只有德克萨斯州圣安东尼奥地区的供应商最近才对地表水水源进行处理，以提供饮用水。圣安东尼奥居民历来依赖地下水资源，主要是爱德华·萨基弗（EdwardsAquifer）作为饮用水供应。然而，1996年，Bexar大都会水区（BMWD）开始规划圣安东尼奥第一座从麦地那河取水的地表水处理厂。本文报道了低压膜过滤在麦地那河水上的试验结果。在中试期间，对澄清预处理和吸附预处理进行了评估，以确定对操作膜性能的影响，以及对溶解有机化合物（包括总有机碳、UV254、颜色和消毒副产品前体）去除的影响。 在麦地那河试验场，与原水处理相比，澄清预处理可实现更高的运行效率和溶解有机物的显著去除。这些研究结果与全国其他膜中试研究的结果进行了比较，结果表明，澄清给水运行可使持续流量比未净化给水运行明显增加25%至50%。包括4个参考文献、表格和图表。

Treatment of a surface water source for drinking water supply is a challenge onlyrecently undertaken by purveyors in the San Antonio, Texas area. San Antonioresidents have historically relied on groundwater sources, primarily the EdwardsAquifer, for drinking water supply. In 1996 however, the Bexar Metropolitan WaterDistrict (BMWD) initiated planning for San Antonio's first surface watertreatment plant drawing from the Medina River. In this paper, results from pilottesting of low-pressure membrane filtration on the Medina River water arereported. Clarification pretreatment and adsorption pretreatment were evaluatedduring pilot testing to determine the impact on operational membrane performanceand on removal of dissolved organic compounds including total organic carbon,UV254, color and precursors to disinfection byproducts. At the Medina Rivertesting site, clarification pretreatment was demonstrated to achieve greateroperating efficiency and significant removal of dissolved organics, as comparedto raw water treatment. These findings are compared with results from othermembrane pilot studies across the country to show that clarified feedwateroperation can achieve an apparent increase in sustainable flux between 25% and50% over raw feedwater operation. Includes 4 references, tables, figures.