Reversibility of al-kaolin and al-humic aggregates monitored by stable diameter and size distribution
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | |
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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Repositório Institucional da UNESP |
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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 |
|
_version_ |
1808128231783530496 |