UV Disinfection of Drinking Water: What’s New with Validation and Operations?


  • Scott M. Alpert, PhD, PE, Matthew Valade, PE – Hazen and Sawyer

As compliance deadlines for the EPA’s Long Term 2 Enhanced Surface Water Treatment Rule are being reached, more and more utilities are considering ultraviolet (UV) disinfection for additional Cryptosporidium inactivation credits, as well as credit for the inactivation of Giardia and viruses to help control disinfection byproducts from chlorine disinfection. The USEPA’s UV Disinfection Guidance Manual (UVDGM, 2006) is the primary standard for conducting reactor validations. However, over the past few years, several new developments in UV disinfection technology have been released, including the following new standards and guidelines to better help utilities and regulators apply the technology.

ANSI/AWWA F110?12 – Ultraviolet Disinfection Systems for Drinking Water (August 2012)
• UV Disinfection Knowledge Base, WaterRF 3117 (2012)
• Ultraviolet Disinfection Guidelines for Drinking Water and Water Reuse, Third Edition, NWRI (August 2012)

In addition, the Medium?Pressure Low Wavelength Impacts Working Group is continuing its work to better understand the correlation between validation with MS2 and inactivation of Cryptosporidium by wavelengths below 240 nm.

By using specific case studies, the authors will convey how the UVDGM can be combined with the latest knowledge to evaluate the validation and operation of UV disinfection systems. An update also will be provided on how the UV community is addressing the challenge of validating medium pressure UV equipment. As such, this presentation will be helpful to utilities, state regulators, and consultants who have installed, or are considering the installation of, UV disinfection systems at drinking water treatment facilities.

For more information, please contact the author at salpert@hazenandsawyer.com.

Hear about new publications with our email newsletter

We will never share your details with anyone else.


Newsletter Newsletter

Horizons Fall 2017 (pdf)

Horizons showcases significant water, wastewater, reuse, and stormwater projects and innovations that help our clients to achieve their goals, and can help you achieve yours. Articles are written by top engineers and process group leaders, demonstrating and explaining the beneficial application of a variety of technologies and tools.

View previous issues »