Reversibility of al-kaolin and al-humic aggregates monitored by stable diameter and size distribution

Detalhes bibliográficos
Autor(a) principal: Moruzzi, Rodrigo Braga [UNESP]
Data de Publicação: 2018
Outros Autores: da Silva, Pedro Augusto Grava [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/0104-6632.20180353s20170098
http://hdl.handle.net/11449/190092
Resumo: The reversibility of aggregates during flocculation was investigated. The stable diameter (d) and the power law slope coefficient of the particle size distribution (β) were applied to follow re-formation after breakage. A non-intrusive image-based technique was used for monitoring flocs. Aggregates were formed by adding alum [Al 2 (SO 4 ) 3 ·18H 2 O] by the sweep-coagulation mechanism to two synthetic waters, prepared from kaolin (Fluka) and humic acid (Aldrich Chemical). Velocity gradients (G) varied from 20 to 120 s -1 during experiments, and the rupture occurred under controlled conditions. After rupture, the initial condition was reinstated and reversibility analyzed. Results pointed out the irreversibility of breakage for both Al-kaolin and Al-humic flocs. The stable diameter of aggregates after breakage (d 2 ) varied from 157 to 132 µm for Al-humic and from 233 to 123µm for Al-kaolin aggregates, using G from 20 to 120 s -1 . β 2 values varied from 1.2 to 4.6 for Al-humic and from 0.6 to 7.7 for Al-kaolin.
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spelling Reversibility of al-kaolin and al-humic aggregates monitored by stable diameter and size distributionBreakageFlocculationImage analysisThe reversibility of aggregates during flocculation was investigated. The stable diameter (d) and the power law slope coefficient of the particle size distribution (β) were applied to follow re-formation after breakage. A non-intrusive image-based technique was used for monitoring flocs. Aggregates were formed by adding alum [Al 2 (SO 4 ) 3 ·18H 2 O] by the sweep-coagulation mechanism to two synthetic waters, prepared from kaolin (Fluka) and humic acid (Aldrich Chemical). Velocity gradients (G) varied from 20 to 120 s -1 during experiments, and the rupture occurred under controlled conditions. After rupture, the initial condition was reinstated and reversibility analyzed. Results pointed out the irreversibility of breakage for both Al-kaolin and Al-humic flocs. The stable diameter of aggregates after breakage (d 2 ) varied from 157 to 132 µm for Al-humic and from 233 to 123µm for Al-kaolin aggregates, using G from 20 to 120 s -1 . β 2 values varied from 1.2 to 4.6 for Al-humic and from 0.6 to 7.7 for Al-kaolin.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Universidade Estadual Paulista (Unesp) Instituto de Geociências e Ciências Exatas, Avenida 24-A, nº1515, C. P. 178Universidade Estadual Paulista (Unesp) Instituto de Geociências e Ciências Exatas, Avenida 24-A, nº1515, C. P. 178FAPESP: 2013/25641-9Universidade Estadual Paulista (Unesp)Moruzzi, Rodrigo Braga [UNESP]da Silva, Pedro Augusto Grava [UNESP]2019-10-06T17:02:00Z2019-10-06T17:02:00Z2018-07-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1029-1038application/pdfhttp://dx.doi.org/10.1590/0104-6632.20180353s20170098Brazilian Journal of Chemical Engineering, v. 35, n. 3, p. 1029-1038, 2018.0104-6632http://hdl.handle.net/11449/19009210.1590/0104-6632.20180353s20170098S0104-663220180003010292-s2.0-85061121777S0104-66322018000301029.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBrazilian Journal of Chemical Engineeringinfo:eu-repo/semantics/openAccess2023-12-11T06:12:36Zoai:repositorio.unesp.br:11449/190092Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:00:15.955315Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Reversibility of al-kaolin and al-humic aggregates monitored by stable diameter and size distribution
title Reversibility of al-kaolin and al-humic aggregates monitored by stable diameter and size distribution
spellingShingle Reversibility of al-kaolin and al-humic aggregates monitored by stable diameter and size distribution
Moruzzi, Rodrigo Braga [UNESP]
Breakage
Flocculation
Image analysis
title_short Reversibility of al-kaolin and al-humic aggregates monitored by stable diameter and size distribution
title_full Reversibility of al-kaolin and al-humic aggregates monitored by stable diameter and size distribution
title_fullStr Reversibility of al-kaolin and al-humic aggregates monitored by stable diameter and size distribution
title_full_unstemmed Reversibility of al-kaolin and al-humic aggregates monitored by stable diameter and size distribution
title_sort Reversibility of al-kaolin and al-humic aggregates monitored by stable diameter and size distribution
author Moruzzi, Rodrigo Braga [UNESP]
author_facet Moruzzi, Rodrigo Braga [UNESP]
da Silva, Pedro Augusto Grava [UNESP]
author_role author
author2 da Silva, Pedro Augusto Grava [UNESP]
author2_role author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Moruzzi, Rodrigo Braga [UNESP]
da Silva, Pedro Augusto Grava [UNESP]
dc.subject.por.fl_str_mv Breakage
Flocculation
Image analysis
topic Breakage
Flocculation
Image analysis
description The reversibility of aggregates during flocculation was investigated. The stable diameter (d) and the power law slope coefficient of the particle size distribution (β) were applied to follow re-formation after breakage. A non-intrusive image-based technique was used for monitoring flocs. Aggregates were formed by adding alum [Al 2 (SO 4 ) 3 ·18H 2 O] by the sweep-coagulation mechanism to two synthetic waters, prepared from kaolin (Fluka) and humic acid (Aldrich Chemical). Velocity gradients (G) varied from 20 to 120 s -1 during experiments, and the rupture occurred under controlled conditions. After rupture, the initial condition was reinstated and reversibility analyzed. Results pointed out the irreversibility of breakage for both Al-kaolin and Al-humic flocs. The stable diameter of aggregates after breakage (d 2 ) varied from 157 to 132 µm for Al-humic and from 233 to 123µm for Al-kaolin aggregates, using G from 20 to 120 s -1 . β 2 values varied from 1.2 to 4.6 for Al-humic and from 0.6 to 7.7 for Al-kaolin.
publishDate 2018
dc.date.none.fl_str_mv 2018-07-01
2019-10-06T17:02:00Z
2019-10-06T17:02:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1590/0104-6632.20180353s20170098
Brazilian Journal of Chemical Engineering, v. 35, n. 3, p. 1029-1038, 2018.
0104-6632
http://hdl.handle.net/11449/190092
10.1590/0104-6632.20180353s20170098
S0104-66322018000301029
2-s2.0-85061121777
S0104-66322018000301029.pdf
url http://dx.doi.org/10.1590/0104-6632.20180353s20170098
http://hdl.handle.net/11449/190092
identifier_str_mv Brazilian Journal of Chemical Engineering, v. 35, n. 3, p. 1029-1038, 2018.
0104-6632
10.1590/0104-6632.20180353s20170098
S0104-66322018000301029
2-s2.0-85061121777
S0104-66322018000301029.pdf
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Brazilian Journal of Chemical Engineering
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 1029-1038
application/pdf
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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