Water Quality Effects Related to Blending Waters in Distribution Systems

摘要

This study was conducted to evaluate the effects of blending two or more waters of different quality and to relate their composition to the corrosive effects and calcium carbonate deposition tendency of the water on distribution systems. The EPA mobile water quality monitoring laboratory was deployed at 30 selected sites in Southern California where imported waters from the Colorado River and California aqueducts are used as delivered or blended with local groundwaters. Eighteen computer-controlled parametric systems on board the laboratory analyzed and recorded field data to assess water quality factors associated with corrosion and stability. The waters studied could be classified as having moderate to high hardness, alkalinity and total dissolved solids content. Cost comparisons for corrosion control by use of caustic soda to adjust pH and zinc phosphate as a corrosion inhibitor were made.