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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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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.
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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  – Url: https://www.doi.org/10.1016/j.biortech.2025.132923?
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  Data: 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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  Data: <searchLink fieldCode="AU" term="%22Ma+J%22">Ma J</searchLink>; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China.<br /><searchLink fieldCode="AU" term="%22Chen+L%22">Chen L</searchLink>; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China.<br /><searchLink fieldCode="AU" term="%22Ji+Y%22">Ji Y</searchLink>; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China.<br /><searchLink fieldCode="AU" term="%22Sun+H%22">Sun H</searchLink>; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China.<br /><searchLink fieldCode="AU" term="%22Han+Y%22">Han Y</searchLink>; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China.<br /><searchLink fieldCode="AU" term="%22Zhu+L%22">Zhu L</searchLink>; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China.<br /><searchLink fieldCode="AU" term="%22Bi+P%22">Bi P</searchLink>; Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha 410082, PR China.<br /><searchLink fieldCode="AU" term="%22He+Q%22">He Q</searchLink>; 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.
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  Data: <searchLink fieldCode="JN" term="%229889523%22">Bioresource technology</searchLink> [Bioresour Technol] 2025 Nov; Vol. 435, pp. 132923. <i>Date of Electronic Publication: </i>2025 Jul 01.
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  Data: <i>Publisher: </i><searchLink fieldCode="PB" term="%22Elsevier+Applied+Science%22">Elsevier Applied Science </searchLink><i>Country of Publication: </i>England <i>NLM ID: </i>9889523 <i>Publication Model: </i>Print-Electronic <i>Cited Medium: </i>Internet <i>ISSN: </i>1873-2976 (Electronic) <i>Linking ISSN: </i><searchLink fieldCode="IS" term="%2209608524%22">09608524 </searchLink><i>NLM ISO Abbreviation: </i>Bioresour Technol <i>Subsets: </i>MEDLINE
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  Data: <i>Original Publication</i>: Barking, Essex, England : New York, N.Y. : Elsevier Applied Science ; Elsevier Science Pub. Co., 1991-
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  Data: <searchLink fieldCode="MM" term="%22Nitrogen%22">Nitrogen*</searchLink>/<searchLink fieldCode="MM" term="%22Nitrogen+metabolism%22">metabolism</searchLink> <br /><searchLink fieldCode="MM" term="%22Bioreactors%22">Bioreactors*</searchLink>/<searchLink fieldCode="MM" term="%22Bioreactors+microbiology%22">microbiology</searchLink> <br /><searchLink fieldCode="MM" term="%22Sewage%22">Sewage*</searchLink>/<searchLink fieldCode="MM" term="%22Sewage+microbiology%22">microbiology</searchLink> <br /><searchLink fieldCode="MM" term="%22Carbon%22">Carbon*</searchLink>/<searchLink fieldCode="MM" term="%22Carbon+analysis%22">analysis</searchLink> <br /><searchLink fieldCode="MM" term="%22Wastewater%22">Wastewater*</searchLink>/<searchLink fieldCode="MM" term="%22Wastewater+chemistry%22">chemistry</searchLink> <br /><searchLink fieldCode="MM" term="%22Oxygen%22">Oxygen*</searchLink>/<searchLink fieldCode="MM" term="%22Oxygen+metabolism%22">metabolism</searchLink> <br /><searchLink fieldCode="MM" term="%22Ammonia%22">Ammonia*</searchLink>/<searchLink fieldCode="MM" term="%22Ammonia+metabolism%22">metabolism</searchLink> <br /><searchLink fieldCode="MM" term="%22Water+Purification%22">Water Purification*</searchLink>/<searchLink fieldCode="MM" term="%22Water+Purification+methods%22">methods</searchLink> <br /><searchLink fieldCode="MM" term="%22Denitrification%22">Denitrification*</searchLink> <br /><searchLink fieldCode="MM" term="%22Nitrification%22">Nitrification*</searchLink> <br /><searchLink fieldCode="MM" term="%22Anaerobic+Ammonia+Oxidation%22">Anaerobic Ammonia Oxidation*</searchLink><br /><searchLink fieldCode="MH" term="%22Anaerobiosis%22">Anaerobiosis</searchLink> ; <searchLink fieldCode="MH" term="%22Aerobiosis%22">Aerobiosis</searchLink> ; <searchLink fieldCode="MH" term="%22Oxidation-Reduction%22">Oxidation-Reduction</searchLink>
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  Data: 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.<br /> (Copyright © 2025 Elsevier Ltd. All rights reserved.)
– Name: Abstract
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  Data: 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.
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  Data: <i>Keywords: </i>Autotrophic nitrogen removal; Carbon–nitrogen metabolic coupling; Granular sludge; Hypoxic wastewater treatment; Microbial community
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  Data: N762921K75 (Nitrogen)<br />0 (Sewage)<br />7440-44-0 (Carbon)<br />0 (Wastewater)<br />S88TT14065 (Oxygen)<br />7664-41-7 (Ammonia)
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        StartPage: 132923
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      – SubjectFull: Anaerobiosis
        Type: general
      – SubjectFull: Aerobiosis
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      – SubjectFull: Oxidation-Reduction
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      – SubjectFull: Anaerobic Ammonia Oxidation
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