title: Distinctive denitrifying capabilities lead to differences in N2O production by denitrifying polyphosphate accumulating organisms and denitrifying glycogen accumulating organisms.
abstract: This study aims at investigating the denitrification kinetics in two separate enriched cultures of denitrifying polyphosphate accumulating organisms (dPAO) and denitrifying glycogen accumulating organisms (dGAO) and compare their N2O accumulation potential under different conditions. Two sequencing batch reactors were inoculated to develop dPAO and dGAO enriched microbial communities separately. Seven batch tests with different combinations of electron acceptors (nitrate, nitrite and/or nitrous oxide) were carried out with the enriched biomass from both reactors. Results indicate that in almost all batch tests, N2O accumulated for both cultures, however dPAOs showed a higher denitrification capacity compared to dGAOs due to their higher nitrogen oxides reduction rates. Additionally, the effect of the simultaneous presence of several electron acceptors in the reduction rates of the different nitrogen oxides was also assessed in dPAOs and dGAOs.
authors.affiliation: Catalan Institute for Water Research (ICRA), Scientific and Technological Park of the University of Girona, 17003 Girona, Spain.
authors.forename: Anna
authors.initials: A
authors.lastname: Ribera-Guardia
authors.affiliation: UCIBIO, REQUIMTE, Chemistry Department, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Marques
authors.affiliation: Catalan Institute for Water Research (ICRA), Scientific and Technological Park of the University of Girona, 17003 Girona, Spain; Dipartimento di ingegneria civile e architettura (DICAR), Università di Catania, 95100 Catania, Sicily, Italy.
authors.forename: Corrado
authors.initials: C
authors.lastname: Arangio
authors.affiliation: UCIBIO, REQUIMTE, Chemistry Department, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
authors.forename: Monica
authors.initials: M
authors.lastname: Carvalheira
authors.affiliation: UCIBIO, REQUIMTE, Chemistry Department, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
authors.forename: Adrian
authors.initials: A
authors.lastname: Oehmen
authors.affiliation: Catalan Institute for Water Research (ICRA), Scientific and Technological Park of the University of Girona, 17003 Girona, Spain. Electronic address: mpijuan@icra.cat.
authors.forename: Maite
authors.initials: M
authors.lastname: Pijuan
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D018533:Biomass; D019149:Bioreactors; D058440:Denitrification; D006003:Glycogen / Q000378:metabolism*; D007700:Kinetics; D009609:Nitrous Oxide / Q000378:metabolism*; D011122:Polyphosphates / Q000378:metabolism*; D062065:Wastewater / Q000382:microbiology*
chemical_list: D006003:Glycogen; D009609:Nitrous Oxide; D011122:Polyphosphates; D062065:Wastewater
keywords: Denitrification; Multiple electron acceptors; Nitrous oxide; dGAO; dPAO