Modeling microbial products in activated sludge under feast#famine conditions

Bing Jie Ni, Fang Fang, Bruce Rittmann, Han Qing Yu

Research output: Contribution to journalArticlepeer-review

59 Scopus citations


We develop an expanded unified model that integrates production and consumption of internal storage products (X STO) into a unified model for extracellular polymeric substances (EPS), soluble microbial products (SMP), and active and inert biomass in activated sludge. We also conducted independent experiments to find needed parameter values and to test the ability of the expanded unified model to describe all the microbial products, along with original substrate and oxygen uptake. The model simulations match all experimental measurements and provide insights into the dynamics of soluble and solid components in activated sludge exposed to dynamic feast-and-famine conditions in two batch experiments and in one cycle of a sequencing batch reactor. In particular, the model illustrates how X STO cycles up and down rapidly during feast and famine periods, while EPS and biomass components are relatively stable despite feast and famine. The agreement between model outputs and experimental EPS, SMP, and X STO data from distinctly different experiments supports that the expanded unified model properly captures the relationships among the forms of microbial products.

Original languageEnglish (US)
Pages (from-to)2489-2497
Number of pages9
JournalEnvironmental Science and Technology
Issue number7
StatePublished - Apr 1 2009

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry


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