The selective role of nitrite in the PAO/GAO competition
Tayà Cristellys, Carlota (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Garlapati, Vijay Kumar (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Guisasola, Albert (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Baeza Labat, Juan Antonio (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)

Date:	2013
Abstract:	Proliferation of Glycogen Accumulating Organisms (GAOs) accounts as one of the major bottlenecks in biological phosphorus removal systems. GAO outcompeting polyphosphate accumulating organisms (PAOs) results in lower P-removal. Thus, finding optimal conditions that favour PAO in front of GAO is a current focus of research. This work shows how nitrite can provide a novel strategy for PAO enrichment. A propionate-fed GAO- nriched biomass (70% Defluviicoccus I, 18% Defluviicoccus II and 10% PAO) was subjected more than 50 d under anaerobic-anoxic conditions with nitrite as electron acceptor. These operational conditions led to a PAO-enriched sludge (85%) where GAO were washed out of the system (<10%), demonstrating the validity of the new approach for PAO enrichment. In addition, the presented suppression of Defluviicocus GAO with nitrite represents an add-on benefit to the nitrite-based systems since the proliferation of non-desirable GAO can be easily ruled out and added to the other benefits (i. e. lower aeration and COD requirements).
Grants:	Ministerio de Ciencia e Innovación CTM2010-20384 Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-815
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Enhanced biological phosphorus removal (EBPR) ; Nitrite ; Selection ; Polyphosphate accumulating organisms (PAOs) ; Glycogen Accumulating Organisms (GAOs)
Published in:	Chemosphere, Vol. 93, issue 4 (Oct. 2013) , p. 612-618, ISSN 1879-1298

DOI: 10.1016/j.chemosphere.2013.06.006

Post-print 33 p, 1.6 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Engineering > GENOCOV
Articles > Research articles
Articles > Published articles