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Oxygen-induced dynamics of nitrous oxide in water and off-gas during the treatment of digester supernatant.

Stenström, F; Tjus, K and la Cour Jansen, Jes LU (2014) In Water Science and Technology 69(1). p.84-91
Abstract
Nitrous oxide (N2O) is a potent greenhouse gas and of special concern in wastewater treatment. It is formed in biological wastewater treatment under both aerobic and anaerobic conditions. A major reason for high N2O emissions is low oxygen concentration during nitrification. In this full-scale study of N2O emissions from a sequencing batch reactor for treating digester supernatant, the oxygen concentration was reduced stepwise to investigate how N2O emissions were influenced. N2O concentrations were measured online in water and off-gas. A distinct relationship was found between low oxygen concentration and high N2O emissions. N2O was formed in water during both nitrification and denitrification. Decreased oxygen concentration during... (More)
Nitrous oxide (N2O) is a potent greenhouse gas and of special concern in wastewater treatment. It is formed in biological wastewater treatment under both aerobic and anaerobic conditions. A major reason for high N2O emissions is low oxygen concentration during nitrification. In this full-scale study of N2O emissions from a sequencing batch reactor for treating digester supernatant, the oxygen concentration was reduced stepwise to investigate how N2O emissions were influenced. N2O concentrations were measured online in water and off-gas. A distinct relationship was found between low oxygen concentration and high N2O emissions. N2O was formed in water during both nitrification and denitrification. Decreased oxygen concentration during nitrification led to increased nitrite concentration, which in turn led to increased N2O concentration in the subsequent denitrification phase. When the nitrification resumed, accumulated N2O was stripped off to the atmosphere. Very high concentrations of N2O, over 56,000 ppmv, were measured in the off-gas. Furthermore, the maximum amount of N2O emitted during one cycle corresponded to 107.6% of the total nitrogen load (21.9% of total nitrogen present in the bulk liquid at the beginning of the cycle). This is among the highest emission levels ever measured from a full-scale municipal plant for digester supernatant. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Water Science and Technology
volume
69
issue
1
pages
84 - 91
publisher
IWA Publishing
external identifiers
  • wos:000329913700012
  • pmid:24434972
  • scopus:84892727350
ISSN
0273-1223
DOI
10.2166/wst.2013.558
language
English
LU publication?
yes
id
27f83f9f-5427-4507-a7c4-6424930cd284 (old id 4291243)
date added to LUP
2014-02-24 12:11:20
date last changed
2017-09-03 04:01:51
@article{27f83f9f-5427-4507-a7c4-6424930cd284,
  abstract     = {Nitrous oxide (N2O) is a potent greenhouse gas and of special concern in wastewater treatment. It is formed in biological wastewater treatment under both aerobic and anaerobic conditions. A major reason for high N2O emissions is low oxygen concentration during nitrification. In this full-scale study of N2O emissions from a sequencing batch reactor for treating digester supernatant, the oxygen concentration was reduced stepwise to investigate how N2O emissions were influenced. N2O concentrations were measured online in water and off-gas. A distinct relationship was found between low oxygen concentration and high N2O emissions. N2O was formed in water during both nitrification and denitrification. Decreased oxygen concentration during nitrification led to increased nitrite concentration, which in turn led to increased N2O concentration in the subsequent denitrification phase. When the nitrification resumed, accumulated N2O was stripped off to the atmosphere. Very high concentrations of N2O, over 56,000 ppmv, were measured in the off-gas. Furthermore, the maximum amount of N2O emitted during one cycle corresponded to 107.6% of the total nitrogen load (21.9% of total nitrogen present in the bulk liquid at the beginning of the cycle). This is among the highest emission levels ever measured from a full-scale municipal plant for digester supernatant.},
  author       = {Stenström, F and Tjus, K and la Cour Jansen, Jes},
  issn         = {0273-1223},
  language     = {eng},
  number       = {1},
  pages        = {84--91},
  publisher    = {IWA Publishing},
  series       = {Water Science and Technology},
  title        = {Oxygen-induced dynamics of nitrous oxide in water and off-gas during the treatment of digester supernatant.},
  url          = {http://dx.doi.org/10.2166/wst.2013.558},
  volume       = {69},
  year         = {2014},
}