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Modeling nitrous oxide production during biological nitrogen removal via nitrification and denitrification: extensions to the general ASM models.
- Source :
-
Environmental science & technology [Environ Sci Technol] 2011 Sep 15; Vol. 45 (18), pp. 7768-76. Date of Electronic Publication: 2011 Aug 29. - Publication Year :
- 2011
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Abstract
- Nitrous oxide (N(2)O) can be formed during biological nitrogen (N) removal processes. In this work, a mathematical model is developed that describes N(2)O production and consumption during activated sludge nitrification and denitrification. The well-known ASM process models are extended to capture N(2)O dynamics during both nitrification and denitrification in biological N removal. Six additional processes and three additional reactants, all involved in known biochemical reactions, have been added. The validity and applicability of the model is demonstrated by comparing simulations with experimental data on N(2)O production from four different mixed culture nitrification and denitrification reactor study reports. Modeling results confirm that hydroxylamine oxidation by ammonium oxidizers (AOB) occurs 10 times slower when NO(2)(-) participates as final electron acceptor compared to the oxic pathway. Among the four denitrification steps, the last one (N(2)O reduction to N(2)) seems to be inhibited first when O(2) is present. Overall, N(2)O production can account for 0.1-25% of the consumed N in different nitrification and denitrification systems, which can be well simulated by the proposed model. In conclusion, we provide a modeling structure, which adequately captures N(2)O dynamics in autotrophic nitrification and heterotrophic denitrification driven biological N removal processes and which can form the basis for ongoing refinements.
- Subjects :
- Bacteria metabolism
Computer Simulation
Hydroxylamine metabolism
Nitrogen metabolism
Quaternary Ammonium Compounds metabolism
Reproducibility of Results
Water Purification
Air Pollutants metabolism
Denitrification
Models, Biological
Nitrification
Nitrous Oxide metabolism
Waste Disposal, Fluid
Subjects
Details
- Language :
- English
- ISSN :
- 1520-5851
- Volume :
- 45
- Issue :
- 18
- Database :
- MEDLINE
- Journal :
- Environmental science & technology
- Publication Type :
- Academic Journal
- Accession number :
- 21780759
- Full Text :
- https://doi.org/10.1021/es201489n