Academic Journal
Dissolved oxygen regulation enhances organic micropollutant removal in wastewater treatment bioreactors.
| Τίτλος: | Dissolved oxygen regulation enhances organic micropollutant removal in wastewater treatment bioreactors. |
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| Συγγραφείς: | Zhang K; State Key Laboratory of Water Pollution Control and Green Resource Recycling, School of Environment, Nanjing University, Nanjing 210023, China., Fang Y; State Key Laboratory of Water Pollution Control and Green Resource Recycling, School of Environment, Nanjing University, Nanjing 210023, China., Zhang L; MCC Eco-Environmental Protection Group (Chuzhou) Research Institute Co., Ltd., Chuzhou 239064, China., Zhao W; State Key Laboratory of Water Pollution Control and Green Resource Recycling, School of Environment, Nanjing University, Nanjing 210023, China., Zhang X; State Key Laboratory of Water Pollution Control and Green Resource Recycling, School of Environment, Nanjing University, Nanjing 210023, China., Ye L; State Key Laboratory of Water Pollution Control and Green Resource Recycling, School of Environment, Nanjing University, Nanjing 210023, China. Electronic address: linye@nju.edu.cn. |
| Πηγή: | Journal of hazardous materials [J Hazard Mater] 2026 Aug 01; Vol. 514, pp. 142887. Date of Electronic Publication: 2026 Jul 06. |
| Τύπος έκδοσης: | Journal Article |
| Γλώσσα: | English |
| Στοιχεία περιοδικού: | Publisher: Elsevier Country of Publication: Netherlands NLM ID: 9422688 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-3336 (Electronic) Linking ISSN: 03043894 NLM ISO Abbreviation: J Hazard Mater Subsets: MEDLINE |
| Imprint Name(s): | Original Publication: Amsterdam : Elsevier |
| Ιατρικοί όροι (MeSH): | Bioreactors*/microbiology , Oxygen*/chemistry , Water Pollutants, Chemical*/metabolism , Waste Disposal, Fluid*/methods , Wastewater*, Bacteria/metabolism ; Bacteria/genetics ; Biodegradation, Environmental |
| Περίληψη: | Organic micropollutants (OMPs) are ubiquitously detected in wastewater and pose potential risks to aquatic ecosystems and human health, making their effective removal a critical objective of wastewater treatment processes. Dissolved oxygen (DO) is a central operational parameter that governs microbial metabolism in biological wastewater treatment processes; however, its long-term role in controlling OMP removal remains insufficiently understood. Here, three bioreactors were operated for 166 days under staged DO conditions ranging from 0.8 to 4.5 mg/L to systematically evaluate the effects of DO on the removal of eight representative OMPs and associated microbial responses. Operating at a low DO level maintained stable removal of conventional pollutants while significantly enhancing the biodegradation of several OMPs, including dimetridazole, ofloxacin, trimethoprim, and sulfamethazine. Despite only minor changes in overall community composition, intermediate and rare taxa exhibited pronounced sensitivity to DO variation, suggesting their potential involvement in OMP biodegradation under low-oxygen conditions. Enzyme activity measurements combined with metagenomic and transcriptomic analyses further revealed that low DO promoted higher activity, abundance, and expression of redox-related co-metabolic enzymes, particularly peroxidases and cytochrome P450 enzymes. These results demonstrate that DO regulates OMP removal primarily by reshaping microbial functional potential and redox metabolism. Overall, this study provides both mechanistic understanding and practical guidance for applying DO regulation to achieve enhanced micropollutant removal in wastewater treatment systems. (Copyright © 2026 Elsevier B.V. All rights reserved.) |
| 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. |
| Contributed Indexing: | Keywords: Co-metabolic degradation; Dissolved oxygen; Microbial community; Micropollutant biodegradation; Wastewater treatment |
| Substance Nomenclature: | S88TT14065 (Oxygen) 0 (Water Pollutants, Chemical) 0 (Wastewater) |
| Entry Date(s): | Date Created: 20260707 Date Completed: 20260725 Latest Revision: 20260725 |
| Update Code: | 20260725 |
| DOI: | 10.1016/j.jhazmat.2026.142887 |
| PMID: | 42413405 |
| Βάση Δεδομένων: | MEDLINE |
| ISSN: | 1873-3336 |
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| DOI: | 10.1016/j.jhazmat.2026.142887 |