Impact of Influent Pipe Configuration on UV Reactor Performance: Is the Elbow Truly the Worst Case Hydraulic Condition?

$17.50 plus tax (Refund Policy)

Buy Article:


A study has been performed to investigate the impact of upstream piping configurations on the UV disinfection performance. In this study, experimental biodosimetry and numerical simulations were performed on a pilot-scale monochromatic reactor with and without an upstream elbow piping configuration. In addition, simulations using a validated numerical model were performed on a full-scale polychromatic reactor with an upstream straight pipe configuration and two alternate elbow configurations. These three piping configurations were compared with elbow configuration tested during validation of the reactor.

The results of the pilot scale tests showed that the placement of an elbow upstream from a UV reactor reduced the log inactivation compared to the same reactor placed downstream of a straight pipe configuration. The numerical model of the two upstream configurations agreed well with the experimental biodosimetry results. The lower log inactivation was caused by a shift in the fluence distribution to a lower fluence region due to the change in hydraulic characteristics and path taken by the microorganisms. Simulations of the full-scale reactor showed that not all influent elbow configurations lead to a reduction in the log inactivation compared to the straight pipe configuration. Consequently, the upstream elbow configuration may not universally represent the worst case hydraulic condition. It may be important to use a validated CFD UV model to simulate the actual site specific hydraulic conditions to determine the UV disinfection performance, since it will be cost prohibitive for validation facilities to exactly mimic all site specific WTP conditions.

Document Type: Research Article


Publication date: January 1, 2005

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 These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • ingentaconnect is not responsible for the content or availability of external websites



Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect 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