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The role of the schmutzdecke in Escherichia coli removal in slow sand and riverbank filtration.

机译:schmutzdecke在慢沙和河岸过滤中去除大肠杆菌的作用。

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摘要

A series of studies was conducted on laboratory scale sand columns under varying operational and design conditions with spiked concentrations of E. coli to investigate the role of the schmutzdecke, a biologically active layer that develops at the interface of the water and filter in slow sand filtration (SSF) and riverbank filtration (RBF). Results confirmed that E. coli removals in slow-rate biological filters occur primarily at the interface and are related to schmutzdecke ripening state, empty bed contact time, biological activity, temperature, and protistan abundance. Using a suite of analyses characterizing the biofilm growing on the schmutzdecke, no connection was found between the preexisting extent of biological ripening and a filter's ability to recover from a scouring or scraping event that removed the schmutzdecke. Biological activity, as measured by CO2 respiration in the top 2.5 cm, as well as protistan abundance in the top 0.5 cm of the schmutzdecke did, however, correlate positively to E. coli removal. The role of predation deserves further investigation, and filters should be operated in such a way as to enhance biological activity and protistan abundance in the schmutzdecke.
机译:在实验室规模的沙柱上,在不同的操作和设计条件下,对大肠杆菌浓度加标,进行了一系列研究,以研究schmutzdecke的作用,schmutzdecke是在水和滤池界面处发展的生物活性层,在缓慢的砂滤中(SSF)和河岸过滤(RBF)。结果证实,慢速生物滤池中的大肠杆菌去除主要发生在界面处,并且与schmutzdecke成熟状态,空床接触时间,生物活性,温度和protstan丰度有关。通过使用一系列分析来表征在schmutzdecke上生长的生物膜,没有发现生物学成熟度与过滤器从去除schmutzdecke的精练或刮擦事件中恢复的能力之间的联系。然而,通过schmutzdecke顶部2.5 cm处的CO2呼吸以及顶部0.5 cm处的Protistan丰度,生物活性与大肠杆菌的去除呈正相关。捕食的作用值得进一步研究,应以增强schmutzdecke的生物活性和protstan丰度的方式操作过滤器。

著录项

  • 作者

    Unger, Michael C.;

  • 作者单位

    University of New Hampshire.;

  • 授予单位 University of New Hampshire.;
  • 学科 Engineering Civil.;Engineering Environmental.
  • 学位 M.S.
  • 年度 2006
  • 页码 208 p.
  • 总页数 208
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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