DOI: 10.1016/j.watres.2018.06.025
Scopus记录号: 2-s2.0-85049320965
论文题名: Nitrite accumulation inside sludge flocs significantly influencing nitrous oxide production by ammonium-oxidizing bacteria
作者: Chen X. ; Yuan Z. ; Ni B.-J.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 143 起始页码: 99
结束页码: 108
语种: 英语
英文关键词: Dissolved oxygen
; Mathematical modelling
; Nitrite accumulation
; Nitrous oxide (N2O)
; Production pathway
Scopus关键词: Amines
; Bacteria
; Denitrification
; Mathematical models
; Nitration
; Nitrogen oxides
; Ammonium concentrations
; Ammonium oxidizing bacteria
; Nitrite accumulation
; Nitrite-oxidizing bacteria
; Nitrous oxide
; Nitrous oxide production
; Positive impacts
; Production pathways
; Dissolved oxygen
; ammonia
; dissolved oxygen
; hydroxylamine
; nitrite
; nitrogen
; nitrous oxide
; bacterium
; biomass
; denitrification
; dissolved oxygen
; experimental study
; flocculation
; microbial activity
; modeling
; nitrate
; nitrous oxide
; activated sludge
; anammox bacterium
; Article
; biomass
; denitrification
; nitrification
; nonhuman
; priority journal
英文摘要: This work aims to clarify the role of potential nitrite (NO2 −) accumulation inside sludge flocs in N2O production by ammonium-oxidizing bacteria (AOB) at different dissolved oxygen (DO) levels with focus on the conditions of no significant bulk NO2 − accumulation (<0.2 mg N/L). To this end, an augmented nitrifying sludge with much higher abundance of nitrite-oxidizing bacteria (NOB) than AOB was enriched and then used for systematically designed batch tests, which targeted a range of DO levels from 0 to 3.0 mg O2/L at a fixed ammonium concentration of 10 mg N/L. A two-pathway N2O model was applied to facilitate the interpretation of batch experimental data, thus shedding light on the relationships between N2O production pathways and key process parameters (i.e., DO and NO2 − accumulation inside sludge flocs). The results demonstrated (i) the biomass specific N2O production rate firstly increased and then decreased with DO, with the maximum value of 3.03 ± 0.05 mg N/h/g VSS obtained at DO level of 0.75 mg O2/L, (ii) the AOB denitrification pathway for N2O production was dominant (98.0%) at all DO levels tested even without significant bulk NO2 − accumulation (<0.2 mg N/L) observed in the system, but its contribution decreased with DO, (iii) DO had a positive impact on the hydroxylamine pathway for N2O production which therefore increased with DO, and (iv) the nitrite accumulation existed inside the sludge flocs and induced significant N2O production from the AOB denitrification pathway. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112542
Appears in Collections: 气候减缓与适应
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作者单位: Advanced Water Management Centre, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia; Process and Systems Engineering Center (PROSYS), Department of Chemical and Biochemical Engineering, Technical University of Denmark, Kgs. Lyngby, 2800, Denmark
Recommended Citation:
Chen X.,Yuan Z.,Ni B.-J.. Nitrite accumulation inside sludge flocs significantly influencing nitrous oxide production by ammonium-oxidizing bacteria[J]. Water Research,2018-01-01,143