The combined effect of dissolved oxygen and nitrite on N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge
Both nitrite [Formula: see text] and dissolved oxygen (DO) play important roles in nitrous oxide (N2O) production by ammonia oxidizing bacteria (AOB). However, few studies focused on the combined effect of them on N2O production by AOB as well as the corresponding mechanisms. In this study, N2O prod...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Peng, Lai [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015 |
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| Rechteinformationen: |
Nutzungsrecht: Copyright © 2015 Elsevier Ltd. All rights reserved. |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Water research - Amsterdam [u.a.] : Elsevier, Pergamon, 1967, 73(2015), Seite 29-36 |
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| Übergeordnetes Werk: |
volume:73 ; year:2015 ; pages:29-36 |
| Links: |
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| DOI / URN: |
10.1016/j.watres.2015.01.021 |
|---|
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| 245 | 1 | 4 | |a The combined effect of dissolved oxygen and nitrite on N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge |
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| 520 | |a Both nitrite [Formula: see text] and dissolved oxygen (DO) play important roles in nitrous oxide (N2O) production by ammonia oxidizing bacteria (AOB). However, few studies focused on the combined effect of them on N2O production by AOB as well as the corresponding mechanisms. In this study, N2O production by an enriched nitrifying sludge, consisting of both AOB and nitrite-oxidizing bacteria (NOB), was investigated under various [Formula: see text] and DO concentrations. At each investigated DO level, both the biomass specific N2O production rate and the N2O emission factor (the ratio between N2O nitrogen emitted and the ammonium nitrogen converted) increased as [Formula: see text] concentration increased from 3 mg N/L to 50 mg N/L. However, at each investigated [Formula: see text] level, the maximum biomass specific N2O production rate occurred at DO of 0.85 mg O2/L, while the N2O emission factor decreased as DO increased from 0.35 to 3.5 mg O2/L. The analysis of the process data using a mathematical N2O model incorporating both the AOB denitrification and hydroxylamine (NH2OH) oxidation pathways indicated that the contribution of AOB denitrification pathway increased as [Formula: see text] concentration increased, but decreased as DO concentration increased, accompanied by a corresponding change in the contribution of NH2OH oxidation pathway to N2O production. The AOB denitrification pathway was predominant in most cases, with the NH2OH oxidation pathway making a comparable contribution only at high DO level (e.g. 3.5 mg O2/L). | ||
| 540 | |a Nutzungsrecht: Copyright © 2015 Elsevier Ltd. All rights reserved. | ||
| 650 | 4 | |a Nitrous Oxide - metabolism | |
| 650 | 4 | |a Bacteria - metabolism | |
| 650 | 4 | |a Nitrites - metabolism | |
| 650 | 4 | |a Bioreactors - microbiology | |
| 650 | 4 | |a Sewage - microbiology | |
| 650 | 4 | |a Ammonia - metabolism | |
| 650 | 4 | |a Oxygen - metabolism | |
| 700 | 1 | |a Ni, Bing-Jie |4 oth | |
| 700 | 1 | |a Ye, Liu |4 oth | |
| 700 | 1 | |a Yuan, Zhiguo |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |t Water research |d Amsterdam [u.a.] : Elsevier, Pergamon, 1967 |g 73(2015), Seite 29-36 |w (DE-627)129471860 |w (DE-600)202613-2 |w (DE-576)014841630 |x 0043-1354 |7 nnns |
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| 856 | 4 | 1 | |u http://dx.doi.org/10.1016/j.watres.2015.01.021 |3 Volltext |
