采用两种不同的硅砂滤料（几何平均直径分别为0.51mm和1.41mm）进行了小型过滤实验，以研究在洁净床条件下过滤速度（1.5m/h、5m/h、10m/h）对微小隐孢子虫去除的影响。还选择高岭土和5.1μm聚苯乙烯乳胶粒（PSL）来比较去除过程中的传输特性。实验结果表明，微小隐孢子虫在过滤速度变化时没有明显的去除效果，而其他选定颗粒的去除效果则相反，随着过滤速度的降低，去除效率明显提高。尽管微小隐孢子虫和PSL颗粒在大小和密度上有明显的相似性，但之前的沉降实验表明，它们之间的沉降速度存在差异，这表明这种生物独特的去除机制会产生影响。 使用理论方法帮助解释实验结果；单捕集器效率的计算以及微小隐孢子虫和其他选定颗粒的净床过滤系数和初步碰撞系数。包括32个参考文献、表格和图表。

Bench scale filtration experiments with two different silica sand media (geometric mean diameter of 0.51 mm and 1.41 mm respectively) were conducted to investigate the effect of filtration velocity (1.5 m/h, 5 m/h, 10 m/h) on the removal of Cryptosporidium parvum under clean bed conditions. Kaolin clay and 5.1 um polystyrene latex particles (PSL) were also selected to compare the transport characteristics in the removal process. Experimental results show no clear removal effect with changes in filtration velocity for Cryptosporidium parvum in contrast with results for the other selected particles where a clear increase in removal efficiency was observed as filtration velocity decreased. Although similarities in size and density are noticeable between Cryptosporidium parvum and PSL particles, previous settling experiments show differences in settling velocities among them suggesting the influence of unique removal mechanisms for this organism. A theoretical approach is used to help in the interpretation of the experimental results; single collector efficiency calculations are presented along with clean bed filter coefficients and preliminary collision coefficients for Cryptosporidium parvum and the other selected particles. Includes 32 references, tables, figures.