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Página principal > Artículos > Artículos publicados > Effect of process parameters and operational mode on nitrous oxide emissions from a nitritation reactor treating reject wastewater |
Fecha: | 2014 |
Resumen: | 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. |
Ayudas: | 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. |
Derechos: | Tots els drets reservats. |
Lengua: | Anglès |
Documento: | Article ; recerca ; Versió acceptada per publicar |
Materia: | Partial nitrification ; Reject wastewater ; Nitrous oxide emissions ; Continuous vs discontinuous operation ; Economical analysis |
Publicado en: | Water research, Vol. 49 (Feb. 2014) , p. 23-33, ISSN 0043-1354 |
Post-print 38 p, 1.7 MB |