在各種整治受污染場址方法中，吸附劑透水性處理牆與現地化學氧化是兩種常被探討之整治技術，本研究探討該兩種技術合併使用時之特性。研究中首先探討活性碳對臭氧氫氧自由基轉換率之影響，然後應用臭氧氧化再生活性碳時，其污染物甲基第三丁基醚(methyl tert-butyl ether, MTBE)之去除，最後並探討活性碳吸附MTBE之等溫吸附量的關係以及活性碳的再生效能，以期作為技術應用之可行性依據。

研究結果顯示，隨著臭氧濃度提高以及pH升高，其臭氧轉換氫氧自由基的轉換率Rct值越大，臭氧濃度在1.4 - 4.3 mg/L、pH=5.3 下，Rct值介於5.3 - 9.5×10-10，當pH為6.7時，Rct值則增為2.6 - 16.8×10-9。臭氧與MTBE連續曝氣反應，可以分成揮發與氧化降解兩部分，前者可以用一階降解模擬，速率常數為0.014 min-1；後者則可以用二階降解模擬，速率常數為0.00986 L-mg-1-min-1。臭氧氧化活性碳再生實驗顯示，水中殘餘MTBE及其副產物均非常低，顯示臭氧能有效氧化由吸附劑中釋出之MTBE。活性碳經由臭氧氧化一次後再生吸附量為原先之75%，第二及三次後再生吸附量均為50%，顯示以臭氧進行化學氧化再生活性碳時，可以有效增加原先已經飽和之吸附量，提升吸附劑再使用效率。

Adsorbent based permeable reactive barrier and ozonation are two common methods used in in-situ remediation for organic contaminants. This study is aimed to understand the feasibility of combining the two methods in treating methyl tert-butyl ether (MTBE). Effect of activated carbon (AC) on the formation free radicals during ozonation was first examined. Then, chemical regeneration of MTBE-saturated AC using ozonation was investigated. Finally, the adsorption capacity of MTBE on AC was determined before and after regeneration.

Experimental results show that ozone hydroxyl radical transformation ratio (Rct) increased with increasing ozone concentration and increasing pH. At ozone concentration between 1.4 - 4.3 mg/L, Rct was 5.3 - 9.5×10-10 and 2.6 - 16.8×10-9 for solution pH controlled at 5.3 and 6.7, respectively. The loss of MTBE during ozonation can be divided into two processes, volatilization and destruction. The former one may be simulated by a first-order loss process, with rate constant = 0.014 min-1, while the latter one may be described by a second-order reaction, with rate constant = 0.00986 L-mg-1-min-1. An additional 75%, 50%, and 50% of adsorption capacity was created for the saturated AC, after 1, 2, and 3 times of ozonation regeneration. In addition, only trace concentration of MTBE and its byproducts were detected in the water, suggesting that ozone can not only regenerate the saturated AC but also can properly destruct MTBE. This finding may suggest that ozonation may increase the adsorption capacity of saturated AC, and combination of the two techniques may be worth to explore further for in-situ remediation.

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