邱桂英-光催化反應處理水中背景有機物之研究
Photocatalytic Degradation of The Background Organic Matter in Drinking Water
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本研究嘗試以光催化反應來氧化分解水中有機物,同時評估於不同條件下,如於腐植酸水溶液中加入催化劑、加入NaHCO3模擬水中鹼度或以特級空氣或氮氣曝氣處理等,UV對水體中背景有機物之氧化分解效果,並尋求反應系統中較適合之催化劑濃度。實驗所使用之水樣為人工配置之腐植酸溶液,於不同條件下照射紫外燈後,以紫外光-可見光光譜分析儀分析水樣之有機物含量。同時使用不同材質之燈罩(石英、鉀玻璃或鈉玻璃)進行照光實驗,以比較各種材質之燈罩對紫外燈照射處理水中有機物之效果。
實驗結果顯示,在水樣所含有機物濃度介於3∼10 mg/L(以NPOC表示)時,H2O2催化劑較佳之添加濃度係介於0.3∼0.6%,而TiO2的加入在本實驗結果中對水中有機物之處理亦具有相當的效果。鹼度的存在於有機物的處理效果上,可能產生負面的影響。在燈罩材質的實驗結果比較中,以使用石英燈罩的實驗組處理效果最佳,使用鉀燈罩者次之,以使用鈉玻璃燈罩者之處理效果較不明顯。整體而言,光催化水中背景有機物之效果受到燈罩材質、照光反應時間、添加催化劑的量、催化劑之種類、水樣中有機物之初始濃度、鹼度及溶氧的高低等因素的影響。
Abstract
This study evaluates the applicability of advanced oxidation method (UV/H2O2 and UV/TiO2) to control the natural organic matter (NOM) in drinking water. Factors considered includes the concentrations of!NOM, presence of alkalinity and dissolved oxygen in water. Different kinds of glass media (quartz and pyrex glass) were used to control the penetration of the UV lights with different wavelength.The results indicated that the addition of 0.6% H2O2 give the best results to reduce the NOM concentration in water. Addition of TiO2 will also helpful in reducing the NOM concentration. The presence of alkalinity may interfere the penetration of the UV light, hence affect the effect of the UV oxidation process. Quartz filter is the best media in this study for the control of the NOM, use of the pyrex glass or other glass as the filter may stop the penetration of the low wavelength UV light and so reduce its oxidation ability for NOM.