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Synergistic mechanisms of denitrification in FeS 2 -based constructed wetlands: Effects of organic carbon availability under day-night alterations.

Authors :
Hao Q
Lyu X
Qin D
Du N
Wu S
Bai S
Chen Z
Wang P
Zhao X
Source :
Bioresource technology [Bioresour Technol] 2024 Aug; Vol. 406, pp. 131066. Date of Electronic Publication: 2024 Jul 03.
Publication Year :
2024

Abstract

In constructed wetlands (CWs), carbon source availability profoundly affected microbial metabolic activities engaged in both iron cycle and nitrogen metabolism. However, research gaps existed in understanding the biotransformation of nitrogen and iron in response to fluctuations in organic carbon content under day-night alterations. Results demonstrated increased removal efficiency of NO <subscript>3</subscript> <superscript>-</superscript> -N (95.7 %) and NH <subscript>4</subscript> <superscript>+</superscript> -N (75.70 %) under light conditions, attributed to increased total organic carbon (TOC). This enhancement promoted the relative abundance of bacteria involved in nitrogen and iron processes, establishing a more stable microbial network. Elevated TOC content also upregulated genes for iron metabolism and glycolysis, facilitating denitrification. Spearman correlation analysis supported the synergistic mechanisms between FeS <subscript>2</subscript> -based autotrophic denitrification and TOC-mediated heterotrophic denitrification under light conditions. The significant impact of carbon sources on microbial activities underscores the critical role of organic carbon availability in enhancing nitrogen removal efficiency, providing valuable insights for optimizing FeS <subscript>2</subscript> -based CWs design and operation strategies.<br />Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2024 Elsevier Ltd. All rights reserved.)

Details

Language :
English
ISSN :
1873-2976
Volume :
406
Database :
MEDLINE
Journal :
Bioresource technology
Publication Type :
Academic Journal
Accession number :
38969240
Full Text :
https://doi.org/10.1016/j.biortech.2024.131066