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10.1016/j.watres.2015.01.021 doi PQ20160617 (DE-627)OLC1963551141 (DE-599)GBVOLC1963551141 (PRQ)c1574-e4d8c0bc47f1a75806b613d1edd5a8d4ef902984ee4a1c5a785fe2e20b3470470 (KEY)0018203620150000073000000029combinedeffectofdissolvedoxygenandnitriteonn2oprod DE-627 ger DE-627 rakwb eng 550 DNB Peng, Lai verfasserin aut The combined effect of dissolved oxygen and nitrite on N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Both nitrite [Formula: see text] and dissolved oxygen (DO) play important roles in nitrous oxide (N2O) production by ammonia oxidizing bacteria (AOB). However, few studies focused on the combined effect of them on N2O production by AOB as well as the corresponding mechanisms. In this study, N2O production by an enriched nitrifying sludge, consisting of both AOB and nitrite-oxidizing bacteria (NOB), was investigated under various [Formula: see text] and DO concentrations. At each investigated DO level, both the biomass specific N2O production rate and the N2O emission factor (the ratio between N2O nitrogen emitted and the ammonium nitrogen converted) increased as [Formula: see text] concentration increased from 3 mg N/L to 50 mg N/L. However, at each investigated [Formula: see text] level, the maximum biomass specific N2O production rate occurred at DO of 0.85 mg O2/L, while the N2O emission factor decreased as DO increased from 0.35 to 3.5 mg O2/L. The analysis of the process data using a mathematical N2O model incorporating both the AOB denitrification and hydroxylamine (NH2OH) oxidation pathways indicated that the contribution of AOB denitrification pathway increased as [Formula: see text] concentration increased, but decreased as DO concentration increased, accompanied by a corresponding change in the contribution of NH2OH oxidation pathway to N2O production. The AOB denitrification pathway was predominant in most cases, with the NH2OH oxidation pathway making a comparable contribution only at high DO level (e.g. 3.5 mg O2/L). Nutzungsrecht: Copyright © 2015 Elsevier Ltd. All rights reserved. Nitrous Oxide - metabolism Bacteria - metabolism Nitrites - metabolism Bioreactors - microbiology Sewage - microbiology Ammonia - metabolism Oxygen - metabolism Ni, Bing-Jie oth Ye, Liu oth Yuan, Zhiguo oth Enthalten in Water research Amsterdam [u.a.] : Elsevier, Pergamon, 1967 73(2015), Seite 29-36 (DE-627)129471860 (DE-600)202613-2 (DE-576)014841630 0043-1354 nnns volume:73 year:2015 pages:29-36 http://dx.doi.org/10.1016/j.watres.2015.01.021 Volltext http://www.ncbi.nlm.nih.gov/pubmed/25644626 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-TEC SSG-OPC-GGO GBV_ILN_20 GBV_ILN_21 GBV_ILN_70 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4219 AR 73 2015 29-36 |
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10.1016/j.watres.2015.01.021 doi PQ20160617 (DE-627)OLC1963551141 (DE-599)GBVOLC1963551141 (PRQ)c1574-e4d8c0bc47f1a75806b613d1edd5a8d4ef902984ee4a1c5a785fe2e20b3470470 (KEY)0018203620150000073000000029combinedeffectofdissolvedoxygenandnitriteonn2oprod DE-627 ger DE-627 rakwb eng 550 DNB Peng, Lai verfasserin aut The combined effect of dissolved oxygen and nitrite on N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Both nitrite [Formula: see text] and dissolved oxygen (DO) play important roles in nitrous oxide (N2O) production by ammonia oxidizing bacteria (AOB). However, few studies focused on the combined effect of them on N2O production by AOB as well as the corresponding mechanisms. In this study, N2O production by an enriched nitrifying sludge, consisting of both AOB and nitrite-oxidizing bacteria (NOB), was investigated under various [Formula: see text] and DO concentrations. At each investigated DO level, both the biomass specific N2O production rate and the N2O emission factor (the ratio between N2O nitrogen emitted and the ammonium nitrogen converted) increased as [Formula: see text] concentration increased from 3 mg N/L to 50 mg N/L. However, at each investigated [Formula: see text] level, the maximum biomass specific N2O production rate occurred at DO of 0.85 mg O2/L, while the N2O emission factor decreased as DO increased from 0.35 to 3.5 mg O2/L. The analysis of the process data using a mathematical N2O model incorporating both the AOB denitrification and hydroxylamine (NH2OH) oxidation pathways indicated that the contribution of AOB denitrification pathway increased as [Formula: see text] concentration increased, but decreased as DO concentration increased, accompanied by a corresponding change in the contribution of NH2OH oxidation pathway to N2O production. The AOB denitrification pathway was