Hydrodynamic studies in an airlift reactor with an enlarged degassing zone

Detalhes bibliográficos
Autor(a) principal: Freitas, Carla Maria Duarte de
Data de Publicação: 1998
Outros Autores: Teixeira, J. A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: https://hdl.handle.net/1822/1448
Resumo: The hydrodynamic behaviour of a 60 l threephase airlift bioreactor, of the concentric draught tube type, with an enlarged degassing zone has been studied. Ca-alginate beads were used as the solid phase. Airflow rate (from 1.9 to 90.2 l/min), solids loading (0% to 40% (v/v)) and solids density (1016 and 1038 kg/m³) were manipulated and their influence on solids and gas holdup, circulation and mixing times and in the interstitial liquid velocity was determined. Riser and downcomer solids holdup was found to decrease with the increase of airflow rate and to increase with solids loading and density. On the contrary, gas holdup in the riser and in the downcomer increased with airflow rate and decreased with solids loading and density. By increasing airflow rate, a decrease in circulation time was observed while the effects of solids loading and density were negligible. Mixing time decreased with airflow rate, increased with solids density, in the studied range, and presented a maximum for solids loading of approximately 20% (v/v).
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spelling Hydrodynamic studies in an airlift reactor with an enlarged degassing zoneScience & TechnologyThe hydrodynamic behaviour of a 60 l threephase airlift bioreactor, of the concentric draught tube type, with an enlarged degassing zone has been studied. Ca-alginate beads were used as the solid phase. Airflow rate (from 1.9 to 90.2 l/min), solids loading (0% to 40% (v/v)) and solids density (1016 and 1038 kg/m³) were manipulated and their influence on solids and gas holdup, circulation and mixing times and in the interstitial liquid velocity was determined. Riser and downcomer solids holdup was found to decrease with the increase of airflow rate and to increase with solids loading and density. On the contrary, gas holdup in the riser and in the downcomer increased with airflow rate and decreased with solids loading and density. By increasing airflow rate, a decrease in circulation time was observed while the effects of solids loading and density were negligible. Mixing time decreased with airflow rate, increased with solids density, in the studied range, and presented a maximum for solids loading of approximately 20% (v/v).Junta Nacional de Investigação Científica e Tecnológica (JNICT); Instituto de Biotecnologia e Química Fina (IBQF) - GGP XXI/BD/2937/96.Springer VerlagUniversidade do MinhoFreitas, Carla Maria Duarte deTeixeira, J. A.19981998-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/1822/1448engFreitas, C., Teixeira, J. Hydrodynamic studies in an airlift reactor with an enlarged degassing zone. Bioprocess Engineering 18, 267–279 (1998). https://doi.org/10.1007/s0044900504410178-515X10.1007/s004490050441info: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:RCAAP2023-07-21T12:28:09Zoai:repositorium.sdum.uminho.pt:1822/1448Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:22:54.011053Repositório 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 Hydrodynamic studies in an airlift reactor with an enlarged degassing zone
title Hydrodynamic studies in an airlift reactor with an enlarged degassing zone
spellingShingle Hydrodynamic studies in an airlift reactor with an enlarged degassing zone
Freitas, Carla Maria Duarte de
Science & Technology
title_short Hydrodynamic studies in an airlift reactor with an enlarged degassing zone
title_full Hydrodynamic studies in an airlift reactor with an enlarged degassing zone
title_fullStr Hydrodynamic studies in an airlift reactor with an enlarged degassing zone
title_full_unstemmed Hydrodynamic studies in an airlift reactor with an enlarged degassing zone
title_sort Hydrodynamic studies in an airlift reactor with an enlarged degassing zone
author Freitas, Carla Maria Duarte de
author_facet Freitas, Carla Maria Duarte de
Teixeira, J. A.
author_role author
author2 Teixeira, J. A.
author2_role author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Freitas, Carla Maria Duarte de
Teixeira, J. A.
dc.subject.por.fl_str_mv Science & Technology
topic Science & Technology
description The hydrodynamic behaviour of a 60 l threephase airlift bioreactor, of the concentric draught tube type, with an enlarged degassing zone has been studied. Ca-alginate beads were used as the solid phase. Airflow rate (from 1.9 to 90.2 l/min), solids loading (0% to 40% (v/v)) and solids density (1016 and 1038 kg/m³) were manipulated and their influence on solids and gas holdup, circulation and mixing times and in the interstitial liquid velocity was determined. Riser and downcomer solids holdup was found to decrease with the increase of airflow rate and to increase with solids loading and density. On the contrary, gas holdup in the riser and in the downcomer increased with airflow rate and decreased with solids loading and density. By increasing airflow rate, a decrease in circulation time was observed while the effects of solids loading and density were negligible. Mixing time decreased with airflow rate, increased with solids density, in the studied range, and presented a maximum for solids loading of approximately 20% (v/v).
publishDate 1998
dc.date.none.fl_str_mv 1998
1998-01-01T00:00:00Z
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 https://hdl.handle.net/1822/1448
url https://hdl.handle.net/1822/1448
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Freitas, C., Teixeira, J. Hydrodynamic studies in an airlift reactor with an enlarged degassing zone. Bioprocess Engineering 18, 267–279 (1998). https://doi.org/10.1007/s004490050441
0178-515X
10.1007/s004490050441
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 Springer Verlag
publisher.none.fl_str_mv Springer Verlag
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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