Metabolic model for acetate uptake by a mixed culture of phosphate- and glycogen-accumulating organisms under anaerobic conditions

Nevin Yagci, Nazik Artan*, Emine Ubay Çokgör, Clifford W. Randall, Derin Orhon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)

Abstract

This paper proposes a new metabolic model for acetate uptake by a mixed culture of phosphate- and glycogen-accumulating organisms (PAOs and GAOs) under anaerobic conditions. The model uses variable overall stoichiometry based on the assumption that PAOs may have the ability of using the glyoxylate pathway to produce the required reducing power for polyhydroxyal-konate (PHA) synthesis. The proposed model was tested and verified by experimental results. A sequencing batch reactor system was operated for enhanced biological phosphorus removal (EBPR) with acetate as the sole carbon source at different influent acetate/phosphate ratios. The resulting experimental data supported the validity of the proposed model, indicating the presence of GAOs for all tested HAc/P ratios, especially under P-limiting conditions. Strong agreement is observed between experimental values and model predictions for all model components, namely, PHB production, PHA composition, glycogen utilization, and P release.

Original languageEnglish
Pages (from-to)359-373
Number of pages15
JournalBiotechnology and Bioengineering
Volume84
Issue number3
DOIs
Publication statusPublished - 5 Nov 2003

Keywords

  • Acetate uptake
  • Activated sludge
  • Biological phosphate removal
  • Glycogen
  • Glycogen-accumulating organism
  • Metabolic model
  • Phosphate-accumulating organism
  • Polyhydroxyalkonates

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