Skip to main content


Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


Two constructed wetlands systems developed for reuse of nitrate-contaminated water in western Phoenix, AZ were analyzed for removal efficacy in this study. Field rates were obtained from the Wetlands of Avondale under variable flow (0–18 mgd) and temperature (13–32°C) conditions. Laboratory batch tests were also performed using wetland sediment and water from both the Avondale and Tres Rios Wetlands under non-mass transfer limited conditions. Batch tests containing wetland water only demonstrated zero biological denitrification activity, and subsequent denitrification activity was linked to sediment in the vegetative islands. Per vegetative-island area rates were compared and field rates (0.7–2.6 kg N/acre*day) were approximately an order of magnitude lower than non-mass transfer limited laboratory rates (13.0–20.6 kg N/acre*day). Removal rates in both the laboratory and the field displayed zero-order kinetics and were similar under varied flow conditions. Temperature increases of approximately 15° C enhanced field rates about 3-fold, however. Turbulent diffusion, or dispersion, in the field appeared to dominate mass transfer as denitrification rates in the field were comparable under different flow regimes at similar temperatures. Increases in denitrification rates with temperature in the field were comparable to the predicted effect of increased microbial kinetic reaction rates.

Document Type: Research Article


Publication date: 2001-01-01

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 These proceedings are not peer reviewed.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