predominant in most cases, with the NH2OH oxidation pathway making a comparable contribution only at high DO level (e.g. 3.5 mg O2/L). Nutzungsrecht: Copyright © 2015 Elsevier Ltd. All rights reserved. Nitrous Oxide - metabolism Bacteria - metabolism Nitrites - metabolism Bioreactors - microbiology Sewage - microbiology Ammonia - metabolism Oxygen - metabolism Ni, Bing-Jie oth Ye, Liu oth Yuan, Zhiguo oth Enthalten in Water research Amsterdam [u.a.] : Elsevier, Pergamon, 1967 73(2015), Seite 29-36 (DE-627)129471860 (DE-600)202613-2 (DE-576)014841630 0043-1354 nnns volume:73 year:2015 pages:29-36 http://dx.doi.org/10.1016/j.watres.2015.01.021 Volltext http://www.ncbi.nlm.nih.gov/pubmed/25644626 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-TEC SSG-OPC-GGO GBV_ILN_20 GBV_ILN_21 GBV_ILN_70 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4219 AR 73 2015 29-36 |
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10.1016/j.watres.2015.01.021 doi PQ20160617 (DE-627)OLC1963551141 (DE-599)GBVOLC1963551141 (PRQ)c1574-e4d8c0bc47f1a75806b613d1edd5a8d4ef902984ee4a1c5a785fe2e20b3470470 (KEY)0018203620150000073000000029combinedeffectofdissolvedoxygenandnitriteonn2oprod DE-627 ger DE-627 rakwb eng 550 DNB Peng, Lai verfasserin aut The combined effect of dissolved oxygen and nitrite on N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Both nitrite [Formula: see text] and dissolved oxygen (DO) play important roles in nitrous oxide (N2O) production by ammonia oxidizing bacteria (AOB). However, few studies focused on the combined effect of them on N2O production by AOB as well as the corresponding mechanisms. In this study, N2O production by an enriched nitrifying sludge, consisting of both AOB and nitrite-oxidizing bacteria (NOB), was investigated under various [Formula: see text] and DO concentrations. At each investigated DO level, both the biomass specific N2O production rate and the N2O emission factor (the ratio between N2O nitrogen emitted and the ammonium nitrogen converted) increased as [Formula: see text] concentration increased from 3 mg N/L to 50 mg N/L. However, at each investigated [Formula: see text] level, the maximum biomass specific N2O production rate occurred at DO of 0.85 mg O2/L, while the N2O emission factor decreased as DO increased from 0.35 to 3.5 mg O2/L. The analysis of the process data using a mathematical N2O model incorporating both the AOB denitrification and hydroxylamine (NH2OH) oxidation pathways indicated that the contribution of AOB denitrification pathway increased as [Formula: see text] concentration increased, but decreased as DO concentration increased, accompanied by a corresponding change in the contribution of NH2OH oxidation pathway to N2O production. The AOB denitrification pathway was predominant in most cases, with the NH2OH oxidation pathway making a comparable contribution only at high DO level (e.g. 3.5 mg O2/L). Nutzungsrecht: Copyright © 2015 Elsevier Ltd. All rights reserved. Nitrous Oxide - metabolism Bacteria - metabolism Nitrites - metabolism Bioreactors - microbiology Sewage - microbiology Ammonia - metabolism Oxygen - metabolism Ni, Bing-Jie oth Ye, Liu oth Yuan, Zhiguo oth Enthalten in Water research Amsterdam [u.a.] : Elsevier, Pergamon, 1967 73(2015), Seite 29-36 (DE-627)129471860 (DE-600)202613-2 (DE-576)014841630 0043-1354 nnns volume:73 year:2015 pages:29-36 http://dx.doi.org/10.1016/j.watres.2015.01.021 Volltext http://www.ncbi.nlm.nih.gov/pubmed/25644626 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-TEC SSG-OPC-GGO GBV_ILN_20 GBV_ILN_21 GBV_ILN_70 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4219 AR 73 2015 29-36 |
