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Coupling of partial nitrification and aerated vertical flow constructed wetland for enhancing nitrite removal and reducing nitrous oxide
- Source :
- Journal of Environmental Chemical Engineering; February 2023, Vol. 11 Issue: 1
- Publication Year :
- 2023
-
Abstract
- High nitrous oxide (N2O) and nitrite (NO2--N) emission limit the application of the partial nitrification (PN) technology. A novel aerated vertical flow constructed wetland (VFCW) using waste gas from PN process was designed to enhance nitrogen removal and reduce N2O and NO2--N in PN process. Compared with unaerated VFCW, NH4+-N and TN removal efficiencies in aerated VFCW were significantly improved by 118.48% and 78.14%, respectively. Furthermore, the aerated wetland mode can effectively eliminate the problem of high NO2--N and N2O pollution. After VFCW purification, the NO2--N concentration was reduced from 17.07 mg/L to 0.34 mg/L. Meanwhile, the N2O removal rate could reach 88.72%. Microbial analysis showed that the higher microbial community abundance and more fully nitrification and denitrification process were found in aerated VFCW, led to its reduced NO2--N and N2O emission.
Details
- Language :
- English
- ISSN :
- 22132929 and 22133437
- Volume :
- 11
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Journal of Environmental Chemical Engineering
- Publication Type :
- Periodical
- Accession number :
- ejs61372698
- Full Text :
- https://doi.org/10.1016/j.jece.2022.109114