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The Water Filtration Plant (WFP) Improvements Project for the City of Kennewick,Washington was initiated to determine the improvements needed to meet the City'santicipated potable water quality and capacity needs. Submerged low-pressuremembranes offer a cost-effective "No Concrete" solution to expanding the WFP, whichtreats Columbia River water in the summertime to supply peak system demands. This7.5-million-gallons per-day (mgd) plant includes ozone, rapid mix, flocculation,sedimentation, media filtration, and chlorine disinfection. This paper focuses on theapproach and key considerations utilized to implement this unique submergedmembrane retrofit project.Although pressure membrane systems can be used to retrofit conventional water plants,submerged membrane technology was better suited for Kennewick's needs. Zenon andUSFilter/Memcor are the two major suppliers of submerged membrane systems fordrinking water. The system designs are different for each supplier and final designdepends on the selected system.Membrane system procurement is critical and establishing a fair and protest-proofbidding environment is essential. The criteria for and test conditions of the membranepilot testing were developed with this in mind. Careful coordination with each vendor wasrequired to understand the filter building retrofit requirements for each system. Somespecific examples of system design parameters that impact the filter building retrofit are:membrane basin depth, overhead crane/hoist capacity and lifting height for themembranes, and locating the permeate pumps adjacent to the membrane tanks. Includes 4 references, tables, figures.

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Edition: Vol. - No. Published: 06/17/2004 Number of Pages: 21File Size: 1 file , 650 KB