Reaction invariant-based reduction of the activated sludge model ASM1 for batch applications

Judith A. Santa Cruz, Sergio F. Mussati, Nicolás J. Scenna, Krist Gernaey, Miguel C. Mussati

Research output: Contribution to journalJournal articlepeer-review


In any system, there are some properties, quantities or relationships that remain unchanged despite the applied transformations (system invariants). For a batch reaction system with n linearly independent reactions and m components (n<m) there exist linear combinations of the concentrations that are unaffected by the reaction progress, i.e. so-called reaction invariants. The reaction invariant concept can be used to reduce the number of ordinary differential equations (ODEs) involved in batch bioreactor models. In this paper, a systematic methodology of model reduction based on this concept is applied to batch activated sludge processes described by the Activated Sludge Model No. 1 (ASM1) for carbon and nitrogen removal. The objective of the model reduction is to describe the exact dynamics of the states predicted by the original model with a lower number of ODEs. This leads to a reduction of the numerical complexity as nonlinear ODEs are replaced by linear algebraic relationships predicting the exact dynamics of the original model.
Original languageEnglish
JournalJournal of Environmental Chemical Engineering
Issue number3
Pages (from-to)3654-3664
Publication statusPublished - 2016


  • Activated sludge
  • ASM1 model
  • Batch bioreactor
  • Dynamics
  • Model reduction
  • Reaction invariant


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