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首页> 外文期刊>Environmental Science & Technology: ES&T >Transport of Cryptosporidium Oocysts in Porous Media:Role of Straining and Physicochemical Filtration
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Transport of Cryptosporidium Oocysts in Porous Media:Role of Straining and Physicochemical Filtration

机译：隐孢子虫卵囊在多孔介质中的转运：过滤和理化过滤的作用

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摘要

The transport and filtration behavior of Cryptosporidium parvum oocysts in columns packed with quartz sand was systematically examined under repulsive electrostatic conditions.An increase in solution ionic strength resulted in greater oocyst deposition rates despite theoretical predictions of a significant electrostatic energy barrier to deposition.Relatively high deposition rates obtained with both oocysts and polystyrene latex particles of comparable size at low ionic strength(1 mM)suggest that a physical mechanism may play a key role in oocyst removal.Supporting experiments conducted with latex particles of varying sizes,under very low ionic strength conditions where physicochemical filtration is negligible,clearly indicated that physical straining is an important capture mechanism.The results of this study indicate that irregularity of sand grain shape(verified by SEM imaging)contributes considerably to the straining potential of the porous medium.Hence,both straining and physicochemical filtration are expected to control the removal of C.parvum oocysts in settings typical of riverbank filtration,soil infiltration,and slow sand filtration.Because classic colloid filtration theory does not account for removal by straining,these observations have important implications with respect to predictions of oocyst transport.
机译：系统地研究了小隐孢子虫卵囊在石英砂填充柱中的运输和过滤行为。溶液离子强度的增加导致更高的卵囊沉积速率，尽管理论预测沉积存在显着的静电能量障碍。在低离子强度（1 mM）下，卵囊和大小相当的聚苯乙烯乳胶颗粒获得的相对较高的沉积速率表明，物理机制可能在卵囊去除中起关键作用。在物理化学过滤可以忽略不计的极低离子强度条件下，用不同尺寸的乳胶颗粒进行的支持实验清楚地表明，物理应变是一种重要的捕获机制。本研究结果表明，砂粒形状的不规则性（通过SEM成像验证）对多孔介质的应变潜力有很大贡献。因此，在河岸过滤、土壤渗透和慢沙过滤的典型环境中，过滤和理化过滤均有望控制细小梭菌卵囊的去除。由于经典的胶体过滤理论没有考虑通过过滤去除，因此这些观察结果对卵囊转运的预测具有重要意义。

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  • 来源
    《Environmental Science & Technology: ES&T》 |2004年第22期|5932-5938|共7页
  • 作者

    Nathalie Tufenkji; Garrett F.Miller; Joseph N.Ryan;

  • 作者单位

    Department of Chemical Engineering,Environmental Engineering Program,P.O.Box 208286,Yale University,New Haven,Connecticut 06520-8286,Department of Civil,Environmental,and Architectural Engineering,University of Colorado,Boulder,Colorado 80309-0428,an;

  • 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 英语
  • 中图分类 环境化学;
  • 关键词

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