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Riverbank Filtration: Comparison Of Pilot Scale Transport With Theory

机译：河岸过滤：中试规模运输与理论的比较

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摘要

Pilot-scale column experiments were conducted in this study using natural soil and river water from Ohio river to assess the removal of microbes of size ranging over 2 orders of magnitude, i.e., viruses (0.025-0.065 um), bacteria (1-2 /urn), and Cryptosporidium pan/urn oocysts (4-7 im) under conditions representing normal operation and flood scour events. Among these different organisms, the bacterial indicators were transported over the longest distances and highest concentrations; whereas much greater retention was observed for smaller (i.e., viral indicators) and larger (i.e., Cryptosporidium parvum oocysts) microbes. These results are in qualitative agreement with colloid filtration theory (CFT) which predicts the least removal for micrometer size colloids, suggesting that the respective sizes of the organisms was a dominant control on their transport despite expected differences in their surface characteristics. Increased fluid velocity coupled with decreased ionic strength (representative of major flood events) decreased colloid retention, also in qualitative agreement with CFT. The retention of organisms occurred disproportionately near the source relative to the log-linear expectations of CFT, and this was true both in the presence and absence of a colmation zone, suggesting that microbial removal by the RBF system is not necessarily vulnerable to flood scour of the colmation zone.
机译：在这项研究中，使用俄亥俄州河的天然土壤和河水进行了中试柱实验，以评估微生物大小超过2个数量级的微生物（例如病毒（0.025-0.065 um），细菌（1-2 / ur和隐孢子虫泛/ ur卵囊（4-7 im），它们代表正常运行和洪水冲刷事件。在这些不同的生物中，细菌指示剂的运输距离最长，浓度最高。而对于较小的微生物（即病毒指标）和较大的微生物（即小隐孢子虫卵囊），则观察到更大的保留。这些结果与胶体过滤理论（CFT）的定性一致，胶体过滤理论预测了微米级胶体的去除最少，这表明尽管其表面特性存在预期差异，但生物体的各自大小仍是其运输的主要控制因素。流体速度的提高与离子强度的降低（代表主要的洪水事件）降低了胶体的保留，这在质量上与CFT一致。相对于CFT的对数线性期望，生物的滞留在源头附近成比例地发生，并且在存在和不存在准直区的情况下都是如此，这表明RBF系统去除的微生物不一定易受洪水的冲刷。归类区域。

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  • 来源
    《Environmental Science & Technology》 |2009年第3期|669-676|共8页
  • 作者

    VISHAL GUPTA; W. P. JOHNSON; P. SHAFIEIAN; H. RYU; A. ALUM; M. ABBASZADEGAN S. A. HUBBS; AND; T. RAUCH-WILLIAMS;

  • 作者单位

    Department of Metallurgical Engineering, University of Utah,rnSalt Lake City, Utah 84112, Department of Geology andrnGeophysics, University of Utah, Salt Lake City, Utah 84112,rnDepartment of Civil and Environmental Engineering, ArizonarnState University, Tempe, Arizona 85287, Water AdvicernAssociates, Louisville, Kentucky 40207, and Carollo Engineers,rnBroomfield, Colorado 80021;

  • 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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