Multiplicity patterns of activated-sludge with substrate-inhibition kinetics

Moshe Sheintuch*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Patterns of multiple steady states, due to substrate-inhibition kinetics, are analyzed for a realistic activated-sludge model that accounts for reactor-settler interaction and for the deterioration of settler performance with increased recycle ratio. It is shown that solutions can form, then, isolated branches or mushroom-shaped diagrams rather than the expected hysteresis loop. A systematic methodology for organizing analytical or experimental results, in the form of maps showing domains of bistability, is presented and applied.

Original languageEnglish
Pages (from-to)929-938
Number of pages10
JournalWater Research
Issue number5
StatePublished - May 1993
Externally publishedYes


  • activated-sludge
  • settler
  • steady state multiplicity


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