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In response to extended drought conditions and shrinking source water supply, the City ofWichita Falls has begun a capital improvements program to build a new dual-stagemembrane (microfiltration and reverse osmosis) water treatment plant necessary to developan existing surface water supply that was historically considered unfit as a public watersupply.The use of membranes is expanding towards the treatment of more complex source watersfeaturing high levels of dissolved contaminants (DOC, color, taste and odor causingsubstances) and high levels of particulate material (turbidity, microorganisms, suspendedsolids). When membranes are considered for these more difficult to treat waters, the choiceof direct filtration must be evaluated against integration of a preclarification unit process.This paper presents the pilot evaluation process and data used to select a pretreatmentapproach used to design the new 10 MGD dual stage membrane surface water plant for theCity of Wichita Falls, Texas. The performance of the membrane pilot system is discussedfor both scenarios: in direct dosing/filtration and in preclarification. Design of the coresystem equipment and calculation tools developed during the design of the system is alsopresented. Includes tables, figures.

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Edition: Vol. - No. Published: 03/05/2003 Number of Pages: 10File Size: 1 file , 360 KB