阿拉米达县水区在加利福尼亚州弗里蒙特运营着一座28米高的地表水处理设施。这家工厂自1993年9月开始运行。本文比较了两种生物过滤介质:颗粒活性炭（GAC）和无烟煤。该研究有两个主要目标:比较GAC替代现有无烟煤介质在水质、运行和成本方面的性能；探索这种比较对决策的影响。

The Alameda County Water District operates a 28 mgd surface water treatment facility in Fremont, California. This plant has been in operation since September 1993. This paper describes a comparison of two filter media for biological filtration: granular activated carbon (GAC) and anthracite. The study had two primary objectives: comparing the performance of a GAC replacement for the existing anthracite media with respect to water quality, operations, and costs; exploring the implications of this comparison for decision-making.