Generalised mathematical model to estimate Zn, Pb, Cd, Ni, Cu, Cr and As release from contaminated estuarine sediment using pH-static leaching tests

Variations in the environmental conditions in marine and estuarine environments can lead to the release of elements from the sediment to the seawater phase. The pH dependence leaching test with continuous pH-control evaluates the release of constituents as a function of the pH. In this work, analysi...

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Autores: Martín Torre, María del Camino, Ruiz Gutiérrez, Gema, Galán Corta, Berta|||0000-0003-2145-3669, Viguri Fuente, Javier Rufino|||0000-0002-6658-0429
Tipo de recurso: artículo
Fecha de publicación:2015
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/9658
Acceso en línea:http://hdl.handle.net/10902/9658
Access Level:acceso abierto
Palabra clave:Pollutant release
Modelling
PH-static leaching
Sediment
Acidification
Reactions in series
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spelling Generalised mathematical model to estimate Zn, Pb, Cd, Ni, Cu, Cr and As release from contaminated estuarine sediment using pH-static leaching testsMartín Torre, María del CaminoRuiz Gutiérrez, GemaGalán Corta, Berta|||0000-0003-2145-3669Viguri Fuente, Javier Rufino|||0000-0002-6658-0429Pollutant releaseModellingPH-static leachingSedimentAcidificationReactions in seriesVariations in the environmental conditions in marine and estuarine environments can lead to the release of elements from the sediment to the seawater phase. The pH dependence leaching test with continuous pH-control evaluates the release of constituents as a function of the pH. In this work, analysis of the Zn, Pb, Cd, Ni, Cu, Cr and As release from marine sediment of the Suances estuary (northern Spain) is performed using a leaching test with continuous pH control at pH values of 4, 5, 5.5, 6, 6.5 and 7 with seawater as the leaching liquid. These pollutants present different experimental leaching patterns over time but not all of them are well fitted by the previous models. Hence, a generalised model of the different time-dependent releases under these conditions is proposed. The model considers three reactions in series: (i) the oxidation reaction of the reduced fraction to consider the speciation change over time, (ii) the metal release of the oxidised fraction to the bulk dissolution and (iii) the adsorption or precipitation after the element release. The maximum concentration of each pollutant that could be released from the reduced fraction and from the oxidised fraction and the rate coefficients are the parameters of the proposed model. The rate coefficients of the reactions for each pollutant fit well to a second order equation as a function of pH. Using the Aspen Custom Modeler software, the model parameters have been estimated. A good agreement between the experimental and modelled concentration values is obtained. In addition to improving upon the previous results from models with reactions in parallel, the proposed model predicts the metal mobility delay at short times for Zn, Pb, Cd and Cu and the adsorption or precipitation process after an initial rapid release (As and Cr) reasonably well. The model provides good results when applied to two sediments with different levels of oxidation. The obtained model parameters would be useful when predicting the release of the studied elements for cases in which polluted sediment is totally mixed with inorganic acid-acidified seawater under continuous pH control semibatch leaching tests.This work was supported by the financial help of the Spanish Ministry of Economy and Competitiveness, Project CTM 2011-28437-C02-01, ERDF included. M. C. Martín-Torre was funded by the Spanish Ministry of Science and Innovation by means of an F.P.I. fellowship No. BES-2012-053816.Elsevier LtdUniversidad de Cantabria20152015-12-22journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articlehttp://hdl.handle.net/10902/9658Chemical Engineering Science, 2015, Vol. 138, 780-790reponame:UCrea Repositorio Abierto de la Universidad de Cantabriainstname:Universidad de Cantabria (UC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:repositorio.unican.es:10902/96582026-06-02T12:39:31Z
dc.title.none.fl_str_mv Generalised mathematical model to estimate Zn, Pb, Cd, Ni, Cu, Cr and As release from contaminated estuarine sediment using pH-static leaching tests
title Generalised mathematical model to estimate Zn, Pb, Cd, Ni, Cu, Cr and As release from contaminated estuarine sediment using pH-static leaching tests
spellingShingle Generalised mathematical model to estimate Zn, Pb, Cd, Ni, Cu, Cr and As release from contaminated estuarine sediment using pH-static leaching tests
