Enhanced electrokinetic remediation of polluted soils by anolyte pH conditioning

In the treatment of a polluted soil, the pH has a strong impact on the development of different physicochemical processes as precipitation/dissolution, adsorption/desorption or ionic exchange. In addition, the pH determines the chemical speciation of the compounds present in the system and, conseque...

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Detalhes bibliográficos
Autores: López-Vizcaíno López, Rubén, Yustres Real, Ángel, Asensio Sánchez, Laura, Sáez Jiménez, Cristina, Cañizares Cañizares, Pablo
Tipo de documento: artigo
Data de publicação:2018
País:España
Recursos:Universidad de Castilla-La Mancha
Repositório:RUIdeRA. Repositorio Institucional de la UCLM
OAI Identifier:oai:ruidera.uclm.es:10578/17775
Acesso em linha:http://hdl.handle.net/10578/17775
Access Level:Acceso aberto
Palavra-chave:Electrokinetic soil remediation
Multiphysics simulation
Anolyte pH conditioning
Pesticide
M4EKR
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spelling Enhanced electrokinetic remediation of polluted soils by anolyte pH conditioningLópez-Vizcaíno López, RubénYustres Real, ÁngelAsensio Sánchez, LauraSáez Jiménez, CristinaCañizares Cañizares, PabloElectrokinetic soil remediationMultiphysics simulationAnolyte pH conditioningPesticideM4EKRIn the treatment of a polluted soil, the pH has a strong impact on the development of different physicochemical processes as precipitation/dissolution, adsorption/desorption or ionic exchange. In addition, the pH determines the chemical speciation of the compounds present in the system and, consequently, it conditions the transport processes by which those compounds will move. This question has aroused great interest in the development of pH control technologies coupled to soil remediation processes. In electrokinetic remediation processes, pH has usually been controlled by catholyte pH conditioning with acid solutions, applied to cases of heavy metals pollution. However, this method is not effective with pollutants that can be dissociated in anionic species. In this context, this paper presents a study of the electrokinetic remediation of soils polluted with 2,4-Dichlorophenoxyacetic acid, a common polar pesticide, enhanced with an anolyte pH conditioning strategy. A numerical study is proposed to evaluate the effectiveness of the strategy. Several numerical tests have been carried out for NaOH solutions with different concentrations as pH conditioning fluid. The results show that the anolyte pH conditioning strategy makes it possible to control the pH of the soil and, consequently, the chemical speciation of pollutant species. Thus, it is possible to achieve an important flux of pesticide into the anolyte compartment (electro-migration of anionic species and diffusive transport of acid species). This way, it possible to maximise the pesticide accumulation in this compartment, allowing a much more effective removal of pollutants from the soil than without the anolyte pH conditioning strategy.ELSEVIER201820182018info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttp://hdl.handle.net/10578/17775reponame:RUIdeRA. Repositorio Institucional de la UCLMinstname:Universidad de Castilla-La ManchaInglésinfo:eu-repo/semantics/openAccessoai:ruidera.uclm.es:10578/177752026-05-27T07:36:41Z
dc.title.none.fl_str_mv Enhanced electrokinetic remediation of polluted soils by anolyte pH conditioning
title Enhanced electrokinetic remediation of polluted soils by anolyte pH conditioning
spellingShingle Enhanced electrokinetic remediation of polluted soils by anolyte pH conditioning
López-Vizcaíno López, Rubén
Electrokinetic soil remediation
Multiphysics simulation
Anolyte pH conditioning
Pesticide
M4EKR
title_short Enhanced electrokinetic remediation of polluted soils by anolyte pH conditioning
title_full Enhanced electrokinetic remediation of polluted soils by anolyte pH conditioning
title_fullStr Enhanced electrokinetic remediation of polluted soils by anolyte pH conditioning
title_full_unstemmed Enhanced electrokinetic remediation of polluted soils by anolyte pH conditioning
title_sort Enhanced electrokinetic remediation of polluted soils by anolyte pH conditioning
dc.creator.none.fl_str_mv López-Vizcaíno López, Rubén
Yustres Real, Ángel
Asensio Sánchez, Laura
Sáez Jiménez, Cristina
Cañizares Cañizares, Pablo
author López-Vizcaíno López, Rubén
author_facet López-Vizcaíno López, Rubén
Yustres Real, Ángel
Asensio Sánchez, Laura
Sáez Jiménez, Cristina
Cañizares Cañizares, Pablo
author_role author
author2 Yustres Real, Ángel
Asensio Sánchez, Laura
Sáez Jiménez, Cristina
Cañizares Cañizares, Pablo
author2_role author
author
author
author
dc.subject.none.fl_str_mv Electrokinetic soil remediation
Multiphysics simulation
Anolyte pH conditioning
Pesticide
M4EKR
topic Electrokinetic soil remediation
Multiphysics simulation
Anolyte pH conditioning
Pesticide
M4EKR
description In the treatment of a polluted soil, the pH has a strong impact on the development of different physicochemical processes as precipitation/dissolution, adsorption/desorption or ionic exchange. In addition, the pH determines the chemical speciation of the compounds present in the system and, consequently, it conditions the transport processes by which those compounds will move. This question has aroused great interest in the development of pH control technologies coupled to soil remediation processes. In electrokinetic remediation processes, pH has usually been controlled by catholyte pH conditioning with acid solutions, applied to cases of heavy metals pollution. However, this method is not effective with pollutants that can be dissociated in anionic species. In this context, this paper presents a study of the electrokinetic remediation of soils polluted with 2,4-Dichlorophenoxyacetic acid, a common polar pesticide, enhanced with an anolyte pH conditioning strategy. A numerical study is proposed to evaluate the effectiveness of the strategy. Several numerical tests have been carried out for NaOH solutions with different concentrations as pH conditioning fluid. The results show that the anolyte pH conditioning strategy makes it possible to control the pH of the soil and, consequently, the chemical speciation of pollutant species. Thus, it is possible to achieve an important flux of pesticide into the anolyte compartment (electro-migration of anionic species and diffusive transport of acid species). This way, it possible to maximise the pesticide accumulation in this compartment, allowing a much more effective removal of pollutants from the soil than without the anolyte pH conditioning strategy.
publishDate 2018
dc.date.none.fl_str_mv 2018
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10578/17775
url http://hdl.handle.net/10578/17775
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 ELSEVIER
publisher.none.fl_str_mv ELSEVIER
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 15,300724

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