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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/27007


    標題: Iron crystallization in a fluidized-bed Fenton process
    作者: Boonrattanakij, Nonglak
    Lu, Ming-Chun
    Anotai, Jin
    貢獻者: 環境資源管理系
    關鍵字: Advanced oxidation processes
    Crystallite
    Iron oxide
    Iron removal
    Nucleation
    Precipitation
    日期: 2011-05
    上傳時間: 2013-10-16 16:57:22 (UTC+8)
    出版者: Elsevier
    摘要: The mechanisms of iron precipitation and crystallization in a fluidized-bed reactor were investigated. Within the typical Fenton’s reagent dosage and pH range, ferric ions as a product from ferrous ion oxidation would be supersaturated and would subsequently precipitate out in the form of ferric hydroxide after the initiation of the Fenton reaction. These precipitates would simultaneously crystallize onto solid particles in a fluidized-bed Fenton reactor if the precipitation proceeded toward heterogeneous nucleation. The heterogeneous crystallization rate was controlled by the fluidized material type and the aging/ripening period of the crystallites. Iron crystallization onto the construction sand was faster than onto SiO2, although the iron removal efficiencies at 180 min, which was principally controlled by iron hydroxide solubility, were comparable. To achieve a high iron removal rate, fluidized materials have to be present at the beginning of the Fenton reaction. Organic intermediates that can form ferro-complexes, particularly volatile fatty acids, can significantly increase ferric ion solubility, hence reducing the crystallization performance. Therefore, the fluidized-bed Fenton process will achieve exceptional performance with respect to both organic pollutant removal and iron removal if it is operated with the goal of complete mineralization. Crystallized iron on the fluidized media could slightly retard the successive crystallization rate; thus, it is necessary to continuously replace a portion of the iron-coated bed with fresh media to maintain iron removal performance. The iron-coated construction sand also had a catalytic property, though was less than those of commercial goethite.
    關聯: Water Research, 45(10), pp.3255-3262
    Appears in Collections:[環境資源管理系(所)] 期刊論文

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