Effect of process parameters and operational mode on nitrous oxide emissions from a nitritation reactor treating reject wastewater
Pijuan Vilalta, Maite (Institut Català de Recerca de l'Aigua)
Torà Suárez, Josep Anton (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Rodríguez-Caballero, Adrián (Institut Català de Recerca de l'Aigua)
César, Elvira (Depuración de Aguas del Mediterráneo)
Carrera, Julian (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Pérez Cañestro, Julio (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)

Data:	2014
Resum:	Nitrous oxide (N₂O) and methane emissions were monitored in a continuous granular airlift nitritation reactor from ammonium-rich wastewater (reject wastewater). N₂O emissions were found to be dependent on dissolved oxygen (DO) concentration in the range of 1-4. 5 mg O₂/L, increasing within this range when reducing the DO values. At higher DO concentrations, N₂O emissions remained constant at 2. 2% of the N oxidized to nitrite, suggesting two different mechanisms behind N₂O production, one dependent and one independent of DO concentration. Changes on ammonium, nitrite, free ammonia and free nitrous acid concentrations did not have an effect on N₂O emissions within the concentration range tested. When operating the reactor in a sequencing batch mode under high DO concentration (>5 mg o₂/L), N₂O emissions increased one order of magnitude reaching values of 19. 3+/-7. 5% of the N oxidized. Moreover, CH₄ emissions detected were due to the stripping of the soluble CH4 that remained dissolved in the reject wastewater after anaerobic digestion. Finally, an economical and carbon footprint assessment of a theoretical scaled up of the pilot plant was conducted.
Ajuts:	European Commission 303946 Ministerio de Economía y Competitividad CTM2011-27163 Ministerio de Economía y Competitividad CTQ2011-24745/PPQ
Nota:	Funding: AGAUR and ACC1Ó (Secretaria d'Universitats i Recerca del Departament d'Economia i Coneixement de la Generalitat de Catalunya), 2010VALOR0096. The authors thank Eduard Moliné (DAM) for helpful discussions during the course of the research. M. Pijuan also acknowledges the Ramon y Cajal research fellowship (RYC-2009-04959) provided by the Spanish Government.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Partial nitrification ; Reject wastewater ; Nitrous oxide emissions ; Continuous vs discontinuous operation ; Economical analysis
Publicat a:	Water research, Vol. 49 (Feb. 2014) , p. 23-33, ISSN 0043-1354

DOI: 10.1016/j.watres.2013.11.009

Post-print 38 p, 1.7 MB

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