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首页> 外文期刊>Journal of Environmental Science and Health >Online monitoring of Escherichia coli and Bacillus thuringiensis spore inactivation after advanced oxidation treatment
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Online monitoring of Escherichia coli and Bacillus thuringiensis spore inactivation after advanced oxidation treatment

机译：在线监测高级氧化处理后的大肠杆菌和苏云金芽孢杆菌孢子失活

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摘要

Various studies have shown that advanced oxidation processes (AOPs) such as UV light in combination with hydrogen peroxide is an efficient process for the removal of a large variety of emerging contaminants including microorganisms. The mechanism of destruction in the presence of hydrogen peroxide (H_2O_2) is the enhanced formation of hydroxyl (OH) radicals, which have a high oxidation potential. The goal of this study was to utilize in-line advanced oxidation to inactivate microbes, and document the inactivation via an in-line, real-time sensor. Escherichia coli cells and Bacillus thuringiensis spores were exposed to UV/H_2O_2 treatment in DI water, and the online sensor BioSentry~® was evaluated for its potential to monitor inactivation in real-time. B. thuringiensis was selected as a non-pathogenic surrogate for B. anthracis, the causative agent of anthrax and a proven biological weapon. UV radiation and UV/H_2O_2 exposure resulted in a ＞6 log_(10) reduction of the viable culturable counts of E. coli vegetative cells, and a 3 log_(10) reduction of B. thuringiensis spores. Scanning electron microscopy of the treated samples revealed severe damage on the surface of most E. coli cells, yet there was no significant change observed in the morphology of the B. thuringiensis spores. Following AOP exposure, the BioSentry sensor showed an increase in the categories of unknown, rod and spores counts, but overall, did not correspond well with viable count assays. Data from this study show that advanced oxidation processes effectively inactivate E. coli vegetative cells, but not B. thuringiensis spores, which were more resistant to AOP. Further, the BioSentry in-line sensor was not successful in documenting destruction of the microbial cells in real-time.
机译：各种研究表明，先进的氧化过程（AOP）（例如紫外线与过氧化氢结合使用）是一种有效的过程，可去除包括微生物在内的各种新兴污染物。在过氧化氢（H_2O_2）存在下的破坏机理是增强了具有高氧化电位的羟基（OH）自由基的形成。这项研究的目的是利用在线高级氧化灭活微生物，并通过在线实时传感器记录灭活情况。将大肠杆菌细胞和苏云金芽孢杆菌的孢子置于去离子水中进行UV / H_2O_2处理，并评估在线传感器BioSentry？实时监测灭活的潜力。苏云金芽孢杆菌被选作炭疽芽孢杆菌的非致病性替代物，是炭疽病的病原体和经过验证的生物武器。紫外线辐射和UV / H_2O_2暴露导致大肠杆菌营养细胞的可培养数量减少了＞ 6 log_（10），而苏云金芽孢杆菌的孢子减少了3 log_（10）。经处理的样品的扫描电子显微镜显示，大多数大肠杆菌细胞的表面受到了严重破坏，但是苏云金芽孢杆菌孢子的形态没有观察到明显变化。暴露于AOP之后，BioSentry传感器显示出未知，杆和孢子计数类别的增加，但总体而言，与可行计数测定法并不十分吻合。来自这项研究的数据表明，先进的氧化过程可以有效地灭活大肠杆菌营养细胞，但不能灭活苏云金芽孢杆菌的孢子，而苏云金芽孢杆菌的孢子对AOP的抵抗力更高。此外，BioSentry在线传感器无法实时记录微生物细胞的破坏情况。

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  • 来源
    《Journal of Environmental Science and Health》 |2014年第8期|933-939|共7页
  • 作者

    SAMENDRA P. SHERCHAN; SHANE A. SNYDER; CHARLES P. GERBA; IAN L. PEPPER;

  • 作者单位

    Department of Soil, Water, and Environmental Science, University of Arizona, Tucson, Arizona, USA,University of Arizona, Environmental Research Lab, 2601 E. Airport, Dr. Tucson, Arizona 85756, USA;

    Department of Chemical and Environmental Engineering, University of Arizona, Tucson, Arizona, USA;

    Department of Soil, Water, and Environmental Science, University of Arizona, Tucson, Arizona, USA;

    Environmental Research Laboratory, University of Arizona, Tucson, Arizona, USA;

  • 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
  • 关键词

    Advanced oxidation; water quality; drinking water; online monitoring; E. coli; Bacillus spores;

    机译：高级氧化;水质;饮用水;在线监控;大肠杆菌;芽孢杆菌;

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