Rhamnolipid-enhanced solubilization and biodegradation of PAHs in soils after conventional bioremediation

The application of a rhamnolipid biosurfactant for enhanced solubilization and biodegradation of slowly desorbing polycyclic aromatic hydrocarbons (PAHs) in contaminated soils was determined in this study. The soil samples exhibited different levels of pollution and different bioremediation stages:...

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Detalles Bibliográficos
Autores: Posada-Baquero, Rosa, Grifoll Ruiz, Magdalena, Ortega-Calvo, José-Julio
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2019
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/207491
Acceso en línea:https://hdl.handle.net/2445/207491
Access Level:acceso abierto
Palabra clave:Biodegradació
Bioremediació
Biodegradation
Bioremediation
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spelling Rhamnolipid-enhanced solubilization and biodegradation of PAHs in soils after conventional bioremediationPosada-Baquero, RosaGrifoll Ruiz, MagdalenaOrtega-Calvo, José-JulioBiodegradacióBioremediacióBiodegradationBioremediationThe application of a rhamnolipid biosurfactant for enhanced solubilization and biodegradation of slowly desorbing polycyclic aromatic hydrocarbons (PAHs) in contaminated soils was determined in this study. The soil samples exhibited different levels of pollution and different bioremediation stages: the first soil originated from a creosote-polluted site, contained 4370 mg kg -1 of PAHs and had not been bioremediated; the second soil was the same as the first but had received bioremediation treatment with nutrient amendment in biopiles for a period of 5 months and contained 580 mg kg -1 of PAHs after this treatment; the third soil was treated by bioremediation for several years to reduce the concentration of PAHs to 275 mg kg -1. The kinetics of PAH desorption were determined to assess the magnitude of the slowly desorbing fractions present in the polluted soil and to optimize the biosurfactant effectiveness in terms of biodegradation. The soils that had been treated by bioremediation were enriched in slowly desorbing PAHs. The rhamnolipid at a concentration above its critical micelle concentration enhanced biodegradation in the soils that had been bioremediated previously. The measurement of residual concentrations of native PAHs showed the promoting effect of the biosurfactant on the biodegradation of the slowly desorbing fractions. Interestingly, benzo(a)pyrene was biodegraded in the soil that had been bioremediated for a long time. Rhamnolipid can constitute a valid alternative to chemical surfactants in promoting the biodegradation of slow-desorption PAHs, which is one of the most important problems in bioremediation, but the efficiency depends strongly on the bioremediation stage in which the biosurfactant is applied.Elsevier B.V.2019info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/207491Articles publicats en revistes (Genètica, Microbiologia i Estadística)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.1016/j.scitotenv.2019.03.056Science of the Total Environment, 2019, vol. 668, p. 790-796https://doi.org/10.1016/j.scitotenv.2019.03.056cc-by-nc-nd (c) Elsevier B.V., 2019http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/2074912026-05-27T06:46:51Z
dc.title.none.fl_str_mv Rhamnolipid-enhanced solubilization and biodegradation of PAHs in soils after conventional bioremediation
title Rhamnolipid-enhanced solubilization and biodegradation of PAHs in soils after conventional bioremediation
spellingShingle Rhamnolipid-enhanced solubilization and biodegradation of PAHs in soils after conventional bioremediation
Posada-Baquero, Rosa
Biodegradació
Bioremediació
Biodegradation
Bioremediation
title_short Rhamnolipid-enhanced solubilization and biodegradation of PAHs in soils after conventional bioremediation
title_full Rhamnolipid-enhanced solubilization and biodegradation of PAHs in soils after conventional bioremediation
title_fullStr Rhamnolipid-enhanced solubilization and biodegradation of PAHs in soils after conventional bioremediation
title_full_unstemmed Rhamnolipid-enhanced solubilization and biodegradation of PAHs in soils after conventional bioremediation
title_sort Rhamnolipid-enhanced solubilization and biodegradation of PAHs in soils after conventional bioremediation
dc.creator.none.fl_str_mv Posada-Baquero, Rosa
Grifoll Ruiz, Magdalena
Ortega-Calvo, José-Julio
author Posada-Baquero, Rosa
author_facet Posada-Baquero, Rosa
Grifoll Ruiz, Magdalena
Ortega-Calvo, José-Julio
author_role author
author2 Grifoll Ruiz, Magdalena
Ortega-Calvo, José-Julio
author2_role author
author
dc.subject.none.fl_str_mv Biodegradació
Bioremediació
Biodegradation
Bioremediation
topic Biodegradació
Bioremediació
Biodegradation
Bioremediation
description The application of a rhamnolipid biosurfactant for enhanced solubilization and biodegradation of slowly desorbing polycyclic aromatic hydrocarbons (PAHs) in contaminated soils was determined in this study. The soil samples exhibited different levels of pollution and different bioremediation stages: the first soil originated from a creosote-polluted site, contained 4370 mg kg -1 of PAHs and had not been bioremediated; the second soil was the same as the first but had received bioremediation treatment with nutrient amendment in biopiles for a period of 5 months and contained 580 mg kg -1 of PAHs after this treatment; the third soil was treated by bioremediation for several years to reduce the concentration of PAHs to 275 mg kg -1. The kinetics of PAH desorption were determined to assess the magnitude of the slowly desorbing fractions present in the polluted soil and to optimize the biosurfactant effectiveness in terms of biodegradation. The soils that had been treated by bioremediation were enriched in slowly desorbing PAHs. The rhamnolipid at a concentration above its critical micelle concentration enhanced biodegradation in the soils that had been bioremediated previously. The measurement of residual concentrations of native PAHs showed the promoting effect of the biosurfactant on the biodegradation of the slowly desorbing fractions. Interestingly, benzo(a)pyrene was biodegraded in the soil that had been bioremediated for a long time. Rhamnolipid can constitute a valid alternative to chemical surfactants in promoting the biodegradation of slow-desorption PAHs, which is one of the most important problems in bioremediation, but the efficiency depends strongly on the bioremediation stage in which the biosurfactant is applied.
publishDate 2019
dc.date.none.fl_str_mv 2019
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/2445/207491
url https://hdl.handle.net/2445/207491
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.scitotenv.2019.03.056
Science of the Total Environment, 2019, vol. 668, p. 790-796
https://doi.org/10.1016/j.scitotenv.2019.03.056
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Elsevier B.V., 2019
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd (c) Elsevier B.V., 2019
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Articles publicats en revistes (Genètica, Microbiologia i Estadística)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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