Hypoxia remediation and methane emission manipulation using surface oxygen nanobubbles

Shi, W., Pan, G. ORCID: 0000-0003-0920-3018, Chen, Q., Song, L., Zhu, L. and Ji, X., 2018. Hypoxia remediation and methane emission manipulation using surface oxygen nanobubbles. Environmental Science & Technology, 52 (15), pp. 8712-8717. ISSN 0013-936X

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Algal blooms in eutrophic waters often induce anoxia/hypoxia and enhance methane (CH4) emissions to the atmosphere, which may contribute to global warming. At present, there are very few strategies available to combat this problem. In this study, surface oxygen nanobubbles were tested as a novel approach for anoxia/hypoxia remediation and CH4 emission control. Incubation column experiments were conducted using sediment and water samples taken from Lake Taihu, China. The results indicated that algae-induced anoxia/hypoxia could be reduced or reversed after oxygen nanobubbles were loaded onto zeolite microporous and delivered to anoxic sediment. Cumulated CH4 emissions were also reduced by a factor of 3.2 compared to the control. This was mainly attributed to the manipulation of microbial processes using the surface oxygen nanobubbles, which potentially served as oxygen suppliers. The created oxygen enriched environment simultaneously decreased methanogen but increased methanotroph abundances, making a greater fraction of organic carbon recycled as carbon dioxide (CO2) instead of CH4. The CH4/CO2 emission ratio decreased to 3.4 × 10-3 in the presence of oxygen nanobubbles, compared with 11 × 10-3 in the control, and therefore the global warming potential was reduced. This study proposes a possible strategy for anoxia/hypoxia remediation and CH4 emission control in algal bloom waters, which may benefit global warming mitigation.

Item Type: Journal article
Publication Title: Environmental Science & Technology
Creators: Shi, W., Pan, G., Chen, Q., Song, L., Zhu, L. and Ji, X.
Publisher: ACS Publications
Date: 7 August 2018
Volume: 52
Number: 15
ISSN: 0013-936X
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Record created by: Jill Tomkinson
Date Added: 03 Aug 2018 10:43
Last Modified: 22 Jan 2021 09:32
URI: https://irep.ntu.ac.uk/id/eprint/34241

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