Skip to main content


Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

The secondary wastewater treatment facility in Westerly Rhode Island has a design capacity of 3.3 mgd. A new permit limit for ammonia of 5.5 mg/l required a plant upgrade. Because of site constraints, a hybrid technology was chosen to meet the new permit limit. This technology is an integrated fixed activated sludge (IFAS) process utilizing the Linpor® System. Engineered, 0.6-inch foam cubes, are suspended in the aeration tank to effectively increase the total mixed liquor suspended solids by allowing the microbes to attach and grow within the pore spaces of the cubes. The mixed liquor suspended solids concentration in the liquid phase remains at conventional levels.

A demonstration pilot plant was operated from February to April of 2001. The influent wastewater temperatures during most of the testing ranged from 9 °C to 12 °C. The pilot facility demonstrated that the permit limit of 5.5 mg/l of ammonia nitrogen and a secondary goal of total nitrogen below 15 mg/l was achievable. In addition, desirable SVI were maintained with a high biomass concentration.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: 2002-01-01

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 These proceedings are not peer reviewed.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