Removal of heavy metals from mine tailings by in-situ bioleaching coupled to electrokinetics

This work utilizes a combined biological-electrochemical technique for the in-situ removal of metals from polluted mine tailings. As the main novelty point it is proposed to use electrokinetics (EK) for the in-situ activation of a bioleaching mechanism into the tailings, in order to promote biologic...

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Autores: Acosta Hernández, Irene, Muñoz Morales, Martín, Fernández Morales, Francisco Jesús, Rodríguez Romero, Luis, Villaseñor Camacho, José
Tipo de recurso: artículo
Fecha de publicación:2023
País:España
Institución:Universidad de Castilla-La Mancha
Repositorio:RUIdeRA. Repositorio Institucional de la UCLM
OAI Identifier:oai:ruidera.uclm.es:10578/33016
Acceso en línea:https://doi.org/10.1016/j.envres.2023.117183
https://hdl.handle.net/10578/33016
Access Level:acceso abierto
Palabra clave:Metal polluted soil
Biodissolution
Electrobioremediation
Direct current
Alternate current
Bioaugmentation
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spelling Removal of heavy metals from mine tailings by in-situ bioleaching coupled to electrokineticsAcosta Hernández, IreneMuñoz Morales, MartínFernández Morales, Francisco JesúsRodríguez Romero, LuisVillaseñor Camacho, JoséMetal polluted soilBiodissolutionElectrobioremediationDirect currentAlternate currentBioaugmentationThis work utilizes a combined biological-electrochemical technique for the in-situ removal of metals from polluted mine tailings. As the main novelty point it is proposed to use electrokinetics (EK) for the in-situ activation of a bioleaching mechanism into the tailings, in order to promote biological dissolution of metal sulphides (Step 1), and for the subsequent removal of leached metals by EK transport out of the tailings (Step 2). Mine tailings were collected from an abandoned Pb/Zn mine located in central-southern Spain. EK-bioleaching experiments were performed under batch mode using a lab scale EK cell. A mixed microbial culture of autochthonous acidophilic bacteria grown from the tailings was used. Direct current with polarity reversal vs alternate current was evaluated in Step 1. In turn, different biological strategies were used: biostimulation, bioaugmentation and the abiotic reference test (EK alone). It was observed that bioleaching activation was very low during Step 1, because it was difficult to maintain acidic pH in the whole soil, but then it worked correctly during Step 2. It was confirmed that microorganisms successfully contributed to the in-situ solubilization of the metal sulphides as final metal removal rates were improved compared to the conventional abiotic EK (best increases of around 40% for Cu, 162% for Pb, 18% for Zn, 13% for Mn, 40% for Ni and 15% for Cr). Alternate current seemed to be the best option. The tailings concentrations of Fe, Al, Cu, Mn, Ni and Pb after treatment comply with regulations, but Pb, Cd and Zn concentrations exceed the maximum values. From the data obtained in this work it has been observed that EK-bioleaching could be feasible, but some upgrades and future work must be done in order to optimize experimental conditions, especially the control of soil pH in acidic values.ACADEMIC PRESS INC ELSEVIER SCIENCE202420242023info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttps://doi.org/10.1016/j.envres.2023.117183https://hdl.handle.net/10578/33016reponame:RUIdeRA. Repositorio Institucional de la UCLMinstname:Universidad de Castilla-La ManchaInglésinfo:eu-repo/semantics/openAccessoai:ruidera.uclm.es:10578/330162026-05-27T07:36:41Z
dc.title.none.fl_str_mv Removal of heavy metals from mine tailings by in-situ bioleaching coupled to electrokinetics
title Removal of heavy metals from mine tailings by in-situ bioleaching coupled to electrokinetics
spellingShingle Removal of heavy metals from mine tailings by in-situ bioleaching coupled to electrokinetics
Acosta Hernández, Irene
Metal polluted soil
