Document Detail

Metabolic model for glycogen-accumulating organisms in anaerobic/aerobic activated sludge systems.
MedLine Citation:
PMID:  12432585     Owner:  NLM     Status:  MEDLINE    
Glycogen-accumulating organisms (GAO) have the potential to directly compete with polyphosphate-accumulating organisms (PAO) in EBPR systems as both are able to take up VFA anaerobically and grow on the intracellular storage products aerobically. Under anaerobic conditions GAO hydrolyse glycogen to gain energy and reducing equivalents to take up VFA and to synthesise polyhydroxyalkanoate (PHA). In the subsequent aerobic stage, PHA is being oxidised to gain energy for glycogen replenishment (from PHA) and for cell growth. This article describes a complete anaerobic and aerobic model for GAO based on the understanding of their metabolic pathways. The anaerobic model has been developed and reported previously, while the aerobic metabolic model was developed in this study. It is based on the assumption that acetyl-CoA and propionyl-CoA go through the catabolic and anabolic processes independently. Experimental validation shows that the integrated model can predict the anaerobic and aerobic results very well. It was found in this study that at pH 7 the maximum acetate uptake rate of GAO was slower than that reported for PAO in the anaerobic stage. On the other hand, the net biomass production per C-mol acetate added is about 9% higher for GAO than for PAO. This would indicate that PAO and GAO each have certain competitive advantages during different parts of the anaerobic/aerobic process cycle.
Raymond J Zeng; Mark C M van Loosdrecht; Zhiguo Yuan; Jürg Keller
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Biotechnology and bioengineering     Volume:  81     ISSN:  0006-3592     ISO Abbreviation:  Biotechnol. Bioeng.     Publication Date:  2003 Jan 
Date Detail:
Created Date:  2002-11-14     Completed Date:  2003-05-28     Revised Date:  2006-04-19    
Medline Journal Info:
Nlm Unique ID:  7502021     Medline TA:  Biotechnol Bioeng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  92-105     Citation Subset:  IM    
Copyright Information:
Copyright 2002 Wiley Periodicals, Inc.
Advanced Wastewater Management Centre (AWMC), The University of Queensland, St. Lucia, Brisbane 4072, Australia.
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MeSH Terms
Acyl Coenzyme A / metabolism
Glycogen / metabolism*
Models, Biological*
Reg. No./Substance:
0/Acyl Coenzyme A; 0/Sewage; 317-66-8/propionyl-coenzyme A; 9005-79-2/Glycogen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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