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Abilene and Wichita Falls, Texas are expanding their water supply and treatment facilitiesand face similar challenges--the lack of available fresh water supply. Both communitieswill be treating brackish surface water supplies for their expansion projects with membranesystem capacities in the 6-10 million gallons per day (mgd) range.Treatment challenges include salinity reduction, turbidity control, elimination ofobjectionable tastes and odors, and pathogen removal and/or inactivation from the surfacewater supply sources. Furthermore, the membrane-treated product water will be blendedand must be compatible with water from existing supply and treatment facilities.Planned treatment includes dual-membrane processes, microfiltration (MF) or ultrafiltration(UF) for suspended solids and pathogen removal, followed by reverse osmosis (RO) fordissolved solids reduction. Final treatment steps include disinfection and corrosion control.At Abilene, some of the MF/UF product water will bypass the RO treatment and blend withRO permeate, to reduce the capacity of the RO part of the plant and lower overall costs.Because not all of the water will receive RO treatment at Abilene, some color and dissolvedorganic reduction will be achieved by using a coagulant prior to MF/UF. At Wichita Falls,it is planned that all finished water will be treated with RO. Includes tables.

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Edition: Vol. - No. Published: 05/01/2001 Number of Pages: 6File Size: 1 file , 200 KB