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Biogas-driven sidestream nitrogen removal: A perspective on replacing partial nitritation with aerobic methane oxidation-denitrification toward carbon-neutral wastewater treatment.

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Τίτλος: Biogas-driven sidestream nitrogen removal: A perspective on replacing partial nitritation with aerobic methane oxidation-denitrification toward carbon-neutral wastewater treatment.
Συγγραφείς: Kim IT; Department of Environment Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do, 10223, South Korea. Electronic address: itkim@kict.re.kr., Jeong Y; Department of Environment Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do, 10223, South Korea., Lee YE; Department of Environment Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do, 10223, South Korea., Ahn KH; Department of Environment Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do, 10223, South Korea., Jung JH; Department of Environment Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do, 10223, South Korea.
Πηγή: Water research [Water Res] 2026 Oct 15; Vol. 305, pp. 126456. Date of Electronic Publication: 2026 Jul 08.
Τύπος έκδοσης: Journal Article; Review
Γλώσσα: English
Στοιχεία περιοδικού: Publisher: Pergamon Press Country of Publication: England NLM ID: 0105072 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-2448 (Electronic) Linking ISSN: 00431354 NLM ISO Abbreviation: Water Res Subsets: MEDLINE
Imprint Name(s): Original Publication: Oxford, Pergamon Press.
Ιατρικοί όροι (MeSH): Methane*/metabolism , Nitrogen*/isolation & purification , Nitrogen*/metabolism , Waste Disposal, Fluid*/methods , Wastewater*/chemistry , Biofuels*, Oxidation-Reduction ; Denitrification ; Carbon ; Aerobiosis
Περίληψη: Sidestream reject water from anaerobic digesters imposes a disproportionately high nitrogen load (typically ∼15-25% of the total plant nitrogen load despite comprising <5% of total influent volume) on wastewater treatment plants. However, existing biological removal technologies, including partial nitritation/anammox and anaerobic methane oxidation-based processes, are structurally disconnected from onsite biogas valorization. In this review, we evaluated the feasibility of replacing the conventional partial nitritation stage with aerobic methane oxidation coupled with denitrification (AME-D) in an integrated two-stage system toward carbon-neutral sidestream nitrogen removal. We synthesized the current knowledge on methane-oxidizing microbial ecology, interguild carbon transfer networks, and the enabling roles of reject water composition and biogas-derived CO₂ in sustaining integrated process performance. The key findings indicate that AME-D can serve as a multifunctional upstream stage, concurrently supplying nitrite, reducing ammonium load, and providing carbon intermediates to the downstream nitrate/nitrite-dependent anaerobic methane oxidation (n-DAMO) consortium. This enables biogas-driven complete nitrogen removal without external carbon input. The principal challenges involved in this process include greenhouse gas emission management, membrane fouling under high-strength sidestream conditions, and constraints on micronutrient bioavailability, which may compromise long-term microbial stability. This review proposes an integrated conceptual framework for AME-D/n-DAMO process design, identifies research priorities in pilot-scale validation and multi-guild community engineering, and articulates a pathway toward circular bioeconomy implementation in urban water resource recovery.
(Copyright © 2026 The Author(s). Published by Elsevier Ltd.. All rights reserved.)
Competing Interests: Declaration of competing interest The authors declare that they have no competing financial interests or personal relationships that could influence the work reported in this study.
Contributed Indexing: Keywords: Biogas; Circular bioeconomy; Methane oxidation; Methanol cross-feeding; Reject water; Sidestream nitrogen removal
Substance Nomenclature: OP0UW79H66 (Methane)
N762921K75 (Nitrogen)
0 (Biofuels)
0 (Wastewater)
7440-44-0 (Carbon)
Entry Date(s): Date Created: 20260714 Date Completed: 20260909 Latest Revision: 20260909
Update Code: 20260909
DOI: 10.1016/j.watres.2026.126456
PMID: 42447669
Βάση Δεδομένων: MEDLINE
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  Data: Biogas-driven sidestream nitrogen removal: A perspective on replacing partial nitritation with aerobic methane oxidation-denitrification toward carbon-neutral wastewater treatment.
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  Data: Sidestream reject water from anaerobic digesters imposes a disproportionately high nitrogen load (typically ∼15-25% of the total plant nitrogen load despite comprising &amp;lt;5% of total influent volume) on wastewater treatment plants. However, existing biological removal technologies, including partial nitritation/anammox and anaerobic methane oxidation-based processes, are structurally disconnected from onsite biogas valorization. In this review, we evaluated the feasibility of replacing the conventional partial nitritation stage with aerobic methane oxidation coupled with denitrification (AME-D) in an integrated two-stage system toward carbon-neutral sidestream nitrogen removal. We synthesized the current knowledge on methane-oxidizing microbial ecology, interguild carbon transfer networks, and the enabling roles of reject water composition and biogas-derived CO₂ in sustaining integrated process performance. The key findings indicate that AME-D can serve as a multifunctional upstream stage, concurrently supplying nitrite, reducing ammonium load, and providing carbon intermediates to the downstream nitrate/nitrite-dependent anaerobic methane oxidation (n-DAMO) consortium. This enables biogas-driven complete nitrogen removal without external carbon input. The principal challenges involved in this process include greenhouse gas emission management, membrane fouling under high-strength sidestream conditions, and constraints on micronutrient bioavailability, which may compromise long-term microbial stability. This review proposes an integrated conceptual framework for AME-D/n-DAMO process design, identifies research priorities in pilot-scale validation and multi-guild community engineering, and articulates a pathway toward circular bioeconomy implementation in urban water resource recovery.&lt;br /&gt; (Copyright &#169; 2026 The Author(s). Published by Elsevier Ltd.. All rights reserved.)
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