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首页> 外文期刊>Environmental Science & Technology >Micropollutant Degradation by the UV/H_2O_2 Process: Kinetic Comparison among Various Radiation Sources
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Micropollutant Degradation by the UV/H_2O_2 Process: Kinetic Comparison among Various Radiation Sources

机译：UV / H_2O_2工艺降解微污染物：各种辐射源的动力学比较

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Kinetic comparisons of micropollutant degradation by ultraviolet (UV) based advanced oxidation processes among various radiation sources are an important issue, yet this is still a challenge at present. This study investigated comparatively the kinetics of sulfamethazine (SMN) degradation by the UV/H2O2 process among three representative radiation sources, including low-pressure mercury UV (LPUV, monochromatic), medium-pressure mercury UV (MPUV, polychromatic), and vacuum UV(VUV)/UV (dual wavelengths causing different reaction mechanisms) lamps. Experiments were conducted with a newly developed mini-fluidic MPUV photoreaction system and a previously developed mini-fluidic VUV/UV photoreaction system. Measured and modeled results both indicate that the photon fluence-based SMN degradation rate constant (k(p)') followed a descending order of VUV/UV/H2O2 MPUV/H2O2 (200-300 nm) LPUV/H2O2, and the k(p)' of the MPUV lamp was dependent on the wavelength range selected for photon fluence calculation. Analysis of potential errors revealed that a shorter effective path-length could have a lower error, and the maximum errors for the MPUV/H2O2 and LPUV/H2O2 processes in this study were 7.7% and 18.2%, respectively. This study has developed a new method for kinetic comparisons of micropollutant degradation by UV-AOPs among various radiation sources at bench-scale, which provides useful reference to practical applications.
机译：各种辐射源之间基于紫外线（UV）的高级氧化过程对微污染物降解的动力学比较是一个重要的问题，但是目前这仍然是一个挑战。这项研究比较了三种代表性辐射源（包括低压汞UV（LPUV，单色），中压汞UV（MPUV，多色）和真空UV）通过UV / H2O2工艺对磺胺二甲嗪（SMN）降解的动力学。 （VUV）/ UV（导致不同反应机制的双波长）灯。使用新开发的微流体MPUV光反应系统和先前开发的微流体VUV / UV光反应系统进行了实验。测量和建模结果均表明，基于光子注量的SMN降解速率常数（k（p）'）遵循VUV / UV / H2O2> MPUV / H2O2（200-300 nm）> LPUV / H2O2的降序排列。 MPUV灯的k（p）'取决于为光子通量计算选择的波长范围。对潜在误差的分析表明，较短的有效光程长度可能具有较低的误差，本研究中MPUV / H2O2和LPUV / H2O2工艺的最大误差分别为7.7％和18.2％。这项研究开发了一种新的方法，用于在实验室范围内比较各种辐射源之间的UV-AOP降解微污染物的动力学，这为实际应用提供了有用的参考。

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  • 来源
    《Environmental Science & Technology》 |2019年第9期|5241-5248|共8页
  • 作者

    Li Mengkai; Li Wentao; Wen Dong; Bolton James R.; Blatchley Ernest R. III; Qiang Zhimin;

  • 作者单位

    Univ Chinese Acad Sci, Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, 18 Shuang Qing Rd, Beijing 100085, Peoples R China|Purdue Univ, Lyles Sch Civil Engn, W Lafayette, IN 47907 USA;

    Univ Chinese Acad Sci, Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, 18 Shuang Qing Rd, Beijing 100085, Peoples R China;

    Univ Chinese Acad Sci, Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, 18 Shuang Qing Rd, Beijing 100085, Peoples R China;

    Purdue Univ, Div Environm & Ecol Engn, W Lafayette, IN 47907 USA;

    Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB T6G 1H9, Canada;

    Univ Chinese Acad Sci, Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, 18 Shuang Qing Rd, Beijing 100085, Peoples R China;

  • 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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