Kraft pulp mill dregs and grits as permeable reactive barrier for removal of copper and sulfate in acid mine drainage

Detalhes bibliográficos
Autor(a) principal: Farage, Rogério M P
Data de Publicação: 2020
Outros Autores: Quina, Margarida J., Gando-Ferreira, Licínio M., Silva, Cláudio M., de Souza, José João L. L., Torres, Caio M. M. E.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/106709
https://doi.org/10.1038/s41598-020-60780-2
Resumo: Mining is an essential human activity, but results in several environmental impacts, notably the contamination of ground and surface water through the presence of toxic substances such as metals and sulfates in mine drainage. Permeable reactive barriers (PRB) have been applied to remediate this environmental impact, but the high costs associated with the maintenance of this system are still a challenge. The main objective of this study was to evaluate the use of kraft pulp mill alkaline residues, known as dregs and grits, as material for PRB, and to determine their capacity for retaining copper and sulfate. The work was carried out in laboratory adsorption kinetics assays, batch assays and column tests. Tests for elemental characterization, point of zero charge, acid neutralization capacity, total porosity, bulk density and moisture of the dregs and grits were conducted. The results showed high retention of Cu due to a chemical precipitation mechanism, notably for dregs (99%) at 5 min in adsorption kinetics. The grits presented similar results after 180 min for the same assay. Sulfate retention was effective at pH below 5, with an efficiency of 79% and 89% for dregs and grits, respectively. Dregs presented the best results for acid drainage remediation, notably with a solid:liquid (S:L) ratio of 1:10.
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spelling Kraft pulp mill dregs and grits as permeable reactive barrier for removal of copper and sulfate in acid mine drainageMining is an essential human activity, but results in several environmental impacts, notably the contamination of ground and surface water through the presence of toxic substances such as metals and sulfates in mine drainage. Permeable reactive barriers (PRB) have been applied to remediate this environmental impact, but the high costs associated with the maintenance of this system are still a challenge. The main objective of this study was to evaluate the use of kraft pulp mill alkaline residues, known as dregs and grits, as material for PRB, and to determine their capacity for retaining copper and sulfate. The work was carried out in laboratory adsorption kinetics assays, batch assays and column tests. Tests for elemental characterization, point of zero charge, acid neutralization capacity, total porosity, bulk density and moisture of the dregs and grits were conducted. The results showed high retention of Cu due to a chemical precipitation mechanism, notably for dregs (99%) at 5 min in adsorption kinetics. The grits presented similar results after 180 min for the same assay. Sulfate retention was effective at pH below 5, with an efficiency of 79% and 89% for dregs and grits, respectively. Dregs presented the best results for acid drainage remediation, notably with a solid:liquid (S:L) ratio of 1:10.Springer Nature2020-03-05info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/106709http://hdl.handle.net/10316/106709https://doi.org/10.1038/s41598-020-60780-2eng2045-2322Farage, Rogério M PQuina, Margarida J.Gando-Ferreira, Licínio M.Silva, Cláudio M.de Souza, José João L. L.Torres, Caio M. M. E.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-04-18T09:03:36Zoai:estudogeral.uc.pt:10316/106709Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:23:07.504441Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Kraft pulp mill dregs and grits as permeable reactive barrier for removal of copper and sulfate in acid mine drainage
title Kraft pulp mill dregs and grits as permeable reactive barrier for removal of copper and sulfate in acid mine drainage
spellingShingle Kraft pulp mill dregs and grits as permeable reactive barrier for removal of copper and sulfate in acid mine drainage
Farage, Rogério M P
title_short Kraft pulp mill dregs and grits as permeable reactive barrier for removal of copper and sulfate in acid mine drainage
title_full Kraft pulp mill dregs and grits as permeable reactive barrier for removal of copper and sulfate in acid mine drainage
title_fullStr Kraft pulp mill dregs and grits as permeable reactive barrier for removal of copper and sulfate in acid mine drainage
title_full_unstemmed Kraft pulp mill dregs and grits as permeable reactive barrier for removal of copper and sulfate in acid mine drainage
title_sort Kraft pulp mill dregs and grits as permeable reactive barrier for removal of copper and sulfate in acid mine drainage
author Farage, Rogério M P
author_facet Farage, Rogério M P
Quina, Margarida J.
Gando-Ferreira, Licínio M.
Silva, Cláudio M.
de Souza, José João L. L.
Torres, Caio M. M. E.
author_role author
author2 Quina, Margarida J.
Gando-Ferreira, Licínio M.
Silva, Cláudio M.
de Souza, José João L. L.
Torres, Caio M. M. E.
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Farage, Rogério M P
Quina, Margarida J.
Gando-Ferreira, Licínio M.
Silva, Cláudio M.
de Souza, José João L. L.
Torres, Caio M. M. E.
description Mining is an essential human activity, but results in several environmental impacts, notably the contamination of ground and surface water through the presence of toxic substances such as metals and sulfates in mine drainage. Permeable reactive barriers (PRB) have been applied to remediate this environmental impact, but the high costs associated with the maintenance of this system are still a challenge. The main objective of this study was to evaluate the use of kraft pulp mill alkaline residues, known as dregs and grits, as material for PRB, and to determine their capacity for retaining copper and sulfate. The work was carried out in laboratory adsorption kinetics assays, batch assays and column tests. Tests for elemental characterization, point of zero charge, acid neutralization capacity, total porosity, bulk density and moisture of the dregs and grits were conducted. The results showed high retention of Cu due to a chemical precipitation mechanism, notably for dregs (99%) at 5 min in adsorption kinetics. The grits presented similar results after 180 min for the same assay. Sulfate retention was effective at pH below 5, with an efficiency of 79% and 89% for dregs and grits, respectively. Dregs presented the best results for acid drainage remediation, notably with a solid:liquid (S:L) ratio of 1:10.
publishDate 2020
dc.date.none.fl_str_mv 2020-03-05
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10316/106709
http://hdl.handle.net/10316/106709
https://doi.org/10.1038/s41598-020-60780-2
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https://doi.org/10.1038/s41598-020-60780-2
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