Skip to main content

What are Distributed States and when are they Important? New Strategies to Improve EBPR Performance

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

Computer simulation of activated sludge processes is a critical tool for design, operation, and troubleshooting, but simulating enhanced biological phosphorus removal (EBPR) systems has proven to be particularly challenging. This may be due in part to uncertainties in biokinetic models, but new research suggests it may also be due to deficiencies in conventional “lumped state” approaches to simulation, which model bulk concentrations of the polyphosphate accumulating organisms (PAOs) responsible for EBPR, as well as their microbial storage product (polyphosphate, glycogen, and polyhydroxyalkanoates) contents. A recently developed, alternative method for modeling biological treatment systems is the “distributed state” approach, which models individual bacteria as they move through a biological reactor system, rather than bulk concentrations. This approach predicts that PAO states (their microbial storage product contents) tend to diverge when reactors are completely mixed, and this can produce very different outcomes than those predicted by the conventional lumped approach. A MATLAB-based distributed state program (DisSimulator 2.0) was applied to an A2O system and it was determined that distributed states tend to become more important with (1) shorter internal recycle ratios and (2) longer reactor hydraulic residence times. Consequently errors resulting from relying on lumped simulations are greatest in these conditions. This work illustrates that there appear to be interesting process phenomena related to changing state distributions that apparently cannot be accounted for by lumped simulations. These insights suggest that the continued advancement of the distributed simulator approach has the potential to improve design and operation of biological nutrient removal systems.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

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