本研究的目的是使用中试工厂过滤系统，检查颗粒介质过滤器在常规和生物条件下的物理性能。研究的性能参数包括浊度、PSD（通过总颗粒数（TPC）和β（B）进行评估）和水头损失。研究一考察了双介质（无烟煤/砂）过滤器在常规和生物条件下的性能，特别是预氯化（PC）反洗氯化（BWC）和非氯化（NC）条件。研究二评估了不同过滤介质在NC条件下的性能。检查的介质为双介质（无烟煤/砂）、砂和三种不同类型的GAC。本研究是整个项目的一部分，该项目考察了有机物的生物处理，包括臭氧DBP、DBP前体和可生物降解有机物。 米尔纳和萨默斯已经报道了这些结果。此外，Miltner等人报告了反冲洗对生物过滤器有机物去除性能的影响。在本研究的早期阶段，据报告，与反冲洗氯化和非氯化过滤器相比，预氯化导致过滤器出水颗粒数略低。

The objective of this study was to examine the physical performance of granular media filters under conventional and biological conditions using a pilot plant filtration system. The performance parameters investigated were turbidity, PSDs (as evaluated by total particle counts (TPCs) and beta (B)), and headloss. Study One examined the performance of dual media (anthracite/sand) filters under conventional and biological conditions, specifically, pre-chlorinated (PC) backwash-chlorinated (BWC) and non-chlorinated (NC) conditions. Study Two evaluated the performance of different filter media under NC conditions. The media examined were dual media (anthracite/sand), sand, and three different types of GAC. The overall project, of which this study was a part, examined the biotreatment of organic matter, including ozone DBPs, DBP precursors, and biodegradable organic matter. These results have been reported by Miltner and Summers. In addition, the impact of backwashing on the organic removal performance of biological filters was reported by Miltner et al. In the early phases of this study, it was reported that pre-chlorination resulted in slightly lower filter effluent particle counts in comparison to backwash-chlorinated and non-chlorinated filters.