恰有相反趨勢,fulvic acid 及humic acid 在本實驗所控制的水質條件下,生成之溴仿濃度甚低。hydrophilic neutral 則約有10~20□g/L生成量,並隨著水中Br濃度增加而增加。但提高pH值或鹼度則生成量明顯下降或不生成。
  This research studied the effect of types of dissolved organics on the formation of bromate and brominated orgaics during ozonation of bromide containing natural water. Further, the effects of pH value, alkalinity, and bromide concentration were also studied. Dissalved organic fractions extracted from source water were used separately to prepare synthetical water with specific Br- concentration and other water quality parameters. Then the synthetical waters were ozonated under several dosages, and bromater, NPDOC, and other water quality parameters measured.
  The results show that, in netural pH amd low alkalinity systems, synthetic water containing fulvic acid formed the highest concentration of BrO3-, followed by humic acid and hydriohobic neutral, while hydrophilic neutral the lowest. The higher hte pH value was, the higher the bromate formed. This indicates that hydroxyl radical mechanism probably played an important role in the formation of BrO3-. Increasing alkalinity also induced higher bromate formation. And this phenomenum was more significant for synthetic water containing hydrophilic neutral organics. This can be explained by the existance of lower molemlar organics. This can be explained by the existance of lower molemlar organics contained in the hydrophilic neutral fraction, such as ethanol, oxalate, and glucose, which may scavenge hydoxyl radicals. However, the CO30- radical fromed from alkalinity can not be scavenged by these organics. therefore, hydrophilic neutral was more sensitive to the increase of alkalinity.
  However, the trend for the formation of brominated organics was opposite to that for the formation of bromate. Under the experimental conditions of this study, the bromoform produced from synthetic waters containing fulvic acid and numic aicd was very low while the bromoform producd from hydrophilic neutral was about 10~20ug/L , and increased with increasing Br concentration. And higher pH alkalinity depressed the formation of bromoform.
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