进口水是加州工业的主要资源，但其不断增加的成本导致了满足供水需求的替代方法。本文讨论了使用膜技术处理废水是如何帮助南加州的一个机构缓解其对昂贵的进口水的依赖。它描述了将废水转化为适合工业使用的优质水的处理工艺和设施的性能。位于加利福尼亚州El Segundo的西盆地市政水区水回收厂的三期扩建项目处理从洛杉矶市Hyperion处理厂接收的二级污水，为雪佛龙炼油厂供水。 扩建的目的是提供适合用作雪佛龙炼油厂锅炉给水的优质水。雪佛龙需要两级水。不太严格的等级要求水质为0-mg/l钙、0-mg/l镁、1.5-mg/l硅、0.3 mg/l CaCO3总硬度和60 mg/l总溶解固体。水质等级较高的水含有0-mg/l的钙、0-mg/l的镁、0.1-mg/l的二氧化硅、0.03 mg/l的CaCO3总硬度和小于5 mg/l的总溶解固体。为了满足这些要求，该项目对从Hyperion接收的二级出水进行微滤和反渗透处理。 本文将概述项目目标、实现目标所需的流程和设备，以及建设项目的交付方法。包括6个参考文献、表格、图表。

Imported water is a major resource for industry in California, but its ever-increasing costs are leading to alternative methods for meeting water supply needs. This paper discusses how the use of membrane technology for the treatment of wastewater effluent is helping one Southern California agency relieve its dependency on expensive imported water. It describes the treatment process and the performance of a facility that converts the wastewater effluent to high quality water suitable for industrial use. The West Basin Municipal Water District's Phase III Expansion project at their water recycling plant in El Segundo, California treats secondary effluent received from the City of Los Angeles' Hyperion Treatment Plant to provide water to the Chevron refinery. The purpose of the expansion is to provide high quality water suitable for use as boiler feed water in the Chevron refinery. Chevron requires two grades of water. The less stringent grade requires water quality of 0-mg/l calcium, 0-mg/l magnesium, 1.5-mg/l silica, 0.3 mg/l as CaCO3 total hardness, and 60 mg/l total dissolved solids. The higher quality grade provides water with 0-mg/l calcium, 0-mg/l magnesium, 0.1-mg/l silica, 0.03 mg/l as CaCO3 total hardness, and less than 5 mg/l total dissolved solids. To meet these requirements, the project provides microfiltration and reverse osmosis treatment of secondary effluent wastewater received from Hyperion. This paper will provide an overview of the project goals, the processes and the equipment necessary to achieve the goals, as well as the method of delivery of the construction project. Includes 6 references, tables, figures.