尽管许多研究已经检验了通过过滤过程去除隐孢子虫和其他病原体的方法，但这些研究通常是在稳定状态下进行的，并进行了优化的预处理。在混凝和絮凝过程中，充分的化学预处理对于在过滤过程中保持良好的颗粒去除至关重要。此外，一些研究表明，混凝工艺对于提高微小隐孢子虫和贾第虫的过滤去除效率非常重要。在这项研究中，将隐孢子虫在基准稳定操作条件下通过过滤器与次优凝固期、过滤器成熟期、突破期和水力波动期的去除率进行了比较。将隐孢子虫的去除与颗粒物和浊度的去除进行了比较。额外的中试规模调查研究了减轻过滤器运行影响的方法。 实验室规模的调查有助于进一步理解，并从过滤稳健性方面评估了中试规模的结果。本文介绍了选定的关键研究结果，总结了主要结论，简要讨论了结果的监管含义，并对公用事业公司提供了指导。包括12个参考文献、表格、图表。

Although numerous investigations have examined the removal of Cryptosporidiumparvum and other pathogens through filtration processes, those studies have generally been conducted under steady-state conditions with optimized pretreatment. Adequate chemical pretreatment during coagulation and flocculation is critical for maintaining good particle removal during filtration. Furthermore, several studies have indicated the importance of coagulation processes for improving filter removal efficiencies of Cryptosporidium parvum and Giardia. In this investigation, Cryptosporidium passage through filters under benchmark stable operating conditions was compared to removals during periods of suboptimal coagulation, as well as during filter ripening, breakthrough and hydraulic surges. The removal of Cryptosporidium was compared to the removal of particles and turbidity. Additional pilot scale investigations examined ways of mitigating filter operation effects. Bench-scale investigations contributed additional understanding and pilot-scale results were evaluated in terms of filtration robustness. This paper presents selected key study results, summarizes the main conclusions, briefly discusses regulatory implications of the results, and presents guidance to utilities. Includes 12 references, table, figures.