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The North Clackamas County Water Commission (NCCWC) WTP is located along theClackamas River, and is co-owned by the Sunrise Water Authority (SWA), Oak LodgeWater District and City of Gladstone. The plant serves over 40,000 customers in thesoutheast suburbs of Portland, Oregon. The existing 10 mgd Slow Sand Filter Plant wasconstructed in 1997 and was expanded to 25 mgd using low pressure, submergedmembrane technology. US Filter's CMF submerged microfiltration system was selectedfor the expansion. The expanded facility is a unique combination of new and old,combining the earliest filtration technology ¿¿¿¿¿¿¿¿ slow sand filtration ¿¿¿¿¿¿¿¿ with the latest intechnology ¿¿¿¿¿¿¿¿ submerged membranes ¿¿¿¿¿¿¿¿ operating in parallel. The project was under a tight schedule. The existing plant was at capacity, and additionalwater was needed as quickly as possible to meet summer peak demands. Through a fast-trackedand innovative process focused on partnership and cooperation, the project teamwas able to select the membrane supplier, complete the design, select the generalcontractor and substantially complete construction in 17 months. Following membrane vendor selection, validation pilot testing was performed concurrentwith design. This pilot testing confirmed that the vendor proposed conservativelyappropriate design criteria, and the plant design could proceed unchanged. Interestingly,this was a qualifications-based selection process for the membrane manufacturer, whichpromoted more reasonable design criteria than a traditional low-bidapproach.Following validation testing, NCCWC elected to participate in an AWWARF Studyentitled "Optimization of Membrane Treatment for Direct and Clarified Water Filtration"(AWWA, 2005). This study provided the unique opportunity to compare and contrastresults from bench- and pilot-scale analysis. This presentation summarizes thefindings from each of the two types of data collection efforts, clearly demonstrating thebenefits of each in developing full-scale design criteria and predicting the performance ofthe full-scale plant. This predicted performance is also compared to full-scale datacollected during the first 10-months of plant operation. Finally, this study presentsa summary of recommendations to design professionals on the benefits and appropriateuse of bench and pilot scale data to efficiently and cost-effectively develop full-scalemembrane treatment plant designs. This information will assist those in the waterindustry as full-scale implementation of membrane technology continues to grow. Includes table.

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Edition: Vol. - No. Published: 06/01/2006 Number of Pages: 5File Size: 1 file , 640 KB