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N2O and NO emissions from a partial nitrification sequencing batch reactor: Exploring dynamics, sources and minimization mechanisms

A sequencing batch reactor (SBR) was enriched with ammonia oxidizing bacteria (AOB) in order to treat synthetic reject wastewater (1g NH4+-N/L). Partial nitrification was successfully achieved at a NH4+-N to NO2--N conversion rate of 98%. The emission dynamics of nitrous oxide (N2O) and nitric oxide (NO) were monitored during normal operation and under 3 different cycle configurations. An N2O peak was detected during the first 5min of the cycle in all cases which corresponded to 60-80% of the total N2O emitted. When anoxic phases were introduced, N2O emissions were minimized but NO increased. Factors affecting the initial N2O peak were studied in a set of individual experiments. It was concluded that most of this N2O originated during settling due to biological reactions. Complete oxidation of NH4+ (or most likely hydroxylamine) as a result of sufficient aeration time can be a minimization strategy for N2O emissions in partial nitrification systems

This study was funded by the Spanish Government, Ministerio de Economı´a y Competitividad (project CTM 2011-27163) and the European Commission FP7-PEOPLE-2011-CIG 303946 project. M. Pijuan also acknowledges the Ramon y Cajal research fellowship (RYC-2009-04959) provided by the Spanish Government

© Water Research, 2013, vol. 47, núm. 9, p. 3131-3140

Elsevier

Author: Rodríguez-Caballero, Adrián
Pijuan i Vilalta, Maite
Date: 2013 June 1
Abstract: A sequencing batch reactor (SBR) was enriched with ammonia oxidizing bacteria (AOB) in order to treat synthetic reject wastewater (1g NH4+-N/L). Partial nitrification was successfully achieved at a NH4+-N to NO2--N conversion rate of 98%. The emission dynamics of nitrous oxide (N2O) and nitric oxide (NO) were monitored during normal operation and under 3 different cycle configurations. An N2O peak was detected during the first 5min of the cycle in all cases which corresponded to 60-80% of the total N2O emitted. When anoxic phases were introduced, N2O emissions were minimized but NO increased. Factors affecting the initial N2O peak were studied in a set of individual experiments. It was concluded that most of this N2O originated during settling due to biological reactions. Complete oxidation of NH4+ (or most likely hydroxylamine) as a result of sufficient aeration time can be a minimization strategy for N2O emissions in partial nitrification systems
This study was funded by the Spanish Government, Ministerio de Economı´a y Competitividad (project CTM 2011-27163) and the European Commission FP7-PEOPLE-2011-CIG 303946 project. M. Pijuan also acknowledges the Ramon y Cajal research fellowship (RYC-2009-04959) provided by the Spanish Government
Format: application/pdf
ISSN: 0043-1354 (versió paper)
1879-2448 (versió electrònica)
Document access: http://hdl.handle.net/10256/12576
Language: eng
Publisher: Elsevier
Collection: MINECO/PN 2011-2014/CTM2011-27163
MICINN/PN 2009/RYC-2009-04959
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.watres.2013.03.019
Articles publicats (ICRA)
info:eu-repo/grantAgreement/EC/FP7/303946
Is part of: © Water Research, 2013, vol. 47, núm. 9, p. 3131-3140
Rights: Tots els drets reservats
Subject: Nitrificació
Nitrification
Aigües residuals -- Anàlisi
Sewage -- nalysis
Bioreactors
Aigües residuals -- Depuració -- Oxidació
Sewage -- Purification -- Oxidation
Title: N2O and NO emissions from a partial nitrification sequencing batch reactor: Exploring dynamics, sources and minimization mechanisms
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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