A model-based assessment of nitric oxide and nitrous oxide production in membrane-aerated autotrophic nitrogen removal biofilm systems

Ni, Bing-Jie and Yuan, Zhiguo (2013) A model-based assessment of nitric oxide and nitrous oxide production in membrane-aerated autotrophic nitrogen removal biofilm systems. Journal of Membrane Science, 428 163-171. doi:10.1016/j.memsci.2012.10.049


Author Ni, Bing-Jie
Yuan, Zhiguo
Title A model-based assessment of nitric oxide and nitrous oxide production in membrane-aerated autotrophic nitrogen removal biofilm systems
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
1873-3123
Publication date 2013-02-01
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.memsci.2012.10.049
Volume 428
Start page 163
End page 171
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2013
Language eng
Formatted abstract Oxygen limitation has been commonly recognized as an important factor causing nitric oxide (NO) and nitrous oxide (N2O) production. Due to the requirement of low oxygen conditions, membrane aerated autotrophic nitrogen removal biofilm systems that remove nitrogen through aerobic ammonia oxidation followed by Anammox may be prone to NO and N2O production. In this work, a mathematical model was constructed to assess the NO and N2O production potential in membrane aerated autotrophic biofilm under various operational conditions. The AOB-mediated denitrification pathway was used to model NO and N2O production. Simulations showed that a considerable amount of NO (0.2% of TN removed) and N2O (3.0% of TN removed) could be produced in membrane-aerated biofilm under operational conditions optimal for total nitrogen removal with 75% TN removal achieved. Both NO and N2O production is inherently related to TN removal in membrane aerated biofilm reactors (MABRs). NO and N2O production as well as total nitrogen removal depends on both the surface oxygen and ammonium loading rates. Biofilm thickness also has a significant effect on nitrogen removal and on NO and N2O production. An MABR would produce significantly less N2O in comparison to a conventional co-diffusional biofilm system under the same loadings of nitrogen and oxygen, due to the higher nitrite accumulation and outside distribution of AOB in the co-diffusional biofilm. Given the model structure is correct, high TN removal (>70%) with a relative low NO and N2O production (<1.0% of TN removed) in an MABR can be achieved by controlling the oxygen and ammonium surface loading at 2.0 g m−2 day−1 and 1.0 g m−2 day−1, respectively. These results provide useful support for the design and operation of MABRs.
Keyword Nitric oxide
Nitrous oxide
Ammonia-oxidizing bacteria (AOB)
Anammox
Modeling
Biofilm
Membrane aeration
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online5November2012

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
Advanced Water Management Centre Publications
 
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Created: Wed, 07 Nov 2012, 16:48:55 EST by Bing-Jie Ni on behalf of Advanced Water Management Centre