Increasing the Accuracy of Energy Footprint Predictions for Activated Sludge Processes Using a Rigorous Dynamic Aeration Model

$17.50 plus tax (Refund Policy)

Buy Article:


Aeration modeling is essential not only for insuring the correct nitrification and carbon oxidation, but also for reducing energy costs. Activated sludge models (ASMs) use the oxygen transfer coefficient (kLa) and the dissolved oxygen (DO) at saturation in the DO mass balance to predict oxygen transfer. The oxygen transfer efficiency (OTE) depends on: aeration system type, size and geometry; air flow rate; mixing rates and gradients; diffuser submergence; released bubble size and distribution; diffusers time in operation and consequent fouling and scaling. Moreover, due to the dynamic nature of plant influent load, and the therefore variable air flow rate, OTE is variable over the diurnal and seasonal cycles. Also, due to fouling and scaling, OTE declines with increasing time in operation. These effects are not included in current aeration models and although not crucial for modeling the biochemical processes in the activated sludge, they are necessary to quantify and minimize process energy footprint. Furthermore, it is also expected that this will reduce the need for re-calibration of ASM models. In this contribution, we propose an expanded aeration model by including the dependence of aeration efficiency to the aforementioned design and process parameters. The potential for energy footprint reduction during operation was calculated as the resulting energy savings from minimized excess DO.

Keywords: Activated Sludge Models; Aeration efficiency; Carbon footprint; Energy footprint; Oxygen Transfer

Document Type: Research Article


Publication date: January 1, 2011

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 These proceedings are not peer reviewed.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
  • ingentaconnect is not responsible for the content or availability of external websites



Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect 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