UV Abstract

Bryan Townsend, PE

Over the past decade, the application of ultraviolet (UV) light for disinfection of potable water has increased substantially due in part to its ability to easily inactivate Cryptosporidium and Giardia at relatively low doses. Further fueled by the Long Term 2 Enhanced Surface Water Treatment Rule and the UV Disinfection Guidance Manual, standardized requirements and protocols now exist for the validation, design and operation of UV systems treating surface water sources. This presentation includes a review of the regulatory drivers for UV disinfection, the fundamentals of ultraviolet light, UV disinfection equipment components, and validation of UV systems, as well as design considerations that must be taken into account in order for UV disinfection systems to operate efficiently while protecting public health.

This presentation provides an overview of the use of UV light for photolysis and oxidation of chemical contaminants. The discussion starts out with an overview of why UV light is currently of such great interest to the water industry. The fundamentals of UV photolysis and UV oxidation are presented followed by specific examples of the importance of these fundamentals using results from recent research studies. A summary of the advantages and disadvantages and how UV-AOP is best integrated into a water treatment process train will wrap up the presentation.