Academic Journal
Integration of partial nitrification, endogenous denitrification and anaerobic ammonia oxidation in low dissolved oxygen anaerobic/oxic/anoxic-aerobic granular sludge reactor treating low carbon to nitrogen ratios wastewater.
| Τίτλος: | Integration of partial nitrification, endogenous denitrification and anaerobic ammonia oxidation in low dissolved oxygen anaerobic/oxic/anoxic-aerobic granular sludge reactor treating low carbon to nitrogen ratios wastewater. |
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| Συγγραφείς: | Ma J; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China., Chen L; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China., Ji Y; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China., Sun H; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China., Han Y; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China., Zhu L; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China., Bi P; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China., He Q; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China. Electronic address: qiulaihe@hnu.edu.cn. |
| Πηγή: | Bioresource technology [Bioresour Technol] 2025 Nov; Vol. 435, pp. 132923. Date of Electronic Publication: 2025 Jul 01. |
| Τύπος έκδοσης: | Journal Article |
| Γλώσσα: | English |
| Στοιχεία περιοδικού: | 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- |
| Ιατρικοί όροι (MeSH): | Nitrogen*/metabolism , Bioreactors*/microbiology , Sewage*/microbiology , Carbon*/analysis , Wastewater*/chemistry , Oxygen*/metabolism , Ammonia*/metabolism , Water Purification*/methods , Denitrification* , Nitrification* , Anaerobic Ammonia Oxidation*, Anaerobiosis ; Aerobiosis ; Oxidation-Reduction |
| Περίληψη: | The anaerobic/aerobic/anoxic-aerobic granular sludge (AOA-AGS) process effectively removes nitrogen while tolerating limited oxygen and carbon. However, integrating anaerobic ammonia oxidation (Anammox), which thrives under low organic carbon and oxygen conditions, with AOA-AGS remains challenging. This study investigated nitrogen removal performance and community changes in an AOA-AGS sequencing batch reactor with low carbon to nitrogen ratios (C/N) wastewater and reduced dissolved oxygen (DO) from 5-7 mg/L to 0.5 ± 0.2 mg/L. The total inorganic nitrogen removal rate stabilized at 82 ± 9 % under low DO, driven by partial nitrification and endogenous denitrification through dominant denitrifying glycogen-accumulating organisms (DGAOs), such as Candidatus_Competibacter (43.09 %). Anammox bacteria (mainly Candidatus_Brocadia) were enriched under long solids retention time (128 days) and low DO, synergizing with DGAOs for enhanced nitrogen removal. This study demonstrated that AOA-AGS under low DO enables efficient nitrogen removal through the synergistic endogenous denitrification by DGAOs and Anammox in low C/N wastewater, offering a sustainable strategy. (Copyright © 2025 Elsevier Ltd. 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: Autotrophic nitrogen removal; Carbon–nitrogen metabolic coupling; Granular sludge; Hypoxic wastewater treatment; Microbial community |
| Substance Nomenclature: | N762921K75 (Nitrogen) 0 (Sewage) 7440-44-0 (Carbon) 0 (Wastewater) S88TT14065 (Oxygen) 7664-41-7 (Ammonia) |
| Entry Date(s): | Date Created: 20250703 Date Completed: 20250719 Latest Revision: 20250719 |
| Update Code: | 20260130 |
| DOI: | 10.1016/j.biortech.2025.132923 |
| PMID: | 40609767 |
| Βάση Δεδομένων: | MEDLINE |
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