Effects of different aeration strategies and ammonia-nitrogen loads on nitrification performance and microbial community succession of mangrove constructed wetlands for saline wastewater treatment

In highly salinized environments, nitrification is the process that limits the rate of nitrogen transformation and removal. Therefore, this study concentrated on the impacts of different aeration strategies and NH4+–N loads on the nitrification performance of mangrove constructed wetlands (CWs), as...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2023-10, Vol.339, p.139685-139685, Article 139685
Main Authors: Zhao, Lin, Fu, Guiping, Zeng, Anzu, Cheng, Bingzhen, Song, Zihao, Hu, Zhangli
Format: Article
Language:English
Subjects:
Continuous aeration
Functional gene
Intermittent aeration
Microbial mechanism
Pollution load
Rhizosphere effect
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Summary:In highly salinized environments, nitrification is the process that limits the rate of nitrogen transformation and removal. Therefore, this study concentrated on the impacts of different aeration strategies and NH4+–N loads on the nitrification performance of mangrove constructed wetlands (CWs), as well as investigating the succession mechanism of ammonia-oxidizing microorganisms (AOMs). The results showed that both the CW with continuous aeration (CA-CW) and intermittent aeration (IA-CW) achieved a nitrification efficiency of more than 98% under an NH4+–N loading of 1.25–4.7 g/(m2·d). However, the total nitrogen removal rates of IA-CW under low and high ammonia-nitrogen loads (LAL, 20.09 ± 4.4% and HAL, 8.77 ± 1.35%, respectively) were higher than those of CA-CW (16.11 ± 4.7% and 3.32 ± 2.3%, respectively), especially under HAL (p 
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2023.139685