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In 2002, the Modesto (California) Irrigation District (District) set out on a program to expand theirexisting treatment works. The process, designed in the early 1990s, was state of theart at the time, consisting of pre-ozonation, flocculation/sedimentation, and deep-bedmonomedia anthracite filtration. The process has worked effectively since start-up inlate 1994 and treats a relatively high quality surface water.During pre-design studies in 2003, Operations and Maintenance staff suggestedconsideration of membrane filtration for the Phase II expansion of the ModestoRegional WTP, from 36 to 72 million gallons per day (mgd). Operational reliabilityand the lack of chemical pretreatment were two of the reasons cited for expandingthe facility with membrane filtration technology.This paper discusses the treatment process selection, integration into the existingprocess, and recommended staffing requirements for the expanded plant with a firmsummertime production capacity of 72-mgd with forward flow capability of over 85-mgd. Includes tables, figure.

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Edition: Vol. - No. Published: 03/01/2007 Number of Pages: 5File Size: 1 file