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10.1016/j.watres.2015.01.021 doi PQ20160617 (DE-627)OLC1963551141 (DE-599)GBVOLC1963551141 (PRQ)c1574-e4d8c0bc47f1a75806b613d1edd5a8d4ef902984ee4a1c5a785fe2e20b3470470 (KEY)0018203620150000073000000029combinedeffectofdissolvedoxygenandnitriteonn2oprod DE-627 ger DE-627 rakwb eng 550 DNB Peng, Lai verfasserin aut The combined effect of dissolved oxygen and nitrite on N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Both nitrite [Formula: see text] and dissolved oxygen (DO) play important roles in nitrous oxide (N2O) production by ammonia oxidizing bacteria (AOB). However, few studies focused on the combined effect of them on N2O production by AOB as well as the corresponding mechanisms. In this study, N2O production by an enriched nitrifying sludge, consisting of both AOB and nitrite-oxidizing bacteria (NOB), was investigated under various [Formula: see text] and DO concentrations. At each investigated DO level, both the biomass specific N2O production rate and the N2O emission factor (the ratio between N2O nitrogen emitted and the ammonium nitrogen converted) increased as [Formula: see text] concentration increased from 3 mg N/L to 50 mg N/L. However, at each investigated [Formula: see text] level, the maximum biomass specific N2O production rate occurred at DO of 0.85 mg O2/L, while the N2O emission factor decreased as DO increased from 0.35 to 3.5 mg O2/L. The analysis of the process data using a mathematical N2O model incorporating both the AOB denitrification and hydroxylamine (NH2OH) oxidation pathways indicated that the contribution of AOB denitrification pathway increased as [Formula: see text] concentration increased, but decreased as DO concentration increased, accompanied by a corresponding change in the contribution of NH2OH oxidation pathway to N2O production. The AOB denitrification pathway was predominant in most cases, with the NH2OH oxidation pathway making a comparable contribution only at high DO level (e.g. 3.5 mg O2/L). Nutzungsrecht: Copyright © 2015 Elsevier Ltd. All rights reserved. Nitrous Oxide - metabolism Bacteria - metabolism Nitrites - metabolism Bioreactors - microbiology Sewage - microbiology Ammonia - metabolism Oxygen - metabolism Ni, Bing-Jie oth Ye, Liu oth Yuan, Zhiguo oth Enthalten in Water research Amsterdam [u.a.] : Elsevier, Pergamon, 1967 73(2015), Seite 29-36 (DE-627)129471860 (DE-600)202613-2 (DE-576)014841630 0043-1354 nnns volume:73 year:2015 pages:29-36 http://dx.doi.org/10.1016/j.watres.2015.01.021 Volltext http://www.ncbi.nlm.nih.gov/pubmed/25644626 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-TEC SSG-OPC-GGO GBV_ILN_20 GBV_ILN_21 GBV_ILN_70 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4219 AR 73 2015 29-36 |
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10.1016/j.watres.2015.01.021 doi PQ20160617 (DE-627)OLC1963551141 (DE-599)GBVOLC1963551141 (PRQ)c1574-e4d8c0bc47f1a75806b613d1edd5a8d4ef902984ee4a1c5a785fe2e20b3470470 (KEY)0018203620150000073000000029combinedeffectofdissolvedoxygenandnitriteonn2oprod DE-627 ger DE-627 rakwb eng 550 DNB Peng, Lai verfasserin aut The combined effect of dissolved oxygen and nitrite on N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Both nitrite [Formula: see text] and dissolved oxygen (DO) play important roles in nitrous oxide (N2O) production by ammonia oxidizing bacteria (AOB). However, few studies focused on the combined effect of them on N2O production by AOB as well as the corresponding mechanisms. In this study, N2O production by an enriched nitrifying sludge, consisting of both AOB and nitrite-oxidizing bacteria (NOB), was investigated under various [Formula: see text] and DO concentrations. At each investigated DO level, both the biomass specific N2O production rate and the N2O emission factor (the ratio between N2O nitrogen emitted and the ammonium nitrogen converted) increased as [Formula: see text] concentration increased from 3 mg N/L to 50 mg N/L. However, at each investigated [Formula: see text] level, the maximum biomass specific N2O production rate occurred at DO of 0.85 mg O2/L, while the N2O emission factor decreased as DO increased from 0.35 to 3.5 mg O2/L. The analysis of the process data using a mathematical N2O model incorporating both the AOB denitrification and hydroxylamine (NH2OH) oxidation pathways indicated that the contribution of AOB denitrification pathway increased as [Formula: see text] concentration increased, but decreased as DO concentration increased, accompanied by a corresponding change in the contribution of NH2OH oxidation pathway to N2O production. The AOB denitrification pathway was predominant in most cases, with the NH2OH oxidation