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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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  1. Xiaoling Liu, Ke Zhang and Liangqian Fan contributed equally to this work.

Authors and Affiliations

  1. Sichuan Water Conservancy Vocational College, Chengdu, 611231, China

    Xiaoling Liu

  2. College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China

    Ke Zhang, Liangqian Fan & Hongbing Luo

  3. Sichuan Company of China Post Insurance, Chengdu, 610016, China

    Mingshu Jiang

  4. Department of Civil Engineering, Queen’s University, Kingston, K7L 3N6, Canada

    Bruce C. Anderson

  5. School of Urban and Rural Construction, Chengdu University, Chengdu, 610106, China

    Mei Li

  6. Campus of Dujiangyan, Sichuan Agricultural University, Chengdu, 611830, China

    Bo Huang, Lijuan Yu & Guozhu He

  7. College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, China

    Jingting Wang & Aiping Pu

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  1. Xiaoling Liu
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Correspondence to Hongbing Luo.

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Responsible editor: Philippe Garrigues

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.

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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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