Skip to main content

Assessing the Potential for Nitrification Inhibition at Wastewater Treatment Facilities as a Result of Zinc Orthophosphate Addition to Potable Water Distribution Systems

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


Portions of the greater metropolitan District of Columbia area have water distribution system corrosion problems. This has resulted in elevated levels of heavy metals, in particular lead from some plumbing and service connections. One alternative being considered for corrosion control is the addition of either phosphoric acid (ortho-phosphate) or zinc ortho-phosphate based products at the water treatment plant to inhibit corrosion of plumbing and service connections that contain lead (Cadmus, 2004). A potential consequence of the addition of zinc orthophosphate (ZnOP) to the water supply is the impact of Zn on the operation of the wastewater treatment plants that receive and treat sanitary wastewater from treated water supplies. The objective of this study was to evaluate the impact of ZnOP, and specifically Zn2+, on the nitrification process at the Arlington County, Virginia Water Pollution Control Plant (WPCP). Inhibition was investigated using continuous respirometry and nitrate generation rate measurements at the Zn concentration increment expected in the influent wastewater (0.3–0.5 mg/L) as a result of corrosion inhibitor use, although much higher levels of Zn were also evaluated. Short-term batch experiments up to 5 days in length were conducted with fresh mixed liquor samples in an attempt to make 0.5 mg/L Zn as inhibitory as possible, providing conditions that would be expected to sensitize the biomass to Zn stress. Results suggest no significant inhibition at 0.5 mg/L Zn, slight inhibition at 1.0 mg/L Zn after roughly 5–10 hours of exposure, and significant inhibition at 10 mg/L Zn.

Document Type: Research Article


Publication date: 2006-01-01

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 These proceedings are not peer reviewed.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