Full Description

The Eastern Municipal Water District (EMWD) is experiencing rapid growth anddevelopment. To date, the District obtains most of its potable water supply as treated waterfrom the Metropolitan Water District of Southern California (MWD). In an attempt to reducethe reliability on MWD supplies and to meet the anticipated potable water demands, EMWDembarked on a fast-track project in 2000 to provide an additional 10 mgd of water to itssystem 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 existingpumping station that was used to pump Colorado River Water (CRW) into the systemsupply many years ago. Source water for the new treatment plant will initially be CRW offthe existing MWD aqueduct. In the future, there is a possibility of State Project Water andeven 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 treatmentalternatives. An evaluation was carried out that determined that membrane filtration wouldoffer the most flexibility for EMWD to treat both present and future raw water supplies andmeet both present and future water quality regulations. Zenon was chosen as themembrane system supplier and the membrane system design incorporates a noveldeclining flux arrangement that allows for high water recovery. It also incorporates theability 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 membraneperformance and reduce cleaning requirements. The plant layout includes space for futurechemical pre-treatment and PAC addition, should this be required. Includes table, figures.

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Edition: Vol. - No. Published: 03/05/2003 Number of Pages: 10File Size: 1 file , 670 KB