The effect of heterotrophic yield on the assessment of the correction factor for anoxic growth

D. Orhon*, S. Sozen, N. Artan

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

63 Citations (Scopus)


For single-sludge denitrification systems, modelling of anoxic reactors currently uses the kinetics of aerobic heterotrophic growth together with a correction factor for anoxic conditions. This coefficient is computed on the basis of respirometric measurements with the assumption that the heterotrophic yield remains the same under aerobic and anoxic coditions. The paper provides the conceptual proof that the yield coefficient is significantly lower for the anoxic growth on the basis of the energetics of the related metabolic processes. This is used for the interpretation of the very high values for the correction factor experimentally determined for a number of industrial wastewaters. A default value for the anoxic heterotrophic yield coefficient is calculated for domestic sewage and compatible wastewaters and proposed for similar evaluations.

Original languageEnglish
Pages (from-to)67-74
Number of pages8
JournalWater Science and Technology
Issue number5-6 -6 pt 3
Publication statusPublished - 1996
EventProceedings of the 1996 18th Biennial Conference of the International Association on Water Quality. Part 3 - Singapore, Singapore
Duration: 23 Jun 199628 Jun 1996


  • Confectionary wastes
  • Correction factor
  • Dairy wastes
  • Denitrification
  • Domestic sewage
  • Heterotrophic yield
  • Meat processing wastes
  • Single-sludge systems


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