Biodissolution
Electrobioremediation
Direct current
Alternate current
Bioaugmentation
title_short Removal of heavy metals from mine tailings by in-situ bioleaching coupled to electrokinetics
title_full Removal of heavy metals from mine tailings by in-situ bioleaching coupled to electrokinetics
title_fullStr Removal of heavy metals from mine tailings by in-situ bioleaching coupled to electrokinetics
title_full_unstemmed Removal of heavy metals from mine tailings by in-situ bioleaching coupled to electrokinetics
title_sort Removal of heavy metals from mine tailings by in-situ bioleaching coupled to electrokinetics
dc.creator.none.fl_str_mv Acosta Hernández, Irene
Muñoz Morales, Martín
Fernández Morales, Francisco Jesús
Rodríguez Romero, Luis
Villaseñor Camacho, José
author Acosta Hernández, Irene
author_facet Acosta Hernández, Irene
Muñoz Morales, Martín
Fernández Morales, Francisco Jesús
Rodríguez Romero, Luis
Villaseñor Camacho, José
author_role author
author2 Muñoz Morales, Martín
Fernández Morales, Francisco Jesús
Rodríguez Romero, Luis
Villaseñor Camacho, José
author2_role author
author
author
author
dc.subject.none.fl_str_mv Metal polluted soil
Biodissolution
Electrobioremediation
Direct current
Alternate current
Bioaugmentation
topic Metal polluted soil
Biodissolution
Electrobioremediation
Direct current
Alternate current
Bioaugmentation
description This work utilizes a combined biological-electrochemical technique for the in-situ removal of metals from polluted mine tailings. As the main novelty point it is proposed to use electrokinetics (EK) for the in-situ activation of a bioleaching mechanism into the tailings, in order to promote biological dissolution of metal sulphides (Step 1), and for the subsequent removal of leached metals by EK transport out of the tailings (Step 2). Mine tailings were collected from an abandoned Pb/Zn mine located in central-southern Spain. EK-bioleaching experiments were performed under batch mode using a lab scale EK cell. A mixed microbial culture of autochthonous acidophilic bacteria grown from the tailings was used. Direct current with polarity reversal vs alternate current was evaluated in Step 1. In turn, different biological strategies were used: biostimulation, bioaugmentation and the abiotic reference test (EK alone). It was observed that bioleaching activation was very low during Step 1, because it was difficult to maintain acidic pH in the whole soil, but then it worked correctly during Step 2. It was confirmed that microorganisms successfully contributed to the in-situ solubilization of the metal sulphides as final metal removal rates were improved compared to the conventional abiotic EK (best increases of around 40% for Cu, 162% for Pb, 18% for Zn, 13% for Mn, 40% for Ni and 15% for Cr). Alternate current seemed to be the best option. The tailings concentrations of Fe, Al, Cu, Mn, Ni and Pb after treatment comply with regulations, but Pb, Cd and Zn concentrations exceed the maximum values. From the data obtained in this work it has been observed that EK-bioleaching could be feasible, but some upgrades and future work must be done in order to optimize experimental conditions, especially the control of soil pH in acidic values.
publishDate 2023
dc.date.none.fl_str_mv 2023
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://doi.org/10.1016/j.envres.2023.117183
https://hdl.handle.net/10578/33016
url https://doi.org/10.1016/j.envres.2023.117183
https://hdl.handle.net/10578/33016
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv ACADEMIC PRESS INC ELSEVIER SCIENCE
publisher.none.fl_str_mv ACADEMIC PRESS INC ELSEVIER SCIENCE
dc.source.none.fl_str_mv reponame:RUIdeRA. Repositorio Institucional de la UCLM
instname:Universidad de Castilla-La Mancha
instname_str Universidad de Castilla-La Mancha
reponame_str RUIdeRA. Repositorio Institucional de la UCLM
collection RUIdeRA. Repositorio Institucional de la UCLM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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