Improvement of nitrate and nitrite reduction rates prediction

Reported models of denitrification rates integrate in an unique parameter the pH-dependent inhibition by HNO2 and the pH effect on the bacterial metabolic activity; furthermore, they do not quantify separately the pH effect on the nitrate and on the nitrite reduction rates. The goal of this work was...

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Autores principales:	Estuardo,Carolina, Martí,M. Cristina, Huiliñir,César, Aspé Lillo,Estrella, Roeckel von Bennewitz,Marlene
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso 2008
Materias:	denitrification kinetics nitrate reduction nitrite reduction pH
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300008
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spelling	oai:scielo:S0717-345820080003000082009-01-30Improvement of nitrate and nitrite reduction rates predictionEstuardo,CarolinaMartí,M. CristinaHuiliñir,CésarAspé Lillo,EstrellaRoeckel von Bennewitz,Marlene denitrification kinetics nitrate reduction nitrite reduction pH Reported models of denitrification rates integrate in an unique parameter the pH-dependent inhibition by HNO2 and the pH effect on the bacterial metabolic activity; furthermore, they do not quantify separately the pH effect on the nitrate and on the nitrite reduction rates. The goal of this work was to quantify both effects on the kinetics of nitrate and nitrite reduction to improve the models’ predictive value. Assays were performed at a pH range of 6.5-9.0 in batch reactors at 37ºC with an activated sludge. At the studied pH range and at below the HNO2 inhibitory concentration (0.004 mg L-1), the maximum nitrate reduction rate diminished 23% and 50% by decreasing or increasing, respectively, one pH unit from 8.0. The maximum nitrite reduction at pH 8.0 diminished 15% at pH 7.0 and 40% at pH 9.0. At HNO2 concentrations over the inhibitory concentration, except at pH > 8.0, the maximum nitrate reduction rate diminished 50% upon decreasing the pH from 8.0 to 7.0 or increasing it from 8.0 to 9.0. Inclusion of the pH effect in the reported models improved their predictive value; average deviations from the experimental data were reduced from 53% to 10.7% or 33.8% to 10.5% for nitrite and nitrate reduction rates, respectively.info:eu-repo/semantics/openAccessPontificia Universidad Católica de ValparaísoElectronic Journal of Biotechnology v.11 n.3 20082008-07-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300008en10.4067/S0717-34582008000300008
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	denitrification kinetics nitrate reduction nitrite reduction pH
spellingShingle	denitrification kinetics nitrate reduction nitrite reduction pH Estuardo,Carolina Martí,M. Cristina Huiliñir,César Aspé Lillo,Estrella Roeckel von Bennewitz,Marlene Improvement of nitrate and nitrite reduction rates prediction
description	Reported models of denitrification rates integrate in an unique parameter the pH-dependent inhibition by HNO2 and the pH effect on the bacterial metabolic activity; furthermore, they do not quantify separately the pH effect on the nitrate and on the nitrite reduction rates. The goal of this work was to quantify both effects on the kinetics of nitrate and nitrite reduction to improve the models’ predictive value. Assays were performed at a pH range of 6.5-9.0 in batch reactors at 37ºC with an activated sludge. At the studied pH range and at below the HNO2 inhibitory concentration (0.004 mg L-1), the maximum nitrate reduction rate diminished 23% and 50% by decreasing or increasing, respectively, one pH unit from 8.0. The maximum nitrite reduction at pH 8.0 diminished 15% at pH 7.0 and 40% at pH 9.0. At HNO2 concentrations over the inhibitory concentration, except at pH > 8.0, the maximum nitrate reduction rate diminished 50% upon decreasing the pH from 8.0 to 7.0 or increasing it from 8.0 to 9.0. Inclusion of the pH effect in the reported models improved their predictive value; average deviations from the experimental data were reduced from 53% to 10.7% or 33.8% to 10.5% for nitrite and nitrate reduction rates, respectively.
author	Estuardo,Carolina Martí,M. Cristina Huiliñir,César Aspé Lillo,Estrella Roeckel von Bennewitz,Marlene
author_facet	Estuardo,Carolina Martí,M. Cristina Huiliñir,César Aspé Lillo,Estrella Roeckel von Bennewitz,Marlene
author_sort	Estuardo,Carolina
title	Improvement of nitrate and nitrite reduction rates prediction
title_short	Improvement of nitrate and nitrite reduction rates prediction
title_full	Improvement of nitrate and nitrite reduction rates prediction
title_fullStr	Improvement of nitrate and nitrite reduction rates prediction
title_full_unstemmed	Improvement of nitrate and nitrite reduction rates prediction
title_sort	improvement of nitrate and nitrite reduction rates prediction
publisher	Pontificia Universidad Católica de Valparaíso
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300008
work_keys_str_mv	AT estuardocarolina improvementofnitrateandnitritereductionratesprediction AT martimcristina improvementofnitrateandnitritereductionratesprediction AT huilinircesar improvementofnitrateandnitritereductionratesprediction AT aspelilloestrella improvementofnitrateandnitritereductionratesprediction AT roeckelvonbennewitzmarlene improvementofnitrateandnitritereductionratesprediction
_version_	1718441787171799040

Improvement of nitrate and nitrite reduction rates prediction

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