Skip to main content


Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


The United Kingdom is in the middle of the third 5 year Asset Management Program (AMP 3) since privatisation began in England and Wales. At the outset of AMP 3 the Environment Agency set new ammonia discharge permits for many existing works.

Most of these new works require the addition of tertiary treatment to meet these new discharge permits and nitrifying trickling filters (NTF)s may provide a cost effective solution for a considerable number of these works.

This paper examines the performance of two existing works where plastic media NTFs have been incorporated into the treatment process. The analysis concentrates on the performance of the NTFs with respect to the ammonia discharge quality they can be expected to meet. In addition the paper presents data to demonstrate their effect on BOD, suspended solids and alkalinity.

A reliable and simple method for the engineer to size the filters is essential for the successful implementation of this technology. This paper uses 2 popular design methods to model the predicted performance of the NTFs and compares the results to the actual performance from the filters under known conditions.

The results show that a NTF tertiary treatment plant can reliably meet an ammonia quality of 3mg/l for a 95percentile of samples, in a UK type climate.

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 These proceedings are not peer reviewed.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