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首页> 外文期刊>Environmental Science & Technology >Reactivity of Effluent Organic Matter (EfOM) with Hydroxyi Radical as a Function of Molecular Weight
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Reactivity of Effluent Organic Matter (EfOM) with Hydroxyi Radical as a Function of Molecular Weight

机译：污水中有机物（EfOM）与羟基自由基的反应性是分子量的函数

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The application of advanced oxidation processes (AOPs) for the treatment of wastewater is hindered by scavenging of the hydroxyi radical (HO·) by effluent organic matter (EfOM). This scavenging is directly proportional to the second-order reaction rate constant between EfOM and HO· (K_(EfOM-HO·). To understand the kinetics of this reaction as a function of the subcomponents of EfOM, four wastewater samples were fractionated by urtrafirtration into distinct apparent molecular weight (AMW) fractions (<1, <3, <5, and <10 kDa), and their K_(EfOM-HO·) values were quantified. In general, the values for K_(EfOM-HO·)decreased as the AMW increased. The values of K_(EfOM-HO)·for the bulk waters varied between 6.32 and 14.1 × 10~8 M_c-~(1)s ~(-1) (units of per molar carbon concentration per second). In the case of the <1 kDa fraction, the values of K_(EfOM-HO·) varied from 14.3 to 35.0 × 10~8 Mr~(-1) s~(-1), or approximately 2.31(±0.24) times that of the corresponding bulk waters. For the <3 kDa, <5 kDa, and <10 kDa fractions, the K(EfOM-HO)· values were 1.83(±0.25), 1.32(±0.23), and 1.26(±0.35) times that of the bulk waters, respectively. Based on the obtained results, the variability and general magnitude of the K(EfOM-HO)· values were attributed to the production and reactivity of soluble microbial products (SMP), a major component of EfOM. Two samples collected atawastewatertreatment facility with different treatment variables had different K_(EfOM-HO)· values, indicating that wastewater treatment processes will impact overall HO· scavenging by EfOM and should be considered during the implementation of AOPs.
机译：废水中有机物（EfOM）对羟基自由基（HO·）的清除阻碍了先进氧化工艺（AOPs）在废水处理中的应用。这种清除作用与EfOM和HO·（K_（EfOM-HO·））之间的二阶反应速率常数成正比。为了了解该反应动力学与EfOM子组分的关系，通过超滤对四个废水样品进行了分级分离。分为明显的表观分子量（AMW）分数（<1，<3，<5和<10 kDa），并量化其K_（EfOM-HO·）值。随AMW的增加而降低。散水的K_（EfOM-HO）·值在6.32和14.1×10〜8 M_c-〜（1）s〜（-1）之间变化（每摩尔碳原子浓度的单位在<1 kDa分数的情况下，K_（EfOM-HO·）的值从14.3变为35.0×10〜8 Mr〜（-1）s〜（-1），大约为2.31（± 0.24）倍于相应的散装水，对于<3 kDa，<5 kDa和<10 kDa的馏分，K（EfOM-HO）·值分别为1.83（±0.25），1.32（±0.23）和1.26 （±0.35）倍于散装水的倍数。获得的结果，K（EfOM-HO）·值的变异性和一般大小归因于EfOM的主要成分可溶性微生物产物（SMP）的产生和反应性。在不同处理变量的awawastewater污水处理厂收集的两个样品具有不同的K_（EfOM-HO）·值，这表明废水处理过程将影响EfOM对整体HO·的清除，在实施AOP时应予以考虑。

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  • 来源
    《Environmental Science & Technology》 |2010年第15期|p.5714-5720|共7页
  • 作者

    MEI MEI DONG; rnSTEPHEN P. MEZYK; rnFERNANDO L. ROSARIO-ORTIZ;

  • 作者单位

    Department of Civil, Environmental and Architectural Engineering, 428 UCB, University of Colorado at Boulder,Boulder, Colorado 80309;

    rnDepartment of Chemistry and Biochemistry, California State University at Long Beach,1250 Bellflower Boulevard, Long Beach, California 90840;

    rnDepartment of Civil, Environmental and Architectural Engineering, 428 UCB, University of Colorado at Boulder,Boulder, Colorado 80309;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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