Martín Torre, María del Camino
Pollutant release
Modelling
PH-static leaching
Sediment
Acidification
Reactions in series
title_short Generalised mathematical model to estimate Zn, Pb, Cd, Ni, Cu, Cr and As release from contaminated estuarine sediment using pH-static leaching tests
title_full Generalised mathematical model to estimate Zn, Pb, Cd, Ni, Cu, Cr and As release from contaminated estuarine sediment using pH-static leaching tests
title_fullStr Generalised mathematical model to estimate Zn, Pb, Cd, Ni, Cu, Cr and As release from contaminated estuarine sediment using pH-static leaching tests
title_full_unstemmed Generalised mathematical model to estimate Zn, Pb, Cd, Ni, Cu, Cr and As release from contaminated estuarine sediment using pH-static leaching tests
title_sort Generalised mathematical model to estimate Zn, Pb, Cd, Ni, Cu, Cr and As release from contaminated estuarine sediment using pH-static leaching tests
dc.creator.none.fl_str_mv Martín Torre, María del Camino
Ruiz Gutiérrez, Gema
Galán Corta, Berta|||0000-0003-2145-3669
Viguri Fuente, Javier Rufino|||0000-0002-6658-0429
author Martín Torre, María del Camino
author_facet Martín Torre, María del Camino
Ruiz Gutiérrez, Gema
Galán Corta, Berta|||0000-0003-2145-3669
Viguri Fuente, Javier Rufino|||0000-0002-6658-0429
author_role author
author2 Ruiz Gutiérrez, Gema
Galán Corta, Berta|||0000-0003-2145-3669
Viguri Fuente, Javier Rufino|||0000-0002-6658-0429
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad de Cantabria
dc.subject.none.fl_str_mv Pollutant release
Modelling
PH-static leaching
Sediment
Acidification
Reactions in series
topic Pollutant release
Modelling
PH-static leaching
Sediment
Acidification
Reactions in series
description Variations in the environmental conditions in marine and estuarine environments can lead to the release of elements from the sediment to the seawater phase. The pH dependence leaching test with continuous pH-control evaluates the release of constituents as a function of the pH. In this work, analysis of the Zn, Pb, Cd, Ni, Cu, Cr and As release from marine sediment of the Suances estuary (northern Spain) is performed using a leaching test with continuous pH control at pH values of 4, 5, 5.5, 6, 6.5 and 7 with seawater as the leaching liquid. These pollutants present different experimental leaching patterns over time but not all of them are well fitted by the previous models. Hence, a generalised model of the different time-dependent releases under these conditions is proposed. The model considers three reactions in series: (i) the oxidation reaction of the reduced fraction to consider the speciation change over time, (ii) the metal release of the oxidised fraction to the bulk dissolution and (iii) the adsorption or precipitation after the element release. The maximum concentration of each pollutant that could be released from the reduced fraction and from the oxidised fraction and the rate coefficients are the parameters of the proposed model. The rate coefficients of the reactions for each pollutant fit well to a second order equation as a function of pH. Using the Aspen Custom Modeler software, the model parameters have been estimated. A good agreement between the experimental and modelled concentration values is obtained. In addition to improving upon the previous results from models with reactions in parallel, the proposed model predicts the metal mobility delay at short times for Zn, Pb, Cd and Cu and the adsorption or precipitation process after an initial rapid release (As and Cr) reasonably well. The model provides good results when applied to two sediments with different levels of oxidation. The obtained model parameters would be useful when predicting the release of the studied elements for cases in which polluted sediment is totally mixed with inorganic acid-acidified seawater under continuous pH control semibatch leaching tests.
publishDate 2015
dc.date.none.fl_str_mv 2015
2015-12-22
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10902/9658
url http://hdl.handle.net/10902/9658
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier Ltd
publisher.none.fl_str_mv Elsevier Ltd
dc.source.none.fl_str_mv Chemical Engineering Science, 2015, Vol. 138, 780-790
reponame:UCrea Repositorio Abierto de la Universidad de Cantabria
instname:Universidad de Cantabria (UC)
instname_str Universidad de Cantabria (UC)
reponame_str UCrea Repositorio Abierto de la Universidad de Cantabria
collection UCrea Repositorio Abierto de la Universidad de Cantabria
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300719

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