东部城市水区（EMWD）正在经历快速增长和 发展到目前为止，该地区的大部分饮用水供应都是经过处理的水 来自南加州大都会水区（MWD）。为了减少 MWD供应的可靠性，以及满足预期饮用水需求的可靠性，EMWD 在2000年开始了一个快速通道项目，为其供水增加10 mgd 尽快建立系统。该工厂的总体规划容量为50 mgd。 该项目涉及在现有的一个工厂建造一个新的膜处理设施 用于将科罗拉多河水（CRW）泵入系统的泵站 许多年前就开始供应了。新处理厂的水源最初将被CRW关闭 现有MWD渡槽。在未来，有可能进行国家水和能源项目 甚至来自附近佩里湖的水也被作为水源输送到工厂。 由于项目的快速性，没有时间进行试验性治疗 选择。进行了一项评估，确定膜过滤将 为EMWD提供最大的灵活性，以处理当前和未来的原水供应和 满足当前和未来的水质法规。泽农被选为首席执行官 膜系统供应商和膜系统设计采用了一种新的 允许高水回收率的流量递减安排。它还包括 能够定期反转原水流动方向（和锥形流量），以允许尾部- 将端膜暴露在清洁的给水中。这将改善膜的性能 提高性能，减少清洁要求。工厂布局包括未来的空间 化学预处理和PAC添加（如果需要）。包括表格，数字。

The Eastern Municipal Water District (EMWD) is experiencing rapid growth and development. To date, the District obtains most of its potable water supply as treated water from the Metropolitan Water District of Southern California (MWD). In an attempt to reduce the reliability on MWD supplies and to meet the anticipated potable water demands, EMWD embarked on a fast-track project in 2000 to provide an additional 10 mgd of water to its system as soon as possible. The plant would be master planned to 50 mgd of capacity. The project involved the construction of a new membrane treatment facility at an existing pumping station that was used to pump Colorado River Water (CRW) into the system supply many years ago. Source water for the new treatment plant will initially be CRW off the existing MWD aqueduct. In the future, there is a possibility of State Project Water and even water from nearby Lake Perris being delivered to the plant as source water. Due to the fast-track nature of the project there was no time to pilot test treatment alternatives. An evaluation was carried out that determined that membrane filtration would offer the most flexibility for EMWD to treat both present and future raw water supplies and meet both present and future water quality regulations. Zenon was chosen as the membrane system supplier and the membrane system design incorporates a novel declining flux arrangement that allows for high water recovery. It also incorporates the ability to periodically reverse the raw water flow direction (and tapered flux) to allow the tail- end membranes to be exposed to cleaner feed water. This should improve membrane performance and reduce cleaning requirements. The plant layout includes space for future chemical pre-treatment and PAC addition, should this be required. Includes table, figures.