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- Title
Effects and mechanisms of constructed wetlands with different substrates on N<sub>2</sub>O emission in wastewater treatment.
- Authors
Huo, Junyu; Hu, Xiaojin; Cheng, Shiyi; Xie, Huijun; Hu, Zhen; Wu, Haiming; Liang, Shuang
- Abstract
Nitrous oxide (N2O) emissions from constructed wetlands (CWs) are accompanying problems and have attracted much attention in recent years. CWs filled with different substrates (gravel, biochar, zeolite, and pyrite) were constructed to investigate the nitrogen removal performance and N2O emissions, which named C-CWs, B-CWs, Z-CWs, and P-CWs, respectively. C-CWs showed the poorest nitrogen removal performance in all CWs. Although B-CWs exhibited the highest fluxes of N2O emissions, the percentage of N2O emissions in nitrogen removal (0.15%) was smaller than that of C-CWs (0.18%). In addition, microbiological analysis showed that compared with C-CWs, CWs filled with biochar, zeolite, and pyrite had higher abundance of nitrifying and denitrifying microorganisms and lower abundance of N2O producing bacteria. In conclusion, biochar, zeolite, and pyrite were more favorable kinds of substrate than the conventional substrates of gravel for the nitrogen removal and reduction of N2O emissions from CWs.
- Subjects
CONSTRUCTED wetlands; WASTEWATER treatment; NITROUS oxide; BIOCHAR; ZEOLITES; PYRITES
- Publication
Environmental Science & Pollution Research, 2022, Vol 29, Issue 13, p19045
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-021-17219-6