請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/5787
標題: Alachlor進行高級處理之可行性研究
Feasibility study on the advanced treatment of Alachlor
作者: 張筱薇
Chang, Hsiao-Wei
關鍵字: Alachlor
Advanced oxidation process
Activated carbon
Hydrogen peroxide
Titanium dioxide
出版社: 環境工程學系所
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摘要: 本研究嘗試以高級處理技術包含混凝膠凝、活性碳吸附、高級氧化程序(UVC/H2O2與UVA/TiO2)處理具有高毒性內分泌干擾物質Alachlor(拉草)及其可行性評估。混凝膠凝選用常用之Al2(SO4)3˙18H2O(明礬)為混凝劑行快混慢混機制;活性碳係以市售顆粒活性碳(GAC)和粉狀活性碳(PAC)進行吸附平衡反應;在高級氧化處理部分過氧化氫以較短波長之UVC光源照射,二氧化鈦光觸媒則是以UVA光源產生氫氧自由基以降解污染物。而本研究中所使用之二氧化鈦光觸媒係以溶膠凝膠法製備而成,且藉由場發射掃描式電子顯微鏡(FE-SEM)分析可知自製TiO2相較於市售TiO2具有較小之顆粒粒徑,其分別為22 nm及88 nm;以高解析X光繞射儀(HRXRD)分析可了解其存在晶型包含Anatase與Rutile兩種型態;化學分析電子能譜儀(ESCA)則可鑑定光觸媒表面為O-Ti-O (TiO2) 之方式鍵結。 本研究結果顯示,Alachlor以混凝膠凝只有約10 %去除率,沒有明顯移除效果。GAC吸附材對於Alachlor之最高吸附率可達99 %,且其符合Langmuir吸附方程式,然而GAC所需要的吸附平衡時間長達七小時;PAC在不同酸鹼溶液皆可於二小時吸附約98 %之Alachlor,並符合Freundlich多層吸附方程式。此外;利用UVC光源照射可直接光解八成之Alachlor濃度,但未能符合放流水標準,若使用UVC/H2O2處理Alachlor則能提升至99 %之效率。另一方面,Alachlor雖在光源為UVA直接光解效率不佳,但藉由光觸媒的吸附能力和光催化反應最高約有93 %的去除率,且二種光催化降解反應皆符合擬一階動力模式。 綜合本研究實驗去除成效與經濟考量,其最佳處理Alachlor之方式為高級氧化處理中之過氧化氫光催化程序。
The aim of this study is to remove alachlor, highly toxic endocrine disruptors, by advanced treatment by coagulation, activated carbon adsorption, and advanced oxidation process (UVC/H2O2 and UVA/TiO2). Therefore, explore the feasibility of advanced treatment applied to alachlor. This research used aluminum potassium sulfate dodecahydrate as coagulant. The adsorbents were two commercial activated carbons, granular activated carbon (GAC) and powdered activated carbons (PACs). Moreover, in advanced oxidation processes employ ultraviolet-C (UVC) radiation-hydrogen peroxide, and ultraviolet-A (UVA) -titanium dioxide. They strongly rely on oxidative characteristics of free-radical species such as hydroxyl radicals (HO˙) that mediate degradation or decomposition of target compounds. The TiO2 was synthesized by sol-gel method and characterized by field emission scanning electron microscope (FE-SEM), high resolution X-ray diffractometer (HRXRD), and electron spectroscope for chemical analysis (ESCA). FE-SEM results showed that TiO2 had smaller particle size than commercial TiO2 about 22 nm amd 88 nm, respectively. The crystal structures of TiO2 contains anatase and rutile. Furthermore, the surface of photocatalyst is related to O-Ti-O bonds. Only 10 % of alachlor decay in coagulation–flocculation performance. The adsorption of alachlor on GAC shows that extended Langmuir model gives a best fit with experimental observations, where the higest percentage of adsorption capacity was 99 %. However it required seven hours. On the other hand, it could be achieved about 98% of adsorption rapidly of both acid and basic solution for PAC after two hours, and equilibrium data fitted well with Freundlich model. Besides, alachlor could be degraded by more than 80% by direct photolysis. But the concentration of alachlor did not conformed to the EPA emission standard. Nevertheless the effectiveness of H2O2 addition for alachlor removal during UVC treatment was increase to 99 %. Although direct photolysis of alachlor in UVA/TiO2 system were inefficient, removal efficiency would reach about 93 % of the adsorption capacity and photocatalytic reaction by the photocatalyst. Two kinds of photocatalytic degradation reactions followed pseudo-first-order kinetic model. Summary of this study, UVC/H2O2 advanced oxidation process was the best treatment of alachlor.
URI: http://hdl.handle.net/11455/5787
其他識別: U0005-2406201314302700
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2406201314302700


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