以萃取-臭氧化系統處理水溶液中2，4-二氯酚反應行為之研究

Abstract

本研究為一嶄新之廢水處理單元，各單元之功用如下﹕(1)設計一萃取單元，使有機廢水與溶劑在此單元接燭，藉由萃取作用使有機污染物由水相進入溶劑相中，以降低廢水中有機物濃度﹔(2)設計一臭氧化單元，連結前述之萃取單元，溶劑中之有機污染物在此單元中分解氧化，因而恢復溶劑之萃取能力，達到溶劑再利用之功效﹔(3)設計一溶劑循環迴路，使有機污染物重覆進行萃取與臭氧化作用，達到去除廢水中有機污染物之功效。 關於影響此萃取-臭氧化處理系統效率之相關因子，已於去年利用L27直交表實驗研究發表。在本研究中，處理系統中各反應單元及整個萃取-臭氧化處理系統之反應動力模式已被發展來預測相關因子對污染物去除效率之影響。此外，針對半批次攪拌反應槽中，臭氧在低pH值水溶液與氟化烴溶劑(FC77)中之質傳係數與攪拌速率及臭氧進流流率的關係，亦經由實驗求得。而2，4-二氯酚臭氧化之初期中間產物，則利用衍生化技術及GC/MASS分析鑑定得知，並推估其反應機制。

An innovative extraction-ozonation process was developed and studied for degradation of phenolic pollutants in water. The inuniscible, inert and highly ozone soluble fluorinated solvent (FC77) was used as the roles of not only the extractant to remove pollutants from water but also the oxidation medium in which ozone was intrduce to degrade polutants. A solvent circulation, system was also designed for reusing the fluorinated solvent. The significant factors and the optimal combination of this process parameters were determinated and established with Taguchi L27 method last year. In this study, the kinetics of this extraction-ozonation process was developed to describle and predict the variation of 2,4-dichlophenol in each unit of this proceess. The equations between overal ozone mass tranfer coefficient and corresponding factors in semi-stured reactor were also established by experiments. Otherwise, the most important findings of this study is the identification of the hydrolated intermediates by GC/MASS and determination of the inital reaction pathway between ozone and 2,4-dichlorophenol .