Competition between polyphosphate and glycogen accumulating organisms in enhanced biological phosphorus removal systems with acetate and propionate as carbon sources


Autoria(s): Oehmen, Adrian; Saunders, Aaron M.; Vives, M. Teresa; Yuan, Zhiguo; Keller, Jurg
Contribuinte(s)

A. Puehler

Data(s)

01/01/2006

Resumo

Enhanced biological phosphorus removal (EBPR) is a widely used process for achieving phosphorus removal from wastewater. A potential reason for EBPR failure is the undesirable growth of glycogen accumulating organisms (GAOs), which can compete for carbon sources with the bacterial group responsible for phosphorus removal from wastewater: the polyphosphate accumulating organisms (PAOs). This study investigates the impact of carbon source on EBPR performance and the competition between PAOs and GAOs. Two sequencing batch reactors (SBRs) were operated during a 4-6 month period and fed with a media containing acetate or propionate, respectively, as the sole carbon source. It was found that the acetate fed SBR rarely achieved a high level of phosphorus removal, and that a large portion of the microbial community was comprised of Candidatus Competibacter phosphatis, a known GAO. The propionate fed SBR, however, achieved stable phosphorus removal throughout the study, apart from one brief disturbance. The bacterial community of the propionate fed SBR was dominated by Candidatus Accumulibacter phosphatis, a known PAO, and did not contain Competibacter In a separate experiment, another SBR was seeded with a mixture of PAOs and a group of alphaproteobacterial GAOs, both enriched with propionate as the sole carbon source. Stable EBPR was achieved and the PAO population increased while the GAOs appeared to be out-competed. The results of this paper suggest that propionate may provide PAOs with a selective advantage over GAOs in the PAO-GAO competition, particularly through the minimisation of Competibacter Propionate may be a more suitable substrate than acetate for enhancing phosphorus removal in EBPR systems. (c) 2005 Elsevier B.V. All rights reserved.

Identificador

http://espace.library.uq.edu.au/view/UQ:79753

Idioma(s)

eng

Publicador

Elsevier Science Bv

Palavras-Chave #Biotechnology & Applied Microbiology #Enhanced Biological Phosphorus Removal (ebpr) #glycogen accumulating organisms (GAOs) #Glycogen Accumulating Organisms (gaos) #propionate #Propionate #Microbial Competition #In-situ Identification #Activated-sludge Processes #Anaerobic Conditions #Phosphate Removal #Metabolic Model #Microbial Community #Stoichiometry #Optimization #Bacterium #Reactor #C1 #299999 Engineering and Technology not elsewhere classified #779999 Other
Tipo

Journal Article