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Titolo:
Nitrous oxide production in high-loading biological nitrogen removal process under low COD/N ratio condition
Autore:
Itokawa, H; Hanaki, K; Matsuo, T;
Indirizzi:
Univ Tokyo, Dept Urban Engn, Bunkyo Ku, Tokyo 1138656, Japan Univ Tokyo Tokyo Japan 1138656 ban Engn, Bunkyo Ku, Tokyo 1138656, Japan
Titolo Testata:
WATER RESEARCH
fascicolo: 3, volume: 35, anno: 2001,
pagine: 657 - 664
SICI:
0043-1354(200103)35:3<657:NOPIHB>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
WASTE-WATER TREATMENT; TREATMENT-PLANT; NITROSOMONAS-EUROPAEA; ACTIVATED-SLUDGE; DENITRIFICATION; NITRITE; NITRIFICATION; NITRATE; OXYGEN; SOIL;
Keywords:
nitrous oxide; nitrification; denitrification; COD/N ratio; intermittent aeration; activated sludge; nitrogen removal; N-15; greenhouse gas;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Itokawa, H Japan Sewage Works Agcy, Res & Technol Dev Div, 5141 Shimosasame, Toda, Saitama 3350037, Japan Japan Sewage Works Agcy 5141 Shimosasame Toda Saitama Japan 3350037
Citazione:
H. Itokawa et al., "Nitrous oxide production in high-loading biological nitrogen removal process under low COD/N ratio condition", WATER RES, 35(3), 2001, pp. 657-664

Abstract

Effects of influent COD/N ratio on N2O emission from a biological nitrogenremoval process with intermittent aeration: supplied with high-strength wastewater, were investigated with laboratory-scale bioreactors. Furthermore,the mechanism of N2O production in the bioreactor supplied with low COD/N ratio wastewater was studied using N-15 tracer method, measuring of reduction rates in denitrification pathway, and conducting batch experiments underdenitrifying condition. In steady-state operation, 20-30% of influent nitrogen was emitted as N2O in the bioreactors with influent COD/N ratio less than 3.5. A N-15 tracer study showed that this N2O originated from denitrification in anoxic phase. However, N2O reduction capacity of denitrifiers wasalways larger than NO3--N or NO2--N reduction capacity. II was suggested that a high N2O emission rate under low COD/N ratio operations was mainly due to endogenous denitrification with NO2--N in the later part of anoxic phase. This NO2--N build-up was attributed to the difference between NO3--N and NO2--N reduction capacities, which was the feature observed only in low COD/N ratio operations. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 04:23:48