• Enhancement and mechanism of h...

Treffer: Enhancement and mechanism of heterotrophic ammonia assimilation in saline wastewater treated by intermittent magnetic field.

Title:
Enhancement and mechanism of heterotrophic ammonia assimilation in saline wastewater treated by intermittent magnetic field.
Authors:
Zhang W; School of Civil Engineering, Shandong University, Jinan, Shandong, PR China; Laboratory of Water-Sediment Regulation and Eco-decontamination, Jinan, Shandong, PR China., Zhao C; School of Civil Engineering, Shandong University, Jinan, Shandong, PR China; Laboratory of Water-Sediment Regulation and Eco-decontamination, Jinan, Shandong, PR China., Zhang M; School of Civil Engineering, Shandong University, Jinan, Shandong, PR China; Laboratory of Water-Sediment Regulation and Eco-decontamination, Jinan, Shandong, PR China., Han F; School of Civil Engineering, Shandong University, Jinan, Shandong, PR China; Laboratory of Water-Sediment Regulation and Eco-decontamination, Jinan, Shandong, PR China., Zhou W; School of Civil Engineering, Shandong University, Jinan, Shandong, PR China; Laboratory of Water-Sediment Regulation and Eco-decontamination, Jinan, Shandong, PR China. Electronic address: wzzhou@sdu.edu.cn.
Source:
Bioresource technology [Bioresour Technol] 2026 Jan; Vol. 440, pp. 133447. Date of Electronic Publication: 2025 Oct 06.
Publication Type:
Journal Article
Language:
English
Journal Info:
Publisher: Elsevier Applied Science Country of Publication: England NLM ID: 9889523 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-2976 (Electronic) Linking ISSN: 09608524 NLM ISO Abbreviation: Bioresour Technol Subsets: MEDLINE
Imprint Name(s):
Original Publication: Barking, Essex, England : New York, N.Y. : Elsevier Applied Science ; Elsevier Science Pub. Co., 1991-
MeSH Terms:
Ammonia*/metabolism , Wastewater*/chemistry , Wastewater*/microbiology , Magnetic Fields* , Heterotrophic Processes* , Water Purification*/methods , Salinity*, Bioreactors/microbiology ; Bacteria/metabolism ; Nitrogen/metabolism
Contributed Indexing:
Keywords: Ammonia assimilation; Functional genes; High-salinity wastewater treatment; Magnetic field duty cycle; Microbial community
Substance Nomenclature:
7664-41-7 (Ammonia)
0 (Wastewater)
N762921K75 (Nitrogen)
Entry Date(s):
Date Created: 20251008 Date Completed: 20251113 Latest Revision: 20251115
Update Code:
20251115
DOI:
10.1016/j.biortech.2025.133447
PMID:
41062037
Database:
MEDLINE

Weitere Informationen

Heterotrophic ammonia assimilation (HAA) enhanced by magnetic field (MF) exposure offers a promising strategy for improving the treatment efficiency of high-salinity wastewater. This study investigated the quantitative regulation of MF exposure time, examining how different MF duty cycles impact the performance of HAA bioreactors with the aim of optimising pollutant removal efficiency and reducing processing costs. The results demonstrated that intermittent magnetic field (IMF) exposure maintained consistently high metabolic activity and nitrogen assimilation capacity in HAA bacteria by improving the utilisation efficiency of electron donors and energy. A 3 h-on/9h-off duty cycle (25 %) achieved the optimal balance between positive stimulation and stress mitigation, leading to a 27.6 % improvement in ammonia removal efficiency. IMF exposure not only upregulated key enzymes and functional genes involved in ammonium assimilation but also selectively enriched MF-responsive genera such as Planktosalinus and Marinobacter, thereby enhancing the ecological adaptability and functional resilience of the microbial community. Overall, this study provides valuable insights into the development of energy-efficient and biologically robust saline wastewater treatment systems.
(Copyright © 2025 Elsevier Ltd. All rights reserved.)

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.