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首页> 外文期刊>Environmental Science & Technology >Removal of E coli from Water Using Surface-Modified Activated Carbon Filter Media and Its Performance over an Extended Use
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Removal of E coli from Water Using Surface-Modified Activated Carbon Filter Media and Its Performance over an Extended Use

机译：使用表面改性的活性炭滤料从水中去除大肠杆菌及其在长期使用中的性能

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摘要

Modification of activated carbon (AC)by aluminum hydroxychloride (AHC),and diatomaceous earth by zinc hydroxide changed the zeta potentials of these filter media from negative to positive.The modification method is amenable to room temperature,and eliminates the essential requirement of strong base treatment for making metal hydroxide coated filter media.Solid-state MAS 27AI NMR spectra suggested the presence of AI13-mer in the AHC-treated AC.AHC-modified AC samples were further treated with silver halide,and two antibacterial compounds to prevent microbial growth on filter media.In situ precipitation of silver bromide on AC resulted in formation of nanosized AgBr crystals.Bacteria removal performances of the modified media were tested in columns.For the first time,we demonstrated that only 30 g of either AHC-treated AC (60 x 200 mesh)or nano AgBr supported AC could provide >6 log E coli removal over approx 1000 L when the input water had a bacterial load of 10~7 CFU/mL The filter media were robust enough to perform even when water was passed at superficial velocities 3-10 times the typical velocity (6 cm/min)of water treatment processes.Metal leaching from the modified media was found to be less than the USEPA specified Maximum Contaminant Level.
机译：羟基氯化铝（AHC）改性活性炭（AC），氢氧化锌改性硅藻土将这些过滤介质的Zeta电位从负变为正。该改性方法适用于室温，消除了对强碱的基本要求固态MAS 27AI NMR光谱表明AHC处理过的AC中存在AI13-mer.AHC改性的AC样品进一步用卤化银和两种抗菌化合物处理以防止微生物生长溴化银在AC上原位沉淀导致形成纳米级AgBr晶体。在柱上测试了改性介质的细菌去除性能。首次，我们证明了经AHC处理的AC（仅30 g（当输入水的细菌载量为10〜7 CFU / mL时，约60 L（200 x 60目）或纳米AgBr支持的AC可以在大约1000 L内提供> 6 log E.即使当水以表观速度通过水处理过程的典型速度（6 cm / min）的3-10倍时，a也足够坚固。发现从改性介质中浸出的金属少于USEPA指定的最大污染物水平。

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  • 来源
    《Environmental Science & Technology》 |2006年第19期|p.6091-6097|共7页
  • 作者

    SUKDEB PAL; J.JOARDAR; JOONMYONG SONG;

  • 作者单位

    Research Institute of Pharmaceutical Sciences and College of Pharmacy,and School of Materials Science & Engineering,Seoul National University,Seoul 151-742,South Korea;

  • 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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