Skip to main content

Model-Based Optimization of Controller Settings at the WWTP of Oostende: Trade-off between N Removal and Energy Savings

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


At the WWTP of Oostende, operated by Aquafin, an advanced aeration control is installed, based on online measurement of oxygen in the carrousel and of both nitrate and ammonium at the effluent of the activated sludge tanks. As the plant meets the discharge limits at all times, a model was set up to evaluate the possibilities to reduce the energy consumption of the plant. Based on data from the years 2006 and 2007, the model was calibrated and resulted in good agreement with the available data of daily aeration energy consumption. Monthly averages agree with differences around 5% and never more than 10%. The same conclusion could also be made for total energy.

A scenario analysis on the aeration controller settings (based on DO, NH4 and NO3 on-line sensors) revealed that an energy saving up to 5.5% can be obtained. Total nitrogen would slightly deteriorate (effluent NH4 increases but NO3 decreases). So, it is clear that – as the plant already has an advanced aeration controller – no gain in energy consumption can be achieved without giving up on effluent quality, and that an optimum combination of set-points can be selected whether energy or effluent consents are the target.

Keywords: Aeration energy modeling; WWTP modelling; energy saving; scenario analysis

Document Type: Research Article


Publication date: 2011-01-01

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 These proceedings are not peer reviewed.

    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
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree 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