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Intermittent micro-aeration control of methane emissions from an integrated vertical-flow constructed wetland during agricultural domestic wastewater treatment

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Abstract

It is very important to control methane emissions to mitigate global warming. An intermittent micro-aeration control system was used to control methane emissions from an integrated vertical-flow constructed wetland (IVCW) to treat agricultural domestic wastewater pollution in this study. The optimized intermittent micro-aeration conditions were a 20-min aeration time and 340-min non-aeration time, 3.9 m3 h−1 aeration intensity, evenly distributed micro-aeration diffusers at the tank bottom, and an aeration period of every 6 h. Methane flux emission by intermittent micro-aeration was decreased by 60.7% under the optimized conditions. The average oxygen transfer efficiency was 26.73%. The control of CH4 emission from IVCWs was most strongly influenced by the intermittent micro-aeration diffuser distribution, followed by aeration intensity, aeration time, and water depth. Scaling up of IVCWs is feasible in rural areas by using intermittent micro-aeration control as a mitigation measure for methane gas emissions for climate change.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51278318), the Chengdu Science & Technology Bureau (2015-HM01-00325-SF), the Science and Technology Department of Sichuan Province (18ZDYF3209), and the State Key Laboratory of Hydraulics and Mountain River Engineering in China (SKHL1716).

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Correspondence to Hongbing Luo.

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Research highlights

• Optimal intermittent micro-aeration control of CH4 emission from integrated vertical flow constructed wetlands (IVCWs): 20 min aeration time, 340 min interruption time, 3.9 m3 h−1 aeration intensity, and every 6 h as an aeration operation period.

• Controlled condition on CH4 emission in IVCWs were the order of the intermittent micro-aeration diffuser distributions at the tank bottom > the aeration intensity (m3 h−1) > the aeration time (minutes) > the water tables.

• Averagely distributed micro-aeration diffusers was less CH4 emission than the middle intensively distributed micro-aeration diffusers at the tank bottom.

Responsible editor: Philippe Garrigues

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Liu, X., Zhang, K., Fan, L. et al. Intermittent micro-aeration control of methane emissions from an integrated vertical-flow constructed wetland during agricultural domestic wastewater treatment. Environ Sci Pollut Res 25, 24426–24444 (2018). https://doi.org/10.1007/s11356-018-2226-5

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Keywords

  • Intermittent micro-aeration
  • Integrated vertical-flow constructed wetland
  • Control of methane emissions
  • Oxygen transfer efficiency
  • Cyperus alternifolius L.