隐孢子虫通过颗粒物的操作效应研究进展 介质过滤器已经证明，相对于优化的操作条件，结束- 运行过滤是一个特别脆弱的运行阶段，在此期间 隐孢子虫可能会通过过滤器。在过滤器的上下文中 操作时，系统故障可被视为病原体通过过滤器或 超过指定级别或监管标准的多个过滤器。信息 关于系统故障的风险以及该风险如何随时间变化 对于促进决策和成本/效益分析以优化 运营战略。使用之前报道的中试规模隐孢子虫去除 在渥太华市试验工厂获得的数据显示，感染剂量为 隐孢子虫卵囊被释放到过滤流出物中，随后 对配电系统进行了建模。模型结果显示了相当大的误差 与运行过滤器相比，当过滤器运行超过0.3NTU时，风险增加 直到过滤出水浊度达到0.3NTU或仅为0.1NTU。 该模型还演示了 另一种选择是操作多个彼此相等偏移的过滤器 降低隐孢子虫通过滤过步骤的风险的方法 治疗过程。 包括12个参考文献、表格和图表。

Recent investigations of operational effects on Cryptosporidium passage through granular media filters have demonstrated that, relative to optimized operating conditions, end-of- run filtration is a particularly vulnerable period of operation during which increased Cryptosporidium passage through filters may be expected. In the context of filter operation, system failure can be considered the passage of pathogens through a filter or multiple filters at levels that exceed a specified level or regulatory criterion. Information regarding the risk of system failure and how this risk changes with respect to time is critical to facilitating decision making and cost/benefit analyses for optimizing operational strategies. Using previously reported pilot-scale Cryptosporidium removal data obtained at the City of Ottawa pilot plant, the risk of an infectious dose of Cryptosporidium oocysts being released into a filter effluent and the subsequent distribution system was modeled. The model results demonstrated a considerable increase in risk when a filter is operated beyond 0.3NTU compared to operating the filter until 0.3NTU or to only 0.1NTU of filter effluent turbidity. The model also demonstrated that operating multiple filters that are equally offset from one another is an alternative method to reducing the risk of Cryptosporidium passage through the filtration step of the treatment process. Includes 12 references, tables, figures.