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Effect of excess and restricted inorganic carbon on biokinetics, nitrous oxide emissions, and microbial community in a full-nitrification bioreactor.

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Τίτλος: Effect of excess and restricted inorganic carbon on biokinetics, nitrous oxide emissions, and microbial community in a full-nitrification bioreactor.
Συγγραφείς: Heo S; Department of Civil and Environmental Engineering, Hanyang University, Seongdong-gu, Seoul, 04763, Republic of Korea; Developing a Team Response Using Digital Construction to Mitigate Disasters Related to Climate Change (BK21 FOUR), Hanyang University, Seongdong-gu, Seoul, 04763, Republic of Korea., Jeon JH; School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Buk-gu, Gwangju, 500-712, Republic of Korea., Lee S; Department of Civil and Environmental Engineering, Hanyang University, Seongdong-gu, Seoul, 04763, Republic of Korea., Park H; Department of Civil and Environmental Engineering, Hanyang University, Seongdong-gu, Seoul, 04763, Republic of Korea; Developing a Team Response Using Digital Construction to Mitigate Disasters Related to Climate Change (BK21 FOUR), Hanyang University, Seongdong-gu, Seoul, 04763, Republic of Korea., Wang M; College of Earth and Mineral Sciences, Pennsylvania State University, University Park, PA, 16802, United States., Lee JH; Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea., Kim YM; Department of Civil and Environmental Engineering, Hanyang University, Seongdong-gu, Seoul, 04763, Republic of Korea; Developing a Team Response Using Digital Construction to Mitigate Disasters Related to Climate Change (BK21 FOUR), Hanyang University, Seongdong-gu, Seoul, 04763, Republic of Korea. Electronic address: youngmo@hanyang.ac.kr.
Πηγή: Environmental research [Environ Res] 2026 Aug 15; Vol. 303 (Pt 1), pp. 124726. Date of Electronic Publication: 2026 May 15.
Τύπος έκδοσης: Journal Article
Γλώσσα: English
Στοιχεία περιοδικού: Publisher: Elsevier Country of Publication: Netherlands NLM ID: 0147621 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1096-0953 (Electronic) Linking ISSN: 00139351 NLM ISO Abbreviation: Environ Res Subsets: MEDLINE
Imprint Name(s): Publication: <2000- > : Amsterdam : Elsevier
Original Publication: New York, Academic Press.
Ιατρικοί όροι (MeSH): Bioreactors*/microbiology , Nitrous Oxide*/metabolism , Nitrous Oxide*/analysis , Carbon*/metabolism , Nitrification*, Bacteria/metabolism ; Nitrites/metabolism ; Ammonia/metabolism
Περίληψη: Inorganic carbon (IC) availability was evaluated as a driver of the nitrification process, biokinetics of nitrifying bacteria, nitrous oxide formation, and community structure in a continuous full-nitrification reactor operated under IC sufficiency, limitation, and recovery. Reactor behavior was tracked using dissolved IC and nitrogen profiles (NH4+, NO2-, NO3-), short-term respirometric specific oxygen uptake rates for ammonia oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB), on-line N2O monitoring, and 16 S rRNA gene sequencing. IC limitation consistently suppressed AOB respiration and apparent growth capacity, increased effective substrate requirements, and led to NO2- increase together with a decline in biomass. After IC was restored, AOB activity recovered faster than NOB activity, causing nitrite accumulation and the highest N2O emissions. Peak effluent NO2- reached 12.7 mg N/L and gas-phase N2O concentration peaked at about 18 ppmv. The biomass-specific N2O production rate increased by more than an order of magnitude compared to the IC-sufficient baseline. Multivariate and correlational analyses indicated that effluent nitrite and biomass state, rather than absolute IC alone, were the dominant proximate predictors of emission variability. Community composition shifted coherently - a decrease in Nitrosomonas during limitation and rebounding during recovery, a modest increase of Nitrobacter, and transient enrichment of heterotrophs consistent with endogenous carbon cycling under stress conditions. Maintaining adequate IC supply, avoiding abrupt IC changes, and monitoring NO2- and oxygen uptake metrics are suggested as practical methods to sustain complete nitrification while minimizing N2O emission.
(Copyright © 2026 Elsevier Inc. 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; Inorganic carbon limitation; Nitrite oxidizing bacteria; Nitrous oxide emissions; Specific oxygen uptake rate
Substance Nomenclature: K50XQU1029 (Nitrous Oxide)
7440-44-0 (Carbon)
0 (Nitrites)
7664-41-7 (Ammonia)
Entry Date(s): Date Created: 20260516 Date Completed: 20260610 Latest Revision: 20260610
Update Code: 20260611
DOI: 10.1016/j.envres.2026.124726
PMID: 42142565
Βάση Δεδομένων: MEDLINE
Περιγραφή
ISSN:1096-0953
DOI:10.1016/j.envres.2026.124726