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The San Francisco Public Utilities Commission (SFPUC) plans to expand the sustainable capacity of itsSunol Valley Water Treatment Plant (SVWTP) from 120 mgd to 160 mgd in order to meet the level ofservice goals of its $4.3 billion Water System Improvement Program. Key components of the plantexpansion are construction of a new chlorine contact tank (CCT) and a new 17.5 million gallon treatedwater reservoir (TWR). The purpose of the CCT is to ensure adequate disinfection at higher plant flowsand to minimize disinfection byproduct formation by controlling the time in which the water is in contactwith free chlorine. The size of the CCT needs to be minimized to minimize construction costs, and thisanalysis was used to determine how small it could be while still meeting disinfection requirements. Thesize of the TWR was determined by an analysis of demand patterns. The treated water from the SVWTPwill be chloraminated between the CCT and the TWR. Issues related to the TWR were configuration ofthe inlet and outlet, which also impact construction costs, and minimization of stagnant zones, whichcould contribute to nitrification and resultant loss of chloramine residual. This paper summarizes theresults of computational fluid dynamics (CFD) modeling to predict the hydraulic characteristics of theproposed CCT and TWR. Includes 4 references, tables, figures.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 20File Size: 1 file , 5.8 MB