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The North Bay Aqueduct (NBA), part of the California State Water Project managed by Department of WaterResources, is a 27-mile underground pipeline serving municipal and industrial water users in Napa andSolano counties. Rapidly changing water quality conditions have historically been a tremendousoperator challenge for utilities treating water from the NBA, particularly in the maintenance of stablecoagulation conditions during treatment.This paper reports on a project to evaluate the use of strong base anion (SBA) exchange resin forthe removal of total organic carbon (TOC), specifically dissolved organic carbon (DOC), from NorthBay Aqueduct (NBA) water. The use of SBA technology has shown considerable promise forsignificant removal of DOC from raw water, resulting in reduction of coagulant and disinfectantdemands while reducing disinfection byproduct (DBP) formation.A two-phased approach has been taken to evaluate the effectiveness of using ion-exchange technologyto treat NBA water. During the first phase, bench-scale adsorption studies were undertaken using aseries of ion-exchange resins. The purpose of bench-scale testing was to determine an appropriateSBA resin to test at the pilot-scale. The resins were evaluated on their ability to remove naturalorganic material (NOM) from NBA water prior to simulated conventional treatment.Following the bench-scale tests, pilot-scale tests were undertaken using the resin recommended bybench-scale testing. Pilot scale tests were performed to characterize the benefits of ion exchange pretreatmenton the downstream processes of coagulation, sedimentation, and filtration. Optimization ofthe ion-exchange process was followed by observation of the performance of the downstreamprocesses during baseline conditions and events of elevated TOC and turbidity. Comparisons weremade by using two trains, one with SBA exchange pre-treatment and one without. Includes tables, figures.

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Edition: Vol. - No. Published: 11/15/2004 Number of Pages: 20 File Size: 1 file , 1.1 MB