Back to Search
Start Over
Modeling electron competition among nitrogen oxides reduction and N 2 O accumulation in hydrogenotrophic denitrification.
- Source :
-
Biotechnology and bioengineering [Biotechnol Bioeng] 2018 Apr; Vol. 115 (4), pp. 978-988. Date of Electronic Publication: 2018 Jan 08. - Publication Year :
- 2018
-
Abstract
- Hydrogenotrophic denitrification is a novel and sustainable process for nitrogen removal, which utilizes hydrogen as electron donor, and carbon dioxide as carbon source. Recent studies have shown that nitrous oxide (N <subscript>2</subscript> O), a highly undesirable intermediate and potent greenhouse gas, can accumulate during this process. In this work, a new mathematical model is developed to describe nitrogen oxides dynamics, especially N <subscript>2</subscript> O, during hydrogenotrophic denitrification for the first time. The model describes electron competition among the four steps of hydrogenotrophic denitrification through decoupling hydrogen oxidation and nitrogen reduction processes using electron carriers, in contrast to the existing models that couple these two processes and also do not consider N <subscript>2</subscript> O accumulation. The developed model satisfactorily describes experimental data on nitrogen oxides dynamics obtained from two independent hydrogenotrophic denitrifying cultures under various hydrogen and nitrogen oxides supplying conditions, suggesting the validity and applicability of the model. The results indicated that N <subscript>2</subscript> O accumulation would not be intensified under hydrogen limiting conditions, due to the higher electron competition capacity of N <subscript>2</subscript> O reduction in comparison to nitrate and nitrite reduction during hydrogenotrophic denitrification. The model is expected to enhance our understanding of the process during hydrogenotrophic denitrification and the ability to predict N <subscript>2</subscript> O accumulation.<br /> (© 2017 Wiley Periodicals, Inc.)
- Subjects :
- Carbon Dioxide chemistry
Carbon Dioxide metabolism
Hydrogen chemistry
Hydrogen metabolism
Molecular Dynamics Simulation
Nitrates chemistry
Nitrates metabolism
Nitrites chemistry
Nitrites metabolism
Nitrogen Oxides chemistry
Nitrous Oxide chemistry
Oxidation-Reduction
Reproducibility of Results
Denitrification
Electrons
Models, Theoretical
Nitrogen Oxides metabolism
Nitrous Oxide metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1097-0290
- Volume :
- 115
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Biotechnology and bioengineering
- Publication Type :
- Academic Journal
- Accession number :
- 29240225
- Full Text :
- https://doi.org/10.1002/bit.26512