Nitrogen removal by algal-bacterial consortium during mainstream wastewater treatment: transformation mechanisms and potential N₂O mitigation

This work investigated nitrogen transformation pathways of the algal-bacterial consortium as well as its potential in reducing nitrous oxide (N2O) emission in enclosed, open and aerated reactors. The results confirmed the superior ammonium removal performance of the algal-bacterial consortium relati...

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Main Authors: Li, Qi, Xu, Yifeng, Liang, Chuanzhou, Peng, Lai, Zhou, Yan
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/172056
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1720562023-11-21T01:56:18Z Nitrogen removal by algal-bacterial consortium during mainstream wastewater treatment: transformation mechanisms and potential N₂O mitigation Li, Qi Xu, Yifeng Liang, Chuanzhou Peng, Lai Zhou, Yan School of Civil and Environmental Engineering Engineering::Environmental engineering Enhanced Nitrogen Removal Nitrogen Assimilation by Algae This work investigated nitrogen transformation pathways of the algal-bacterial consortium as well as its potential in reducing nitrous oxide (N2O) emission in enclosed, open and aerated reactors. The results confirmed the superior ammonium removal performance of the algal-bacterial consortium relative to the single algae (Chlorella vulgaris) or the activated sludge, achieving the highest efficiency at 100% and the highest rate of 7.34 mg N g MLSS-1 h-1 in the open reactor with glucose. Enhanced total nitrogen (TN) removal (to 74.6%) by the algal-bacterial consortium was achieved via mixotrophic algal assimilation and bacterial denitrification under oxygen-limited and glucose-sufficient conditions. Nitrogen distribution indicated that ammonia oxidation (∼41.8%) and algal assimilation (∼43.5%) were the main pathways to remove ammonium by the algal-bacterial consortium. TN removal by the algal-bacterial consortium was primarily achieved by algal assimilation (28.1-40.8%), followed by bacterial denitrification (2.9-26.5%). Furthermore, the algal-bacterial consortium contributed to N2O mitigation compared with the activated sludge, reducing N2O production by 35.5-55.0% via autotrophic pathways and by 81.0-93.6% via mixotrophic pathways. Nitrogen assimilation by algae was boosted with the addition of glucose and thus largely restrained N2O production from nitrification and denitrification. The synergism between algae and bacteria was also conducive to an enhanced N2O reduction by denitrification and reduced direct/indirect carbon emissions. The authors thank the National Natural Science Foundation of China (No. 52100061 and No. 51908436), the Natural Science Foundation of Guangdong Province (No. 2019A1515110350), Hubei Provincial Key Research and Development Program (No. 2022BCA067) and Hubei Key Laboratory of Mineral Resources Processing and Environment (Wuhan University of Technology) (No. ZHJJ202006) for supporting this study. 2023-11-21T00:45:45Z 2023-11-21T00:45:45Z 2023 Journal Article Li, Q., Xu, Y., Liang, C., Peng, L. & Zhou, Y. (2023). Nitrogen removal by algal-bacterial consortium during mainstream wastewater treatment: transformation mechanisms and potential N₂O mitigation. Water Research, 235, 119890-. https://dx.doi.org/10.1016/j.watres.2023.119890 0043-1354 https://hdl.handle.net/10356/172056 10.1016/j.watres.2023.119890 36958220 2-s2.0-85150465323 235 119890 en Water Research © 2023 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Environmental engineering
Enhanced Nitrogen Removal
Nitrogen Assimilation by Algae
spellingShingle Engineering::Environmental engineering
Enhanced Nitrogen Removal
Nitrogen Assimilation by Algae
Li, Qi
Xu, Yifeng
Liang, Chuanzhou
Peng, Lai
Zhou, Yan
Nitrogen removal by algal-bacterial consortium during mainstream wastewater treatment: transformation mechanisms and potential N₂O mitigation
description This work investigated nitrogen transformation pathways of the algal-bacterial consortium as well as its potential in reducing nitrous oxide (N2O) emission in enclosed, open and aerated reactors. The results confirmed the superior ammonium removal performance of the algal-bacterial consortium relative to the single algae (Chlorella vulgaris) or the activated sludge, achieving the highest efficiency at 100% and the highest rate of 7.34 mg N g MLSS-1 h-1 in the open reactor with glucose. Enhanced total nitrogen (TN) removal (to 74.6%) by the algal-bacterial consortium was achieved via mixotrophic algal assimilation and bacterial denitrification under oxygen-limited and glucose-sufficient conditions. Nitrogen distribution indicated that ammonia oxidation (∼41.8%) and algal assimilation (∼43.5%) were the main pathways to remove ammonium by the algal-bacterial consortium. TN removal by the algal-bacterial consortium was primarily achieved by algal assimilation (28.1-40.8%), followed by bacterial denitrification (2.9-26.5%). Furthermore, the algal-bacterial consortium contributed to N2O mitigation compared with the activated sludge, reducing N2O production by 35.5-55.0% via autotrophic pathways and by 81.0-93.6% via mixotrophic pathways. Nitrogen assimilation by algae was boosted with the addition of glucose and thus largely restrained N2O production from nitrification and denitrification. The synergism between algae and bacteria was also conducive to an enhanced N2O reduction by denitrification and reduced direct/indirect carbon emissions.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Li, Qi
Xu, Yifeng
Liang, Chuanzhou
Peng, Lai
Zhou, Yan
format Article
author Li, Qi
Xu, Yifeng
Liang, Chuanzhou
Peng, Lai
Zhou, Yan
author_sort Li, Qi
title Nitrogen removal by algal-bacterial consortium during mainstream wastewater treatment: transformation mechanisms and potential N₂O mitigation
title_short Nitrogen removal by algal-bacterial consortium during mainstream wastewater treatment: transformation mechanisms and potential N₂O mitigation
title_full Nitrogen removal by algal-bacterial consortium during mainstream wastewater treatment: transformation mechanisms and potential N₂O mitigation
title_fullStr Nitrogen removal by algal-bacterial consortium during mainstream wastewater treatment: transformation mechanisms and potential N₂O mitigation
title_full_unstemmed Nitrogen removal by algal-bacterial consortium during mainstream wastewater treatment: transformation mechanisms and potential N₂O mitigation
title_sort nitrogen removal by algal-bacterial consortium during mainstream wastewater treatment: transformation mechanisms and potential n₂o mitigation
publishDate 2023
url https://hdl.handle.net/10356/172056
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