pathway making a comparable contribution only at high DO level (e.g. 3.5 mg O2/L). Nutzungsrecht: Copyright © 2015 Elsevier Ltd. All rights reserved. Nitrous Oxide - metabolism Bacteria - metabolism Nitrites - metabolism Bioreactors - microbiology Sewage - microbiology Ammonia - metabolism Oxygen - metabolism Ni, Bing-Jie oth Ye, Liu oth Yuan, Zhiguo oth Enthalten in Water research Amsterdam [u.a.] : Elsevier, Pergamon, 1967 73(2015), Seite 29-36 (DE-627)129471860 (DE-600)202613-2 (DE-576)014841630 0043-1354 nnns volume:73 year:2015 pages:29-36 http://dx.doi.org/10.1016/j.watres.2015.01.021 Volltext http://www.ncbi.nlm.nih.gov/pubmed/25644626 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-TEC SSG-OPC-GGO GBV_ILN_20 GBV_ILN_21 GBV_ILN_70 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4219 AR 73 2015 29-36 |
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However, few studies focused on the combined effect of them on N2O production by AOB as well as the corresponding mechanisms. In this study, N2O production by an enriched nitrifying sludge, consisting of both AOB and nitrite-oxidizing bacteria (NOB), was investigated under various [Formula: see text] and DO concentrations. At each investigated DO level, both the biomass specific N2O production rate and the N2O emission factor (the ratio between N2O nitrogen emitted and the ammonium nitrogen converted) increased as [Formula: see text] concentration increased from 3 mg N/L to 50 mg N/L. However, at each investigated [Formula: see text] level, the maximum biomass specific N2O production rate occurred at DO of 0.85 mg O2/L, while the N2O emission factor decreased as DO increased from 0.35 to 3.5 mg O2/L. The analysis of the process data using a mathematical N2O model incorporating both the AOB denitrification and hydroxylamine (NH2OH) oxidation pathways indicated that the contribution of AOB denitrification pathway increased as [Formula: see text] concentration increased, but decreased as DO concentration increased, accompanied by a corresponding change in the contribution of NH2OH oxidation pathway to N2O production. The AOB denitrification pathway was predominant in most cases, with the NH2OH oxidation pathway making a comparable contribution only at high DO level (e.g. 3.5 mg O2/L).</subfield></datafield><datafield tag="540" ind1=" " ind2=" "><subfield code="a">Nutzungsrecht: Copyright © 2015 Elsevier Ltd. 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Peng, Lai ddc 550 misc Nitrous Oxide - metabolism misc Bacteria - metabolism misc Nitrites - metabolism misc Bioreactors - microbiology misc Sewage - microbiology misc Ammonia - metabolism misc Oxygen - metabolism The combined effect of dissolved oxygen and nitrite on N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge |
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The combined effect of dissolved oxygen and nitrite on N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge |
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combined effect of dissolved oxygen and nitrite on n2o production by ammonia oxidizing bacteria in an enriched nitrifying sludge |
| title_auth |
The combined effect of dissolved oxygen and nitrite on N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge |
| abstract |
Both nitrite [Formula: see text] and dissolved oxygen (DO) play important roles in nitrous oxide (N2O) production by ammonia oxidizing bacteria (AOB). However, few studies focused on the combined effect of them on N2O production by AOB as well as the corresponding mechanisms. In this study, N2O production by an enriched nitrifying sludge, consisting of both AOB and nitrite-oxidizing bacteria (NOB), was investigated under various [Formula: see text] and DO concentrations. At each investigated DO level, both the biomass specific N2O production rate and the N2O emission factor (the ratio between N2O nitrogen emitted and the ammonium nitrogen converted) increased as [Formula: see text] concentration increased from 3 mg N/L to 50 mg N/L. However, at each investigated [Formula: see text] level, the maximum biomass specific N2O production rate occurred at DO of 0.85 mg O2/L, while the N2O emission