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Metabolic model for acetate uptake by a mixed culture of phosphate‐ and glycogen‐accumulating organisms under anaerobic conditions
Author(s) -
Yagci Nevin,
Artan Nazik,
Çokgör Emine Ubay,
Randall Clifford W.,
Orhon Derin
Publication year - 2003
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.10765
Subject(s) - enhanced biological phosphorus removal , glyoxylate cycle , phosphate , chemistry , anaerobic exercise , glycogen , biochemistry , phosphorus , sequencing batch reactor , activated sludge model , metabolism , biology , activated sludge , sewage treatment , organic chemistry , environmental engineering , environmental science , physiology
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 polyhydroxyalkonate (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. © 2003 Wiley Periodicals, Inc. Biotechnol Bioeng 84: 359–373, 2003.