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Enhanced oxygen transfer, stable nitrifying biofilm, and low N2O emissions in a pilot-scale hybrid MABR incorporating gear-structured gas-permeable membranes.

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Τίτλος: Enhanced oxygen transfer, stable nitrifying biofilm, and low N2O emissions in a pilot-scale hybrid MABR incorporating gear-structured gas-permeable membranes.
Συγγραφείς: Kigo Y; Department of Applied Physics and Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan; Aqua Solutions Group, Mitsubishi Chemical Corporation, 4-1-2 Ushikawa-dori, Toyohashi, Aichi 440-8601, Japan., Furuno S; Aqua Solutions Group, Mitsubishi Chemical Corporation, 4-1-2 Ushikawa-dori, Toyohashi, Aichi 440-8601, Japan., Miura H; Department of Applied Physics and Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan., Kobayashi M; Aqua Solutions Group, Mitsubishi Chemical Corporation, 4-1-2 Ushikawa-dori, Toyohashi, Aichi 440-8601, Japan., Takahashi S; Water and Environment R&D Dep. II, Kubota Corporation, 1-1-1 Hama, Amagasaki, Hyogo, 661-8567, Japan., Terada A; Department of Applied Physics and Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan. Electronic address: akte@cc.tuat.ac.jp.
Πηγή: Water research [Water Res] 2026 Oct 01; Vol. 304, pp. 126260. Date of Electronic Publication: 2026 Jun 06.
Τύπος έκδοσης: Journal Article
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): Oxygen*/metabolism , Bioreactors*/microbiology , Nitrous Oxide*/analysis , Waste Disposal, Fluid*/methods , Waste Disposal, Fluid*/instrumentation , Biofilms* , Membranes, Artificial* , Nitrification*, Sewage/microbiology ; Ammonia/metabolism ; Pilot Projects
Περίληψη: This study demonstrates the feasibility and performance of a pilot-scale hybrid membrane-aerated biofilm reactor (MABR) equipped with an innovative gear-structured polyethylene membrane. Over 210 days of continuous operation, the integrated system-comprising an anaerobic tank, a hybrid MABR tank, containing 2-16 cassettes within a membrane module, and an aerobic tank-achieved removal efficiencies of 88 ± 12% for BOD, 40 ± 14% for total nitrogen, and 90 ± 14% for ammonia. The total sludge yield was 0.20 kg-TSS/kg-CODMn, significantly lower than that of conventional activated sludge systems. Spatial and temporal variations in oxygen transfer rate (OTR) and efficiency (OTE) were observed across membrane cassettes. The average OTR ranged from 3.51 to 9.63 g-O₂/(m²·day) and was influenced by operating time and membrane surface area, with lower surface areas enhancing OTR. These results highlight the importance of hydrodynamics and cassette configuration in optimizing oxygen supply. Campaign-based assessments revealed low N₂O emission factors of 0.058% on day 100 (29.2 °C) and 0.074% on day 190 (18.5 °C). At 18.5 °C, N₂O emissions were primarily attributed to the aerobic tank, while contributions from the MABR tank decreased over time, likely due to biofilm maturation. Combined microbial analyses revealed dense populations of ammonia-oxidizing bacteria within the membrane biofilm, dominated by comammox Nitrospira, which likely contributed to the observed low N₂O emissions. Overall, gear-structured membranes promoted resilient biofilm formation, reduced sludge production, and minimized N₂O emissions. These findings provide important insights into the design and operation of sustainable and energy-efficient MABR systems for wastewater treatment.
(Copyright © 2026 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: Ammonia-oxidizing bacteria; Gas-permeable membrane; Membrane-aerated biofilm reactor (MABR); Nitrogen removal; Nitrous oxide (N(2)O); Oxygen transfer rate
Substance Nomenclature: S88TT14065 (Oxygen)
0 (Membranes, Artificial)
K50XQU1029 (Nitrous Oxide)
0 (Sewage)
7664-41-7 (Ammonia)
Entry Date(s): Date Created: 20260619 Date Completed: 20260815 Latest Revision: 20260815
Update Code: 20260815
DOI: 10.1016/j.watres.2026.126260
PMID: 42320403
Βάση Δεδομένων: MEDLINE
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  Data: Enhanced oxygen transfer, stable nitrifying biofilm, and low N<subscript>2</subscript>O emissions in a pilot-scale hybrid MABR incorporating gear-structured gas-permeable membranes.
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  Data: <searchLink fieldCode="AU" term="%22Kigo+Y%22">Kigo Y</searchLink>; Department of Applied Physics and Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan; Aqua Solutions Group, Mitsubishi Chemical Corporation, 4-1-2 Ushikawa-dori, Toyohashi, Aichi 440-8601, Japan.<br /><searchLink fieldCode="AU" term="%22Furuno+S%22">Furuno S</searchLink>; Aqua Solutions Group, Mitsubishi Chemical Corporation, 4-1-2 Ushikawa-dori, Toyohashi, Aichi 440-8601, Japan.<br /><searchLink fieldCode="AU" term="%22Miura+H%22">Miura H</searchLink>; Department of Applied Physics and Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.<br /><searchLink fieldCode="AU" term="%22Kobayashi+M%22">Kobayashi M</searchLink>; Aqua Solutions Group, Mitsubishi Chemical Corporation, 4-1-2 Ushikawa-dori, Toyohashi, Aichi 440-8601, Japan.<br /><searchLink fieldCode="AU" term="%22Takahashi+S%22">Takahashi S</searchLink>; Water and Environment R&D Dep. II, Kubota Corporation, 1-1-1 Hama, Amagasaki, Hyogo, 661-8567, Japan.<br /><searchLink fieldCode="AU" term="%22Terada+A%22">Terada A</searchLink>; Department of Applied Physics and Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan. Electronic address: akte@cc.tuat.ac.jp.
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  Data: This study demonstrates the feasibility and performance of a pilot-scale hybrid membrane-aerated biofilm reactor (MABR) equipped with an innovative gear-structured polyethylene membrane. Over 210 days of continuous operation, the integrated system-comprising an anaerobic tank, a hybrid MABR tank, containing 2-16 cassettes within a membrane module, and an aerobic tank-achieved removal efficiencies of 88 ± 12% for BOD, 40 ± 14% for total nitrogen, and 90 ± 14% for ammonia. The total sludge yield was 0.20 kg-TSS/kg-COD<subscript>Mn</subscript>, significantly lower than that of conventional activated sludge systems. Spatial and temporal variations in oxygen transfer rate (OTR) and efficiency (OTE) were observed across membrane cassettes. The average OTR ranged from 3.51 to 9.63 g-O₂/(m²·day) and was influenced by operating time and membrane surface area, with lower surface areas enhancing OTR. These results highlight the importance of hydrodynamics and cassette configuration in optimizing oxygen supply. Campaign-based assessments revealed low N₂O emission factors of 0.058% on day 100 (29.2 °C) and 0.074% on day 190 (18.5 °C). At 18.5 °C, N₂O emissions were primarily attributed to the aerobic tank, while contributions from the MABR tank decreased over time, likely due to biofilm maturation. Combined microbial analyses revealed dense populations of ammonia-oxidizing bacteria within the membrane biofilm, dominated by comammox Nitrospira, which likely contributed to the observed low N₂O emissions. Overall, gear-structured membranes promoted resilient biofilm formation, reduced sludge production, and minimized N₂O emissions. These findings provide important insights into the design and operation of sustainable and energy-efficient MABR systems for wastewater treatment.<br /> (Copyright © 2026 Elsevier Ltd. All rights reserved.)
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