Organic matter removal from oil-water emulsions by electrocoagulation - 1: thermodynamic analysis
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | REM. Revista Escola de Minas (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0370-44672013000100010 |
Resumo: | A thermodynamic analysis of the organic matter (chemical oxygen demand - COD) removal from synthetic oil-water emulsions by the electrocoagulation process was performed with the objective of determining the most stable ionic species under diverse pH and aluminum concentration conditions and identifying possible removal mechanisms. The analysis suggests that the predominant species during the reactive stage are the amorphous aluminum hydroxide (for the mononuclear speciation of aluminum) and the positively charged trimeric species, Al3(OH)45+ (for the polynuclear speciation of aluminum). The emulsion destabilization probably occurs by charge neutralization, carried out jointly by the polynuclear species and by positively charged aluminum hydroxide. This sorption mechanism is likely to be the primary coagulation mechanism during the reactive stage. The formation of aluminum hydroxide and/or oxide during the stabilization stage may also take place, which indicates the gradual change of the dominant removal mechanism to sweep flocculation. |
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Organic matter removal from oil-water emulsions by electrocoagulation - 1: thermodynamic analysisElectrocoagulationoil-water emulsionsorganic matter (COD)thermodynamicsA thermodynamic analysis of the organic matter (chemical oxygen demand - COD) removal from synthetic oil-water emulsions by the electrocoagulation process was performed with the objective of determining the most stable ionic species under diverse pH and aluminum concentration conditions and identifying possible removal mechanisms. The analysis suggests that the predominant species during the reactive stage are the amorphous aluminum hydroxide (for the mononuclear speciation of aluminum) and the positively charged trimeric species, Al3(OH)45+ (for the polynuclear speciation of aluminum). The emulsion destabilization probably occurs by charge neutralization, carried out jointly by the polynuclear species and by positively charged aluminum hydroxide. This sorption mechanism is likely to be the primary coagulation mechanism during the reactive stage. The formation of aluminum hydroxide and/or oxide during the stabilization stage may also take place, which indicates the gradual change of the dominant removal mechanism to sweep flocculation.Escola de Minas2013-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0370-44672013000100010Rem: Revista Escola de Minas v.66 n.1 2013reponame:REM. Revista Escola de Minas (Online)instname:Escola de Minasinstacron:ESCOLA DE MINAS10.1590/S0370-44672013000100010info:eu-repo/semantics/openAccessRangel,Rodolfo MaiaCarvalho,Roberto José deTorem,Maurício Leonardoeng2013-04-03T00:00:00Zoai:scielo:S0370-44672013000100010Revistahttp://www.scielo.br/remhttps://old.scielo.br/oai/scielo-oai.phpeditor@rem.com.br1807-03530370-4467opendoar:2013-04-03T00:00REM. Revista Escola de Minas (Online) - Escola de Minasfalse |
dc.title.none.fl_str_mv |
Organic matter removal from oil-water emulsions by electrocoagulation - 1: thermodynamic analysis |
title |
Organic matter removal from oil-water emulsions by electrocoagulation - 1: thermodynamic analysis |
spellingShingle |
Organic matter removal from oil-water emulsions by electrocoagulation - 1: thermodynamic analysis Rangel,Rodolfo Maia Electrocoagulation oil-water emulsions organic matter (COD) thermodynamics |
title_short |
Organic matter removal from oil-water emulsions by electrocoagulation - 1: thermodynamic analysis |
title_full |
Organic matter removal from oil-water emulsions by electrocoagulation - 1: thermodynamic analysis |
title_fullStr |
Organic matter removal from oil-water emulsions by electrocoagulation - 1: thermodynamic analysis |
title_full_unstemmed |
Organic matter removal from oil-water emulsions by electrocoagulation - 1: thermodynamic analysis |
title_sort |
Organic matter removal from oil-water emulsions by electrocoagulation - 1: thermodynamic analysis |
author |
Rangel,Rodolfo Maia |
author_facet |
Rangel,Rodolfo Maia Carvalho,Roberto José de Torem,Maurício Leonardo |
author_role |
author |
author2 |
Carvalho,Roberto José de Torem,Maurício Leonardo |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Rangel,Rodolfo Maia Carvalho,Roberto José de Torem,Maurício Leonardo |
dc.subject.por.fl_str_mv |
Electrocoagulation oil-water emulsions organic matter (COD) thermodynamics |
topic |
Electrocoagulation oil-water emulsions organic matter (COD) thermodynamics |
description |
A thermodynamic analysis of the organic matter (chemical oxygen demand - COD) removal from synthetic oil-water emulsions by the electrocoagulation process was performed with the objective of determining the most stable ionic species under diverse pH and aluminum concentration conditions and identifying possible removal mechanisms. The analysis suggests that the predominant species during the reactive stage are the amorphous aluminum hydroxide (for the mononuclear speciation of aluminum) and the positively charged trimeric species, Al3(OH)45+ (for the polynuclear speciation of aluminum). The emulsion destabilization probably occurs by charge neutralization, carried out jointly by the polynuclear species and by positively charged aluminum hydroxide. This sorption mechanism is likely to be the primary coagulation mechanism during the reactive stage. The formation of aluminum hydroxide and/or oxide during the stabilization stage may also take place, which indicates the gradual change of the dominant removal mechanism to sweep flocculation. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-03-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0370-44672013000100010 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0370-44672013000100010 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0370-44672013000100010 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Escola de Minas |
publisher.none.fl_str_mv |
Escola de Minas |
dc.source.none.fl_str_mv |
Rem: Revista Escola de Minas v.66 n.1 2013 reponame:REM. Revista Escola de Minas (Online) instname:Escola de Minas instacron:ESCOLA DE MINAS |
instname_str |
Escola de Minas |
instacron_str |
ESCOLA DE MINAS |
institution |
ESCOLA DE MINAS |
reponame_str |
REM. Revista Escola de Minas (Online) |
collection |
REM. Revista Escola de Minas (Online) |
repository.name.fl_str_mv |
REM. Revista Escola de Minas (Online) - Escola de Minas |
repository.mail.fl_str_mv |
editor@rem.com.br |
_version_ |
1754122198586490880 |