Skip to main content

Critical Components of Biofilm Models for Engineering Practice

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Biofilm models are valuable tools for process engineers despite several uncertainties including the dynamics and rate of biofilm detachment, concentration gradients external to the biofilm surface, and undefined biofilm reactor model calibration protocol. The present investigation serves to (1) evaluate two ad hoc model calibration procedures, (2) systematically evaluate critical biofilm model assumptions and components, and (3) conduct a sensitivity analysis with the aim of identifying parameter subsets for biofilm reactor model calibration. AQUASIM was used to describe submerged-completely mixed combined carbon oxidation and nitrification IFAS and MBBR systems, and tertiary nitrification and denitrification MBBRs. The magnitude of model output dependency on uncertainties in model parameters was determined by means of a sensitivity analysis. The following conclusions were drawn from this work. Ad-hoc expert-based trial and error calibration may have limited applicability as resulting parameters are often not sufficiently general to predict system performance during other periods, even for the same wastewater treatment plant. At both temperatures simulated (T = 20°C and 12°C), each system modeled was sensitive to changes in the biofilm parameter mass transfer boundary layer thickness (LL). Sensitivity of model predictions to kinetic and biofilm parameters is strongly influenced by temperature. A cold temperature local sensitivity analysis provided evidence that biofilm models are sensitive to changes in mass transfer boundary layer thickness (LL), diffusivity coefficient (D), maximum growth rate (μ), and affinity constant (K) for the ratelimiting substrate. No simple recommendations for the more appropriate model calibration methodology can be suggested as sensitivity of model predictions significantly depends on environmental conditions (e.g., temperature) and treatment objectives (e.g., nitrification, denitrification).
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Keywords: AQUASIM; biofilm; calibration; design; identifiably; model; nitrogen removal; parameter; wastewater

Document Type: Research Article

Publication date: 2010-01-01

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