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Effect of process parameters and operational mode on nitrous oxide emissions from a nitritation reactor treating reject wastewater

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 1-4.5mgO2/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 (>5mgO2/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

AGAUR and ACC1Ó (Secretaria d’Universitats i Recerca del Departament d’Economia i Coneixement de la Generalitat de Catalunya), 2010VALOR0096, Ministerio de Economía y Competitividad (projects CTM 2011-27163 and CTQ2011-24745/PPQ) and the European Commission FP7-PEOPLE-2011-CIG 303946

Elsevier

Manager: Ministerio de Economía y Competitividad (Espanya)
Author: Pijuan i Vilalta, Maite
Torà, Josep
Rodríguez-Caballero, Adrián
César, Elvira
Carrera, Julián
Pérez, Julio
Abstract: 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 1-4.5mgO2/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 (>5mgO2/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
AGAUR and ACC1Ó (Secretaria d’Universitats i Recerca del Departament d’Economia i Coneixement de la Generalitat de Catalunya), 2010VALOR0096, Ministerio de Economía y Competitividad (projects CTM 2011-27163 and CTQ2011-24745/PPQ) and the European Commission FP7-PEOPLE-2011-CIG 303946
Document access: http://hdl.handle.net/2072/297966
Language: eng
Publisher: Elsevier
Rights: Tots els drets reservats
Subject: Aigües residuals -- Depuració -- Desnitrificació
Sewage -- Purification -- Nitrogen removal
Aigües residuals -- Depuració -- Tractament biològic
Sewage -- Purification -- Biological treatment
Title: Effect of process parameters and operational mode on nitrous oxide emissions from a nitritation reactor treating reject wastewater
Type: info:eu-repo/semantics/article
Repository: Recercat

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