factor decreased as DO increased from 0.35 to 3.5 mg O2/L. The analysis of the process data using a mathematical N2O model incorporating both the AOB denitrification and hydroxylamine (NH2OH) oxidation pathways indicated that the contribution of AOB denitrification pathway increased as [Formula: see text] concentration increased, but decreased as DO concentration increased, accompanied by a corresponding change in the contribution of NH2OH oxidation pathway to N2O production. The AOB denitrification pathway was predominant in most cases, with the NH2OH oxidation pathway making a comparable contribution only at high DO level (e.g. 3.5 mg O2/L). |
| abstractGer |
Both nitrite [Formula: see text] and dissolved oxygen (DO) play important roles in nitrous oxide (N2O) production by ammonia oxidizing bacteria (AOB). However, few studies focused on the combined effect of them on N2O production by AOB as well as the corresponding mechanisms. In this study, N2O production by an enriched nitrifying sludge, consisting of both AOB and nitrite-oxidizing bacteria (NOB), was investigated under various [Formula: see text] and DO concentrations. At each investigated DO level, both the biomass specific N2O production rate and the N2O emission factor (the ratio between N2O nitrogen emitted and the ammonium nitrogen converted) increased as [Formula: see text] concentration increased from 3 mg N/L to 50 mg N/L. However, at each investigated [Formula: see text] level, the maximum biomass specific N2O production rate occurred at DO of 0.85 mg O2/L, while the N2O emission factor decreased as DO increased from 0.35 to 3.5 mg O2/L. The analysis of the process data using a mathematical N2O model incorporating both the AOB denitrification and hydroxylamine (NH2OH) oxidation pathways indicated that the contribution of AOB denitrification pathway increased as [Formula: see text] concentration increased, but decreased as DO concentration increased, accompanied by a corresponding change in the contribution of NH2OH oxidation pathway to N2O production. The AOB denitrification pathway was predominant in most cases, with the NH2OH oxidation pathway making a comparable contribution only at high DO level (e.g. 3.5 mg O2/L). |
| abstract_unstemmed |
Both nitrite [Formula: see text] and dissolved oxygen (DO) play important roles in nitrous oxide (N2O) production by ammonia oxidizing bacteria (AOB). However, few studies focused on the combined effect of them on N2O production by AOB as well as the corresponding mechanisms. In this study, N2O production by an enriched nitrifying sludge, consisting of both AOB and nitrite-oxidizing bacteria (NOB), was investigated under various [Formula: see text] and DO concentrations. At each investigated DO level, both the biomass specific N2O production rate and the N2O emission factor (the ratio between N2O nitrogen emitted and the ammonium nitrogen converted) increased as [Formula: see text] concentration increased from 3 mg N/L to 50 mg N/L. However, at each investigated [Formula: see text] level, the maximum biomass specific N2O production rate occurred at DO of 0.85 mg O2/L, while the N2O emission factor decreased as DO increased from 0.35 to 3.5 mg O2/L. The analysis of the process data using a mathematical N2O model incorporating both the AOB denitrification and hydroxylamine (NH2OH) oxidation pathways indicated that the contribution of AOB denitrification pathway increased as [Formula: see text] concentration increased, but decreased as DO concentration increased, accompanied by a corresponding change in the contribution of NH2OH oxidation pathway to N2O production. The AOB denitrification pathway was predominant in most cases, with the NH2OH oxidation pathway making a comparable contribution only at high DO level (e.g. 3.5 mg O2/L). |
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| title_short |
The combined effect of dissolved oxygen and nitrite on N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge |
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http://dx.doi.org/10.1016/j.watres.2015.01.021 http://www.ncbi.nlm.nih.gov/pubmed/25644626 |
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