Simulations of reactive settling of activated sludge with a reduced biokinetic model

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Denitrification during the sedimentation process in secondary settlers in waste-water treatment plants has been reported to be still a significant problem. The modelling of such a process with the conservation of mass leads to a nonlinear convection–diffusion–reaction partial differential equation, which needs non-standard numerical methods to obtain reliable simulations. The purpose of this study is to provide a first extension of the Bürger–Diehl settler model, which models sedimentation without reactions, to include biological reactions. This is done with a reduced biokinetic model that contains only the relevant particulate and soluble components. Furthermore, the development is limited to batch settling. The final model describes the last settling stage of a sequencing batch reactor with denitrification. The main result of the paper is a numerical scheme that is tested for simulations with several initial conditions.


  • Raimund Bürger
  • Julio Careaga
  • Stefan Diehl
  • Camilo Mejías
  • Ingmar Nopens
  • Elena Torfs
  • Peter A. Vanrolleghem
Enheter & grupper
Externa organisationer
  • University of Concepción
  • Ghent University
  • Laval University

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Beräkningsmatematik


Sidor (från-till)216-229
Antal sidor14
TidskriftComputers and Chemical Engineering
StatusPublished - 2016 sep 2
Peer review utfördJa