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標題: | 臭氧對含氮藥物及個人保健用品之降解與含氮產物生成影響之研究 Degradation of N-PPCPs and Formation of Nitrogen-containing Products in Aqueous Solution by Ozonation |
作者: | Shu-Hung Chou 周書弘 |
指導教授: | 蔣本基(Pen-Chi Chiang) |
關鍵字: | 臭氧,氮平衡,毒性,中間產物, Ozone,nitrogen,toxicity,intermediates, |
出版年 : | 2013 |
學位: | 碩士 |
摘要: | 近年來水污染在公共健康和環境上為大家所注重的議題。在本研究中,利用臭氧氧化去除地表水和飲用水中的含氮藥物及個人保健用品(N-PPCPs),臭氧氧化N-PPCPs的去除機制與動力學模式探討。臭氧氧化過程中轉移的各種含氮物種、中間產物以及N-PPCPs的降解後所產生的毒性亦在本研究中討論。研究結果發現臭氧氧化之快速反應大多發生在反應時間10分鐘內(第一區),而反應時間10分鐘後則呈現目標化合物進行緩慢的降解(第二區)。當SUVA值小於2 mg/L-m則樣品中含有相對少量的芳香族。N-PPCPs降解後,溶解有機氮(DON)的濃度隨著時間的推移逐漸降低,而經過反應時間30分鐘後則趨於穩定。溶解無機氮(DIN)物種(NO2-,NO3-,NH4+)濃度則隨時間的增加而上升最後趨於穩定。本研究中觀察到臭氧氧化目標化合物的去除效率順序為carbamazepine (CBZ)> diclofenac (DCF)> sulfamethoxazole (SMX)。目標化合物經過臭氧氧化後可能導致的毒性比目標化合物本身的毒性還要高。 Water pollution is one of the important public health and environmental issues. For this study, ozone has been used as an oxidant for removing N-PPCPs from surface and drinking waters. In this study, the mechanism and kinetic model in describing the removal of N-PPCPs was investigated. The shift of nitrogen species and their intermediate products by the ozonation process were also investigated. The degradation of the N-PPCPs toxicity was also investigated. The rapid reaction account for most degradation of target compounds occurring within the first ten min (Zone I), whereas insignificant degradation was observed during the slow reaction as the process passed after the 10 min (Zone II). The sample contains relatively small amount of aromatic moieties when the value of SUVA is smaller than 2 mg/L-m. In the degradation of N-PPCPs, the concentration of the dissolved organic nitrogen (DON) was gradually decreased with time into a stationary phase after 30 min reaction time, and the concentration of dissolved inorganic nitrogen DIN species (NO2-, NO3-, and NH4+) was increased with time into a stationary. From this study ,it was observed that the removal efficiency of target compounds by ozonation was in the following order : CBZ > DCF > SMX. The toxicity increase in ozonated samples due to the formation of treatment that can cause toxicity more than the parent compound has been ozonated at beginning. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/17409 |
全文授權: | 未授權 |
顯示於系所單位: | 環境工程學研究所 |
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