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AWWA WQTC52991
- Seasonal Comparison of ASF Bacteria Inactivation Using Intermediate Ozone on Natural Waters
- Conference Proceeding by American Water Works Association, 01/01/2000
- Publisher: AWWA
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The Interim Enhanced Surface Water Treatment Rule (IESWTR) requirestwo log removal of Cryptosporidium. An additional one log inactivation may be required in the future. This will have a significant impact on water treatment plants, since Cryptosporidium is resistant to typical disinfection with chlorine. Regulation of Cryptosporidium is particularly difficult due to method cost and accuracy limitations. This paper summarizes how ozone pilot work by the Philadelphia Water Department of Philadelphia, Pennsylvania, is addressing these concerns. Specifically, inactivation of aerobic spore-forming (ASF) bacteria by ozone is studied as a potential surrogate for Cryptosporidium inactivation. Aerobic spore formers are also examined as a general measure of process performance for microbial/pathogen removal. A reliable, cost-effective indicator is important to maximize treatment in a multiple barrier approach to pathogen removal. Includes 9 references, tables, figures.
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