本研究的具体目标包括: 对各种媒体特征和运营模式的相对重要性进行排名 生物过滤去除大肠杆菌的条件； 评估突然移除schmutzdecke对病原体的影响 在发生冲刷或清洁的情况下移除，以及过滤器从中恢复的能力 这样的事件； 比较原生生物捕食与吸附和应变的作用 病原体清除机制；和 确定生物活性对病原体的影响程度 在生物过滤器中去除。具体来说，细胞外聚合物 饮用水处理过程中生物膜的排泄物会增强 过滤介质的“粘性”？ 方法包括 六项实验室规模的研究 不同操作和设计条件下的砂柱 增加大肠杆菌浓度以评估去除效率。结果证实E。 在慢速生物滤池中，大肠杆菌的去除主要发生在界面处。这些界面 清除似乎与schmutzdecke成熟状态、空床接触时间、， 生物活性、温度和原生生物丰度。包括11个参考文献、表格、图表。

The specific objectives of this research included: ranking the relative importance of various media characteristics and operational conditions on biofiltration removals of E. coli bacteria; assessing the effect of a sudden removal of the schmutzdecke on pathogen removal in the event of scouring or cleaning and a filter's ability to recover from such an event; comparing the role of protistan predation to that of adsorption and straining as a pathogen removal mechanism; and, determining the extent to which biological activity contributes to pathogen removal in a biological filter. Specifically, do the extracellular polymeric excretions of the biofilm present in drinking water treatment enhance the "stickiness" of filter media? Methods included six studies conducted on laboratory scale sand columns under varying operational and design conditions with spiked concentrations of E. coli to assess removal efficiency. Results confirmed that E. coli removals in slow-rate biological filters occur primarily at the interface. These interfacial removals appear to be related to schmutzdecke ripening state, empty bed contact time, biological activity, temperature, and protistan abundance. Includes 11 references, tables, figures.