本文讨论了近几年来，膜法在城市水处理系统中的应用迅速增长。这种增长是由一系列因素推动的，例如:更严格的饮用水法规；对改善产品水质量的渴望；操作方便；而且，与传统处理工艺相比，提高了成本竞争力。微滤膜和超滤膜的孔径通常分别为0.1至0.2微米和13000至100000道尔顿，并根据具体应用和膜产品在20至75 psi的进料压力下运行。包括表、图。

This paper discusses the rapid growth in the use of membrane processes for municipal water treatment systems in the last few years. This growth is being driven by a number of factors such as: more stringent drinking water regulations; desire for improved product water quality; ease of operation; and, increasing cost-competitiveness with conventional treatment processes. Microfiltration and ultrafiltration membranes typically have pore sizes rated at 0.1 to 0.2 microns and 13,000 to 100,000 daltons, respectively, and operate at feed pressures between 20 and 75 psi depending on the specific application and membrane product. Includes table, figure.