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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/30770

    標題: 以流體化床芬頓程序對去除益達胺操作參數的影響
    作者: 邱鈺云
    貢獻者: 環境資源管理系
    關鍵字: 益達胺
    Refractory pollutant
    Hydroxyl radicals
    Fenton reagent
    日期: 2017
    上傳時間: 2018-01-11 11:42:50 (UTC+8)
    摘要: 益達胺(Imidacloprid, IMD)是一種廣泛運用於農業與住宅物業之新型殺蟲劑。含有益達胺之廢水可能會傷害人類與水生生物。本研究採用流體化床芬頓法去除益達胺,主要是因為其成本低、操作簡單且無毒無害。在具有合成廢水實驗室規模的反應器中研究益達胺的降解。在研究條件為pH3、Fe2+ 1.0-10.0mM、H2O2 1.0-20.0mM、益達胺1.0mM以及SiO2 100g之情況下。發現Fe2+與H2O2之比值是IMD降解中之顯著性操作因素,其最佳比例為3:5。增加H2O2之濃度可以改善益達胺降解;然而,過量的H2O2會導致清除效應並降低益達胺之降解。當初始Fe2+濃度增加時,IMD與H2O2的降解效率會迅速增加。在本研究中使用之所有Fe2+劑量中未觀察到清除OH˙對Fe2+濃度之負面影響。在適當之條件下,益達胺之降解效率為97.07%、COD為41.38%、TOC為12.04%,而去除效率按照以下順序:反應時間45分鐘內可得到結果IMD> COD> TOC。通過流體化床芬頓法之益達胺降解總動力學方程可以描述為:
    (d[IMD])/dt =〖-0.2323〖H_2 O_2]〗^0.1065 [〖Fe〗^(2+)]〗^0.3618 增加流體化床膨脹,在Fe2+去除和益達胺降解中沒有顯著差異,但在還原氫氧化鐵污泥時對鐵有影響。
    Imidacloprid (IMD) is a new type of the insecticides widely used in agriculture and residential properties. Wastewater containing IMD can harm human and aquatic lives. This study applied the fluidized-bed Fenton process to remove IMD because of its low capital cost, easy operating, non-toxic by products. Degradation of IMD was investigated in a lab-scale reactor with synthetic wastewater. Studied conditions were pH 3, 1.0-10.0mM of Fe2+, 1.0-20.0mM of H2O2, 1.0mM of IMD, and 100g SiO2. It was found that the Fe2+:H2O2 ratio was a significant operating factor on IMD degradation and the optimum ratio was 3:5. Increasing H2O2 concentration could improve IMD degradation; however, excessive H2O2 caused scavenging effects and decreased IMD degradation as a consequence. When the initial Fe2+ concentration increased, the IMD and H2O2 degradation efficiency also increased rapidly. Scavenging of OH•, which is indicated by a negative effect of Fe2+ concentration, was not observed in all the Fe2+ dosages used in this study. Under the appropriate conditions, the degradation efficiency of IMD of 97.07% IMD, 41.38% COD and 12.04% TOC, while the removal efficiencies were in the following order: IMD > COD > TOC could be obtained in 45 minutes of the reaction time. Overall kinetic equation for IMD degradation by fluidized-bed Fenton process can be dedcribed as:
    (d[IMD])/dt = 〖-0.2323〖 [H_2 O_2]〗^0.1065 [〖Fe〗^(2+)]〗^0.3618 Increasing bed expansion did not a significant difference in Fe2+ removal and IMD degradation but have an effect on iron while it reducing ferric hydroxide sludge.
    關聯: 電子全文公開日期:2019-06-27,學年度:105,96頁
    Appears in Collections:[環境資源管理系(所)] 博碩士論文

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