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AWWA QTC97195
- Control of Magnesium Silicate Scaling in Austin's Lime Softened Water
- Conference Proceeding by American Water Works Association, 01/01/1997
- Publisher: AWWA
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The Water and Wastewater Utility of the City of Austin, Texas, has experienced significant scaling problems as a result of the high pH and chemical constituents of its finished water. The pH of water leaving the Utility's three water treatment plants ranges from 9.4 to 10.1. As part of a Safe Drinking Water Act Phase II project, an analysis was conducted to determine the effect of changing the pH of the finished water. Lowering the pH can facilitate disinfection and will help to maximize disinfection efficiency as required by the Disinfectants/Disinfection Byproducts Rule. This paper reports the results of an investigation undertaken to determine the optimum pH for minimizing scale formation in the distribution system and in customer plumbing. Even if alternative disinfection processes are not needed, it may be desirable to remedy the scaling problem. Reducing distribution scaling could reduce costs to both the Utility and its customers.
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