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During wet weather events, separate and combined wastewater
collection systems deliver substantial amounts of storm water
runoff to wastewater treatment plants. Often these flows inundate
collection systems and treatment works creating bypasses of
untreated or partially treated wastewater. The federal Clean Water
Act (CWA), its amendments, and associated regulations have been
attempting to address these concerns for nearly 30 years. These
regulations, coupled with the wastewater treatment standards under
the CWA, are posing immense challenges to the owner/operators of
wastewater systems, who are also driven to provide the most
cost-effective service to customers. This project (WERF Project
00-CTS-6, "Best Practices for the Treatment of Wet Weather
Wastewater Flows") undertook a review of currently available
technologies to improve the performance and efficiency of wet
weather wastewater treatment and also identified potentially
beneficial technologies and methodologies that are emerging in this
area. The project report includes the types and characteristics of
current technologies and methodologies available to ensure
treatment of wet weather wastewater flows. The following are the
categories of technologies are assessed in report: vortex
separation, enhanced clarification, operational enhancements,
flushing systems, and disinfection.
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