Influence of zinc on ferrous iron bio-oxidation: Biological or physical nature?
Ferrous iron bio-oxidation is negatively affected by the presence of heavy metals. Although the available information relates this phenomenon to purely biological aspects, it is contradictory with respect to tolerance levels, mechanisms and kinetics. This dispersion of results may be due to the empi...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2010 |
| País: | España |
| Institución: | Universidad de Sevilla (US) |
| Repositorio: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/156526 |
| Acceso en línea: | https://hdl.handle.net/11441/156526 https://doi.org/10.1016/j.bej.2009.12.018 |
| Access Level: | acceso abierto |
| Palabra clave: | Bio-oxidation Biofilm Bioreactor system Ferrous iron Immobilized cells Mass transfer Oxygen solubility Zinc tolerance |
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Influence of zinc on ferrous iron bio-oxidation: Biological or physical nature?Mazuelos Rojas, AlfonsoIglesias González, María NievesRomero Aleta, RafaelMejías, Miguel ÁngelCarranza Mora, FranciscoBio-oxidationBiofilmBioreactor systemFerrous ironImmobilized cellsMass transferOxygen solubilityZinc toleranceFerrous iron bio-oxidation is negatively affected by the presence of heavy metals. Although the available information relates this phenomenon to purely biological aspects, it is contradictory with respect to tolerance levels, mechanisms and kinetics. This dispersion of results may be due to the empirical nature of the approaches which are based on batch cultures and fail to consider the conditions of aeration of the biomass. In the present work, the influence of Zn2+ in the range of 0-40 g/L is tested in continuous packed-bed bioreactors, by studying oxygen partial pressure and aeration flow rate as variables. Results show that when oxygen is the limiting reagent under identical aeration conditions, the bio-oxidation rate decreases by 0.8% per gram per litre of Zn2+. The cause of this result is purely thermodynamic; the solubility of oxygen in the medium decreases in equivalent proportions of the bio-oxidation rate owing to the salting-out effect. This finding leads to redesign of reactors for continuous ferrous iron bio-oxidation with the presence of Zn2+, whereby special attention is paid to the aeration system and its control during the operation.European Commission NMP1- CT-500329-1ElsevierIngeniería QuímicaEuropean Commission (EC)2010info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/156526https://doi.org/10.1016/j.bej.2009.12.018reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésBiochemical Engineering Journal, 49 (2), 235-240.NMP1- CT-500329-1https://doi.org/10.1016/j.bej.2009.12.018info:eu-repo/semantics/openAccessoai:idus.us.es:11441/1565262026-06-17T12:51:07Z |
| dc.title.none.fl_str_mv |
Influence of zinc on ferrous iron bio-oxidation: Biological or physical nature? |
| title |
Influence of zinc on ferrous iron bio-oxidation: Biological or physical nature? |
| spellingShingle |
Influence of zinc on ferrous iron bio-oxidation: Biological or physical nature? Mazuelos Rojas, Alfonso Bio-oxidation Biofilm Bioreactor system Ferrous iron Immobilized cells Mass transfer Oxygen solubility Zinc tolerance |
| title_short |
Influence of zinc on ferrous iron bio-oxidation: Biological or physical nature? |
| title_full |
Influence of zinc on ferrous iron bio-oxidation: Biological or physical nature? |
| title_fullStr |
Influence of zinc on ferrous iron bio-oxidation: Biological or physical nature? |
| title_full_unstemmed |
Influence of zinc on ferrous iron bio-oxidation: Biological or physical nature? |
| title_sort |
Influence of zinc on ferrous iron bio-oxidation: Biological or physical nature? |
| dc.creator.none.fl_str_mv |
Mazuelos Rojas, Alfonso Iglesias González, María Nieves Romero Aleta, Rafael Mejías, Miguel Ángel Carranza Mora, Francisco |
| author |
Mazuelos Rojas, Alfonso |
| author_facet |
Mazuelos Rojas, Alfonso Iglesias González, María Nieves Romero Aleta, Rafael Mejías, Miguel Ángel Carranza Mora, Francisco |
| author_role |
author |
| author2 |
Iglesias González, María Nieves Romero Aleta, Rafael Mejías, Miguel Ángel Carranza Mora, Francisco |
| author2_role |
author author author author |
| dc.contributor.none.fl_str_mv |
Ingeniería Química European Commission (EC) |
| dc.subject.none.fl_str_mv |
Bio-oxidation Biofilm Bioreactor system Ferrous iron Immobilized cells Mass transfer Oxygen solubility Zinc tolerance |
| topic |
Bio-oxidation Biofilm Bioreactor system Ferrous iron Immobilized cells Mass transfer Oxygen solubility Zinc tolerance |
| description |
Ferrous iron bio-oxidation is negatively affected by the presence of heavy metals. Although the available information relates this phenomenon to purely biological aspects, it is contradictory with respect to tolerance levels, mechanisms and kinetics. This dispersion of results may be due to the empirical nature of the approaches which are based on batch cultures and fail to consider the conditions of aeration of the biomass. In the present work, the influence of Zn2+ in the range of 0-40 g/L is tested in continuous packed-bed bioreactors, by studying oxygen partial pressure and aeration flow rate as variables. Results show that when oxygen is the limiting reagent under identical aeration conditions, the bio-oxidation rate decreases by 0.8% per gram per litre of Zn2+. The cause of this result is purely thermodynamic; the solubility of oxygen in the medium decreases in equivalent proportions of the bio-oxidation rate owing to the salting-out effect. This finding leads to redesign of reactors for continuous ferrous iron bio-oxidation with the presence of Zn2+, whereby special attention is paid to the aeration system and its control during the operation. |
| publishDate |
2010 |
| dc.date.none.fl_str_mv |
2010 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion |
| format |
article |
| status_str |
acceptedVersion |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/11441/156526 https://doi.org/10.1016/j.bej.2009.12.018 |
| url |
https://hdl.handle.net/11441/156526 https://doi.org/10.1016/j.bej.2009.12.018 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Biochemical Engineering Journal, 49 (2), 235-240. NMP1- CT-500329-1 https://doi.org/10.1016/j.bej.2009.12.018 |
| dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf application/pdf |
| dc.publisher.none.fl_str_mv |
Elsevier |
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Elsevier |
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reponame:idUS. Depósito de Investigación de la Universidad de Sevilla instname:Universidad de Sevilla (US) |
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Universidad de Sevilla (US) |
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idUS. Depósito de Investigación de la Universidad de Sevilla |
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idUS. Depósito de Investigación de la Universidad de Sevilla |
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