Improving water quality and mitigating CH4 and N2O production in urban landscape water simultaneously by optimizing calcium peroxide dosage
Improving water quality and mitigating CH4 and N2O production in urban landscape water simultaneously by optimizing calcium peroxide dosage
Recent studies show that greenhouse gas (GHG) emissions from urban landscape water are significant and cannot be overlooked, underscoring the need to develop effective strategies for mitigating GHG production from global freshwater systems. Calcium peroxide (CaO2) is commonly used as an eco-friendly reagent for controlling eutrophication in water bodies, but whether CaO2 can reduce GHG emissions remains unclear. This study investigated the effects of CaO2 dosage on the production of methane (CH4) and nitrous oxide (N2O) in urban landscape water under anoxic conditions during summer. The findings reveal that CaO2 addition not only improved the physicochemical and organoleptic properties of simulated urban landscape water but also reduced N2O production by inhibiting the activity of denitrifying bacteria across various dosages. Moreover, CaO2 exhibited selective effects on methanogens. Specifically, the abundance of acetoclastic methanogen Methanosaeta and methylotrophic methanogen Candidatus_Methanofastidiosum increased whereas the abundance of the hydrogenotrophic methanogen Methanoregula decreased at low, medium, and high dosages, leading to higher CH4 production at increased CaO2 dosage. A comprehensive multi-objective evaluation indicated that an optimal dosage of 60 g CaO2/m2 achieved 41.21 % and 84.40 % reductions in CH4 and N2O production, respectively, over a 50-day period compared to the control. This paper not only introduces a novel approach for controlling the production of GHGs, such as CH4 and N2O, from urban landscape water but also suggests a methodology for optimizing CaO2 dosage, providing valuable insights for its practical application.
Active control, Calcium peroxide, Potent greenhouse gas production, Urban landscape water
Liang, Zhen-Hao
22ac35dd-28a1-47e8-adf9-0382a5cdd5eb
Wang, Yi
9634949d-9d50-44b6-864f-bb0e85b577fd
Zhao, Hui-Ying
a1560e13-73c0-44f7-b310-627f3d68541f
Fu, Tian-Tian
2bc43cfb-7533-4bfd-bf96-f716107e39fd
Liu, Yong-Qiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Zhang, Kai
89aac095-62bb-4ffc-8bce-cbcdd32434c9
Wang, Yue-Ning
310a1a04-c220-40cc-9c25-8bec327d04f9
Ouyang, Hui-Long
01de5ac1-9465-42c7-a73c-fff0cc4f7511
Yin, Jia-Ni
2b30c6fc-cea4-4852-a667-0d1f3f65098d
9 April 2024
Liang, Zhen-Hao
22ac35dd-28a1-47e8-adf9-0382a5cdd5eb
Wang, Yi
9634949d-9d50-44b6-864f-bb0e85b577fd
Zhao, Hui-Ying
a1560e13-73c0-44f7-b310-627f3d68541f
Fu, Tian-Tian
2bc43cfb-7533-4bfd-bf96-f716107e39fd
Liu, Yong-Qiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Zhang, Kai
89aac095-62bb-4ffc-8bce-cbcdd32434c9
Wang, Yue-Ning
310a1a04-c220-40cc-9c25-8bec327d04f9
Ouyang, Hui-Long
01de5ac1-9465-42c7-a73c-fff0cc4f7511
Yin, Jia-Ni
2b30c6fc-cea4-4852-a667-0d1f3f65098d
Liang, Zhen-Hao, Wang, Yi, Zhao, Hui-Ying, Fu, Tian-Tian, Liu, Yong-Qiang, Zhang, Kai, Wang, Yue-Ning, Ouyang, Hui-Long and Yin, Jia-Ni
(2024)
Improving water quality and mitigating CH4 and N2O production in urban landscape water simultaneously by optimizing calcium peroxide dosage.
Science of the Total Environment, 927, [172270].
(doi:10.1016/j.scitotenv.2024.172270).
Abstract
Recent studies show that greenhouse gas (GHG) emissions from urban landscape water are significant and cannot be overlooked, underscoring the need to develop effective strategies for mitigating GHG production from global freshwater systems. Calcium peroxide (CaO2) is commonly used as an eco-friendly reagent for controlling eutrophication in water bodies, but whether CaO2 can reduce GHG emissions remains unclear. This study investigated the effects of CaO2 dosage on the production of methane (CH4) and nitrous oxide (N2O) in urban landscape water under anoxic conditions during summer. The findings reveal that CaO2 addition not only improved the physicochemical and organoleptic properties of simulated urban landscape water but also reduced N2O production by inhibiting the activity of denitrifying bacteria across various dosages. Moreover, CaO2 exhibited selective effects on methanogens. Specifically, the abundance of acetoclastic methanogen Methanosaeta and methylotrophic methanogen Candidatus_Methanofastidiosum increased whereas the abundance of the hydrogenotrophic methanogen Methanoregula decreased at low, medium, and high dosages, leading to higher CH4 production at increased CaO2 dosage. A comprehensive multi-objective evaluation indicated that an optimal dosage of 60 g CaO2/m2 achieved 41.21 % and 84.40 % reductions in CH4 and N2O production, respectively, over a 50-day period compared to the control. This paper not only introduces a novel approach for controlling the production of GHGs, such as CH4 and N2O, from urban landscape water but also suggests a methodology for optimizing CaO2 dosage, providing valuable insights for its practical application.
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Accepted/In Press date: 4 April 2024
e-pub ahead of print date: 5 April 2024
Published date: 9 April 2024
Keywords:
Active control, Calcium peroxide, Potent greenhouse gas production, Urban landscape water
Identifiers
Local EPrints ID: 490839
URI: http://eprints.soton.ac.uk/id/eprint/490839
ISSN: 0048-9697
PURE UUID: 953d949c-a44d-46cf-accc-90d5e7d76f79
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Date deposited: 06 Jun 2024 17:16
Last modified: 08 Jun 2024 01:46
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Contributors
Author:
Zhen-Hao Liang
Author:
Yi Wang
Author:
Hui-Ying Zhao
Author:
Tian-Tian Fu
Author:
Kai Zhang
Author:
Yue-Ning Wang
Author:
Hui-Long Ouyang
Author:
Jia-Ni Yin
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