Control of nitrification efficiency in a new biofilm reactor

Detalhes bibliográficos
Autor(a) principal: Lazarova, V.
Data de Publicação: 1997
Outros Autores: Nogueira, R., Manem, J., Melo, L. F.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/1577
Resumo: The study of the nitrification capacity of a new gas-lift circulating bed reactor (CBR) carried out with laboratory and industrial scale prototypes, showed a high nitrification rate (1.2-2 kgN mˉ³ dˉ¹) without any nitrite accumulation. A good nitrification performance 0.5-0.6 kgN mˉ³dˉ¹ was maintained even when the CODs/N-NH4 ratio was increased up to 1.8-3.4 (laboratory CBR) and 4-10 (industrial prototype). The comparison of the apparent and intrinsic kinetics indicates that the CBR ensures high specific nitrification rates close to the maximum value. These results indicates an effective control of the attached biomass growth and activity in this type of bioreactor. The intinsic kinetics and diffusion limitations were studied by respirometric tests. It was demonstrated that apparent kinetics are zero-order for bulk concentrations of ammonia above 2 mgN lˉ¹ and half-order for lower substrate concentrations. The diffusivity values calculated using the half-order diffusion-reaction model are in the range of 1.09x10ˉ9 to 1.58x10ˉ9 m² sˉ¹ for ammonia nitrogen and of 1.1x10ˉ9 to 1.37x10ˉ9 m² sˉ¹ for nitrite within the range of tempperature studied (16-28ºC). The application of the diffusion-reaction model requires a very precise determination of the biofilm thickness or density. In the case of biofilms developed in heterogeneous granular surfaces, new methods have to be developed for the best estimation of the biofilm density and active cells distribution. In conclusion it can be stated that this new three-phase bioreactor ensures a high nitrification rate and enhanced process stability through an effective biofilm control. The CBR is a good tool for more fundamental studies of biofilm kinetics and activity thanks to the homogeneous distribution of the fixed biomass in the reactor.
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spelling Control of nitrification efficiency in a new biofilm reactorNitrificationKineticsWastewater treatmentNew bioreactorFloating mediaCirculating bedSpecific nitrification rateDiffusion-reaction modelScience & TechnologyThe study of the nitrification capacity of a new gas-lift circulating bed reactor (CBR) carried out with laboratory and industrial scale prototypes, showed a high nitrification rate (1.2-2 kgN mˉ³ dˉ¹) without any nitrite accumulation. A good nitrification performance 0.5-0.6 kgN mˉ³dˉ¹ was maintained even when the CODs/N-NH4 ratio was increased up to 1.8-3.4 (laboratory CBR) and 4-10 (industrial prototype). The comparison of the apparent and intrinsic kinetics indicates that the CBR ensures high specific nitrification rates close to the maximum value. These results indicates an effective control of the attached biomass growth and activity in this type of bioreactor. The intinsic kinetics and diffusion limitations were studied by respirometric tests. It was demonstrated that apparent kinetics are zero-order for bulk concentrations of ammonia above 2 mgN lˉ¹ and half-order for lower substrate concentrations. The diffusivity values calculated using the half-order diffusion-reaction model are in the range of 1.09x10ˉ9 to 1.58x10ˉ9 m² sˉ¹ for ammonia nitrogen and of 1.1x10ˉ9 to 1.37x10ˉ9 m² sˉ¹ for nitrite within the range of tempperature studied (16-28ºC). The application of the diffusion-reaction model requires a very precise determination of the biofilm thickness or density. In the case of biofilms developed in heterogeneous granular surfaces, new methods have to be developed for the best estimation of the biofilm density and active cells distribution. In conclusion it can be stated that this new three-phase bioreactor ensures a high nitrification rate and enhanced process stability through an effective biofilm control. The CBR is a good tool for more fundamental studies of biofilm kinetics and activity thanks to the homogeneous distribution of the fixed biomass in the reactor.ElsevierUniversidade do MinhoLazarova, V.Nogueira, R.Manem, J.Melo, L. F.19971997-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/1577eng"Water science and technology". ISSN 0273-1223. 36:1 (1997) 31-41.0273-122310.1016/S0273-1223(97)00320-Xinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T11:55:48Zoai:repositorium.sdum.uminho.pt:1822/1577Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T18:45:21.244863Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Control of nitrification efficiency in a new biofilm reactor
title Control of nitrification efficiency in a new biofilm reactor
spellingShingle Control of nitrification efficiency in a new biofilm reactor
Lazarova, V.
Nitrification
Kinetics
Wastewater treatment
New bioreactor
Floating media
Circulating bed
Specific nitrification rate
Diffusion-reaction model
Science & Technology
title_short Control of nitrification efficiency in a new biofilm reactor
title_full Control of nitrification efficiency in a new biofilm reactor
title_fullStr Control of nitrification efficiency in a new biofilm reactor
title_full_unstemmed Control of nitrification efficiency in a new biofilm reactor
title_sort Control of nitrification efficiency in a new biofilm reactor
author Lazarova, V.
author_facet Lazarova, V.
Nogueira, R.
Manem, J.
Melo, L. F.
author_role author
author2 Nogueira, R.
Manem, J.
Melo, L. F.
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Lazarova, V.
Nogueira, R.
Manem, J.
Melo, L. F.
dc.subject.por.fl_str_mv Nitrification
Kinetics
Wastewater treatment
New bioreactor
Floating media
Circulating bed
Specific nitrification rate
Diffusion-reaction model
Science & Technology
topic Nitrification
Kinetics
Wastewater treatment
New bioreactor
Floating media
Circulating bed
Specific nitrification rate
Diffusion-reaction model
Science & Technology
description The study of the nitrification capacity of a new gas-lift circulating bed reactor (CBR) carried out with laboratory and industrial scale prototypes, showed a high nitrification rate (1.2-2 kgN mˉ³ dˉ¹) without any nitrite accumulation. A good nitrification performance 0.5-0.6 kgN mˉ³dˉ¹ was maintained even when the CODs/N-NH4 ratio was increased up to 1.8-3.4 (laboratory CBR) and 4-10 (industrial prototype). The comparison of the apparent and intrinsic kinetics indicates that the CBR ensures high specific nitrification rates close to the maximum value. These results indicates an effective control of the attached biomass growth and activity in this type of bioreactor. The intinsic kinetics and diffusion limitations were studied by respirometric tests. It was demonstrated that apparent kinetics are zero-order for bulk concentrations of ammonia above 2 mgN lˉ¹ and half-order for lower substrate concentrations. The diffusivity values calculated using the half-order diffusion-reaction model are in the range of 1.09x10ˉ9 to 1.58x10ˉ9 m² sˉ¹ for ammonia nitrogen and of 1.1x10ˉ9 to 1.37x10ˉ9 m² sˉ¹ for nitrite within the range of tempperature studied (16-28ºC). The application of the diffusion-reaction model requires a very precise determination of the biofilm thickness or density. In the case of biofilms developed in heterogeneous granular surfaces, new methods have to be developed for the best estimation of the biofilm density and active cells distribution. In conclusion it can be stated that this new three-phase bioreactor ensures a high nitrification rate and enhanced process stability through an effective biofilm control. The CBR is a good tool for more fundamental studies of biofilm kinetics and activity thanks to the homogeneous distribution of the fixed biomass in the reactor.
publishDate 1997
dc.date.none.fl_str_mv 1997
1997-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/1822/1577
url http://hdl.handle.net/1822/1577
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv "Water science and technology". ISSN 0273-1223. 36:1 (1997) 31-41.
0273-1223
10.1016/S0273-1223(97)00320-X
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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