利用激光粒度分析仪对传统水处理厂的原水、沉淀水和过滤水的粒度分布进行了表征。对粒度分布趋势进行了表征，并使用中试装置对直接过滤操作模式下的粒度分布进行了表征。作者建立了一个概念性的过滤模型，该模型结合了颗粒附着和分离以及滤床中的虫洞流动。提出的方程包含了粒子附着和分离的术语，其形式与从基本考虑发展而来的轨道理论相一致。 使用明矾混凝的双介质过滤器排出的废水中的粒度分布由沉积物从过滤床上的分离控制的结论增加了不稳定颗粒通过运行良好的过滤器的可能性。这些颗粒可能会干扰消毒。

A laser-based particle size analyzer was used to characterize the raw, settled, and filtered water particulate size distributions in a conventional water treatment plant. Particle size distribution trends were characterized and a pilot plant was used to characterize particle size distributions in the direct filtration mode of operation. The authors formulated a conceptual filtration model that incorporates particle attachment and detachment as well as wormhole flow in the filter bed. The proposed equation incorporates terms for particle attachment and detachment in a form compatible with trajectory theories that have been developed from fundamental considerations. The conclusion that the particle size distribution in the effluent from dual-media filters using alum coagulation is controlled by the detachment of deposits from the filter bed raises the possibility of the passage of destabilized particles through a well-operated filter. These particles could interfere with disinfection.