Skip to main content

New Validation Methods Account for RED Bias with Wastewater UV Reactors

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


The reduction equivalent dose (RED) measured during biodosimetric UV validation depends on the test microbe's UV dose-response kinetics as well as the reactor's UV dose distribution. Because of these effects, the RED delivered to the test microbe will differ from the RED delivered to a target pathogen or indicator microbe if the dose-response of the test microbe differs from that of the pathogen or indicator. The difference is referred to as the RED bias. Recently, two approaches have been developed and demonstrated with drinking water UV reactors for analyzing validation data that accounts for the RED bias. This paper reports on the application of these methods with a wastewater UV reactor. The first approach incorporates a term for the UV sensitivity of the microbe into the equation used to fit the validation data. The second approach incorporates a lognormal prediction of the UV reactor's dose distribution into the dose-monitoring algorithm and predicts log inactivation using the microbe's UV dose-response curve. Both approaches calibrated using validation data measured using MS2 and T1 phage provided accurate predictions of the log inactivation of QB phage, fecal coliform, and total coliform.

Keywords: RED Bias; Ultravioloet disinfection; dose distributions; validation

Document Type: Research Article


Publication date: 2009-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more