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首页> 外文期刊>Environmental Science & Technology >Experimental Measurements of Fluence Distribution in a UV Reactor Using Fluorescent Microspheres
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Experimental Measurements of Fluence Distribution in a UV Reactor Using Fluorescent Microspheres

机译：使用荧光微球在UV反应器中注量分布的实验测量

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摘要

One concern with current techniques of UV reactor validation is that they provide only a measure of the mean UV fluence.In this research,the actual fluence distribution of a UV reactor is measured through the use of photo-chemically active fluorescent microspheres.Experimental tests were performed in a pilot-scale monochromatic UV 254 nm reactor operated at two flow rates.Analysis of the fluorescence intensity decay was performed using collimated beam experiments for determination of decay rate kinetics.A stochastic hierarchal process involving Bayesian statistics,and the Markov chain Monte Carlo integration technique was used to correlate the microsphere fluorescence intensity distribution to the UV fluence distribution.The experimental UV fluence distribution was compared with the fluence distribution predicted using a computational fluid dynamics model.The results showed that the fluorescent microspheres measured a wider distribution of UV fluences with a flow rate of 3 gpm than with 7.5 gpm.The principal differences between the modeled and the measured distribution were in the low UV fluences where the microspheres predicted lowerfluence levels than the model.The use of microspheres is demonstrated as a novel technique for measurement of the fluence distribution in UV reactors.This technique has both fundamental and practical implications for reactor evaluation and testing and could improve confidence in the future use of mathematical models for UV reactor characterization.It also serves as a complement to biodosimetry testing by providing greater insights regarding reactor behavior and validation.
机译：当前UV反应器验证技术的一个关注点是它们仅提供了平均UV能量通量的度量。在这项研究中，UV反应器的实际能量通量分布是通过使用光化学活性荧光微球来测量的。在中试规模的单色254 nm UV反应器中以两种流速运行。使用准直光束实验确定衰减速率动力学，分析荧光强度衰减。涉及贝叶斯统计和Markov链蒙特卡洛的随机分层过程使用积分技术将微球的荧光强度分布与UV能量通量分布相关联，将实验UV能量通量分布与使用计算流体力学模型预测的能量通量分布进行比较，结果表明荧光微球测得的UV能量通量分布更广流速比机智高3 gpm h 7.5 gpm。模型分布与实测分布之间的主要区别在于低UV注量，其中微球预测的通量水平低于模型。使用微球被证明是一种测量UV反应器中注量分布的新技术。该技术对反应堆的评估和测试都具有基本和实际意义，并且可以提高对未来用于UV反应堆表征的数学模型的信心，还可以通过提供有关反应堆行为和验证的更多见解来补充生物剂量学测试。

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  • 来源
    《Environmental Science & Technology》 |2005年第22期|p.8925-8930|共6页
  • 作者

    ZUZANA BOHREROVA; GIL BOHRER; S.MOHAN MOHANRAJ; JOEL DUCOSTE; KARL G.LINDEN;

  • 作者单位

    Department of Civil and Environmental Engineering,Duke University,Durham,North Carolina 27708,PolyMicrospheres,Division of Vasmo,Inc.,4101 East 30th Street,Indianapolis,Indiana 46218,and Department of Civil,Construction and Environmental Engineering,;

    Department of Civil and Environmental Engineering,Duke University,Durham,North Carolina 27708,PolyMicrospheres,Division of Vasmo,Inc.,4101 East 30th Street,Indianapolis,Indiana 46218,and Department of Civil,Construction and Environmental Engineering,;

    Department of Civil and Environmental Engineering,Duke University,Durham,North Carolina 27708,PolyMicrospheres,Division of Vasmo,Inc.,4101 East 30th Street,Indianapolis,Indiana 46218,and Department of Civil,Construction and Environmental Engineering,;

    Department of Civil and Environmental Engineering,Duke University,Durham,North Carolina 27708,PolyMicrospheres,Division of Vasmo,Inc.,4101 East 30th Street,Indianapolis,Indiana 46218,and Department of Civil,Construction and Environmental Engineering,;

    Department of Civil and Environmental Engineering,Duke University,Durham,North Carolina 27708,PolyMicrospheres,Division of Vasmo,Inc.,4101 East 30th Street,Indianapolis,Indiana 46218,and Department of Civil,Construction and Environmental Engineering,;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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