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AWWA QTC97029
- Secondary Water Quality Impacts of High-Concentration Ozone Addition to an Unfiltered Water Supply
- Conference Proceeding by American Water Works Association, 01/01/1997
- Publisher: AWWA
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The Greater Vancouver Water District (GVWD) of Vancouver, British Columbia, supplies about 1.8 million people with high purity, unfiltered drinking water from three reservoirs located in protected, mountainous watersheds. In 1994, GVWD initiated a program to upgrade its primary disinfection facilities to provide 3-log inactivation of Giardia cysts. As part of this effort, a 40 liter per minute prototype plant was utilized to determine ozone demand and decay rates in two of the water supplies along with estimating impacts of ozonation on disinfection byproduct (DBP) formation. The objective of this study was to determine the effect of ozone addition on chlorine demand, DBP formation and biological stability. A series of on-site pilot plant tests were conducted to determine the ozone dose required for 3-log inactivation of Giardia cysts and Cryptosporidium oocysts for three seasons of water quality and temperature based on ozone demand and decay kinetics.
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