Control of nitrification efficiency in a new biofilm reactor
Autor(a) principal: | |
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Data de Publicação: | 1997 |
Outros Autores: | , , |
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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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 |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
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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1799132205688029184 |