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Emissions of NO and N2O in wetland microcosms for swine wastewater treatment

Abstract

Nitric oxide (NO) and nitrous oxide (N2O) emitted from wetland systems contribute an important proportion to the global warming effect. In this study, four wetland microcosms vegetated with Myriophyllum elatinoides (WM), Alternanthera philoxeroides (WA), Eichhornia crassipes (WE), or without vegetation (NW) were compared to investigate the emissions of NO and N2O during nitrogen (N) removal process when treating swine wastewater. After 30-day incubation, TN removal rates of 96.4, 74.2, 97.2, and 47.3 % were observed for the WM, WA, WE, and NW microcosms, respectively. Yet, no significant difference was observed in WM and WE (p > 0.05). The average NO and N2O emissions in WE was significantly higher than those in WM, WA, and NW (p < 0.05). In addition, the emission of N2O in WE accounted for 2.10 % of initial TN load and 2.17 % of the total amount of TN removal, compared with less than 1 % in the other microcosms. These findings indicate that wetland vegetated with M. elatinoides may be an optimal system for swine wastewater treatment, based on its higher removal of N and lower emissions of NO and N2O.

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Acknowledgments

This study was financially supported by the key CAS Programs (KZZD-EW-11, KZZD-EW-10-5), the National Science and Technology Supporting Project (2014BAD14B00, 2012BAD14B17).

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Correspondence to Feng Liu or Jinshui Wu.

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Responsible editor: Philippe Garrigues

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Zhang, S., Liu, F., Xiao, R. et al. Emissions of NO and N2O in wetland microcosms for swine wastewater treatment. Environ Sci Pollut Res 22, 19933–19939 (2015). https://doi.org/10.1007/s11356-015-5210-3

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Keywords

  • Nitric oxide
  • Nitrous oxide
  • Greenhouse gas
  • N removal
  • Constructed wetland