在受污染場址的各種整治方中，吸附劑透水性處理牆與現地化學氧化是兩種常被探討的整治技術之ㄧ，當共同應用於處理時，可以將污染物濃縮後再由氧化劑進行降解，並再生吸附劑以延長處理年限。此項技術被應用於水處理程序中，但是在收污染場址整治則尚未有相關研究，本研究擬結合此兩種技術，探討處理常於汽油污染場址中發現之污染物甲基第三丁基醚(methyl tert-butyl ether, MTBE)之可行性。研究中利用化學氧化再生技術處理吸附飽和之活性碳，探討活性碳吸附量的改變情形，並分析反應過程中污染物之副產物的生成，期對將來運用於現地處理技術之可行性與作為經濟方面之考量依據。實驗結果顯示，活性碳的氧化劑需求量約為2.25 g-oxidant / g-G340，且MTBE的降解動力可以假ㄧ階反應動力進行描述，其所求得之反應速率常數約為7.9×10-6 s-1 (pH = 3~3.5，25℃)。MTBE之副產物分析結果發現，反應初期的副產物主要為TBA，其次為TBF、acetone，隨著反應時間增長，TBA與TBF則逐漸降解為acetone。此外，氧化再生實驗結果發現，經氧化吸附飽和之活性碳後，其飽和吸附量仍有90 %以上，顯示若將來欲以過硫酸鹽進行化學氧化再生技術之運用時，再生吸附劑 (活性碳) 所須支出之成本將可大為降低，即活性碳之再生效率與氧化劑的選用等實用性與經濟性的考量方面，本研究方可作為整治技術之參考依據。

The gasoline additive, methyl tert-butyl ether (MTBE), could be found in many underground environment recently. In many of the remediation techniques, adsorbent-based permeable reactive barrier (PRB) and in-situ chemical oxidation (ISCO) are widely investigated. When PRB and ISCO were employed simultaneously, the oxidant could degrade the adsorbed pollutants more efficiently due to the concentration nature of the adsorption process. In addition, the oxidant could also regenerate the adsorbent to extend the lifespan of the adsorbent. Therefore, this study attempted to apply the chemical oxidative regenerated technology to treat the pollutant (MTBE) and to evaluate the practicability of combining in-situ oxidation and adsorption processes for the treatment of MTBE. In this study, persulfate and a commercially available activated carbon (AC) were used as an oxidant and an adsorbent, respectively. After MTBE was adsorbed to AC, the adsorption capacity of AC and the variation of byproducts of MTBE were studied during oxidation/regeneration and re-adsorption process. The experimental results show that the concentration of persulfate has to exceed a persulfate-to-AC ratio of 2.25 g/g to produce an efficient oxidation to remove the sorbed MTBE. The batch experiment results indicate that a pseudo-first-order reaction model can adequately describe the MTBE oxidation kinetics by persulfate. Besides, the major byproducts found in the oxidation process were tert-butyl alcohol (TBA), tert-butyl formate (TBF) and acetone. As the reaction time increased, the concentrations of the byproducts increased accordingly.

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