Advanced modeling of mixed populations of heterotrophs and nitrifiers considering the formation and exchange of soluble microbial products

H. Furumai, B. E. Rittmann

Research output: Contribution to journalConference article

58 Scopus citations

Abstract

Biological process modeling is advanced by explicitly describing heterotroph and nitrifier biomass, incorporating formation of soluble microbial products (SMP) from both the bacterial groups, and allowing degradation of SMP by the heterotrophs. Biomass decay now has two parts, endogenous respiration and formation of biomass-associated products (BAP). The model is applied to investigate interactions between heterotrophs and nitrifiers. Main attention is directed to evaluating the role that SMP produced by nitrifiers plays as a supply of organic substrate to heterotrophs and to predicting the COD concentration in the effluent. The model quantitatively describes the observed accumulation of SMP in the effluent at long SRT and at high influent substrate concentration. The significance of SMP from nitrifiers to support growth of heterotrophs is clearly elucidated through the model experiments under various operational conditions. The results indicated that a high NH4+-N/COD ratio in the influent would decrease original substrate COD due to increased heterotrophs whose growth is supported by SMP from nitrifiers, but total COD increases. The minimum substrate concentration, Smin, is reduced for heterotrophs by the additional growth from SMP.

Original languageEnglish (US)
Pages (from-to)493-502
Number of pages10
JournalWater Science and Technology
Volume26
Issue number3-4
DOIs
StatePublished - 1992
EventProceedings of the 16th Biennial Conference of the International Association on Water Pollution Research and Control - Water Quality International '92 - Washington, DC, USA
Duration: May 24 1992May 30 1992

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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