本文描述了一项研究，部分是为了获得更多关于颗粒活性炭（GAC）过滤器去除三卤甲烷（THM）前体的数据。该项目的主要目标如下:在中试规模上测试传统处理，包括混凝、沉淀和快速混合介质过滤，在涡轮机承包商中进行接触时间短的臭氧氧化，然后与残余臭氧接触更长的停留时间，以及在下流模式下运行的填充床中进行GAC吸附，美国南部一个天然有机物含量高的水库，在有无预先分区以去除THM前体的情况下；确定GAC过滤器中的细菌数量，以及这些细菌在去除有机物的纯吸附过程中所起的作用；并评估向现有美国水处理厂（如本研究水源供应的水处理厂）添加GAC过滤器的资本和运营成本。 结果表明，通过优化这些色谱柱内发生的物理和微生物过程，GAC色谱柱可以延长使用寿命。以THM生成潜力为主要分析标准，采用明矾絮凝、混合介质过滤和GAC吸附相结合的方法，对本实验的水源水进行处理，使其达到0.10 mg/L的最大污染物水平（MCL）超过一年。包括20个参考文献、表格和图表。

This article describes a study carried out in part to obtain more data on removal of trihalomethane (THM) precursors by granular activated carbon (GAC) filters. The principal objectives of the project were as follows: to test, on a pilot scale, traditional treatment including coagulation, sedimentation, and rapid mixed-media filtration, ozonation in a turbine contractor with short contact time, followed by a longer residence time in contact with residual ozone, and GAC adsorption in packed beds operated in a downflow mode, with and without preozonation for the removal of THM precursors, from a southern US reservoir that has high levels of natural organics; to determine the populations of bacteria in the GAC filters and the role these bacteria play in the removal of organic substances vis-a-vis pure adsorption processes; and to evaluate the capital and operating costs for the addition of GAC filters to existing US water treatment plants such as those supplied from the source of water for this study. Results show that GAC columns may be operated for extended lifetimes by optimizing the physical and microbiological processes that occur within these columns. With THM formation potential as the principal analytical criterion, the source water for this experiment was treated to meet the 0.10 mg/L maximum contaminant level (MCL) for more than one year by using a combination of alum flocculation, mixed-media filtration, and GAC adsorption. Includes 20 references, tables, figures.