Sizing UV Disinfection Systems for Water Reuse

Abstract

In 2003, the City of Auburndale's Raymond Allred Wastewater Treatment Plant (WWTP) became the first facility in Florida constructed to meet the Ultraviolet Disinfection Guidelines for Drinking Water and Water Reuse , published in December 2000 by the National Water Research Institute / American Water Works Association Research Foundation (NWRI/AWWARF). These guidelines, and the 2003 revisions, serve as the design basis for high-level UV disinfection systems at wastewater treatment facilities in Florida. The NWRI/AWWARF guidelines establish minimum design requirements for UV disinfection of filtered reclaimed water. An integral part of the guidelines is performance-based testing in which the dose delivery capability of the UV reactor is experimentally validated. The Auburndale WWTP will serve as a case study of how to utilize the performance-based testing results to properly size UV disinfection systems for reuse applications. This will include establishing an acceptable minimum dose, reactor layout, and redundancy requirements. In addition, actual operating data from the Auburndale UV system will be reviewed and compared to permit requirements.