Strength assessment of Al-Humic and Al-Kaolin aggregates by intrusive and non-intrusive methods
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.seppur.2019.02.033 http://hdl.handle.net/11449/187375 |
Resumo: | Resistance to breakage is a critical property of aggregates generated in water and wastewater treatment processes. After flocculation, aggregates should ideally keep their physical characteristics (i.e. size and morphology), to result in the best performance possible by individual separation processes. The integrity of aggregates after flocculation depends upon their capacity to resist shear forces while transported through canals, passages, apertures, orifices and other hydraulic units. In this study, the strength of Al-Humic and Al-Kaolin aggregates was investigated using two macroscopic measurement techniques, based on both intrusive and non-intrusive methods, using image analysis and light scattering based equipment. Each technique generates different information which was used for obtaining three floc strength indicators, namely, strength factor (SF), local stress from the hydrodynamic disturbance (σ) and the force coefficient (γ) for two different study waters. The results showed an increasing trend for the SF of both Al-Humic and Al-Kaolin aggregates, ranging from 29.7% to 78.6% and from 33.3% to 85.2%, respectively, in response to the increase of applied shear forces during flocculation (from 20 to 120 s−1). This indicates that aggregates formed at higher shear rates are more resistant to breakage than those formed at lower rates. In these conditions, σ values were observed to range from 0.07 to 0.44 N/m2 and from 0.08 to 0.47 N/m2 for Al-Humic and Al-Kaolin, respectively. Additionally, it was found that for all studied conditions, the resistance of aggregates to shear forces was nearly the same for Al-Humic and Al-Kaolin aggregates, formed from destabilized particles using sweep coagulation. These results suggest that aggregate strength may be mainly controlled by the coagulant, emphasizing the importance of the coagulant selection in water treatment. In addition, the use of both intrusive and non-intrusive techniques helped to confirm and expand previous experiments recently reported in literature. |
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Strength assessment of Al-Humic and Al-Kaolin aggregates by intrusive and non-intrusive methodsAggregatesFloc resistanceFlocculationImage analysisResistance to breakage is a critical property of aggregates generated in water and wastewater treatment processes. After flocculation, aggregates should ideally keep their physical characteristics (i.e. size and morphology), to result in the best performance possible by individual separation processes. The integrity of aggregates after flocculation depends upon their capacity to resist shear forces while transported through canals, passages, apertures, orifices and other hydraulic units. In this study, the strength of Al-Humic and Al-Kaolin aggregates was investigated using two macroscopic measurement techniques, based on both intrusive and non-intrusive methods, using image analysis and light scattering based equipment. Each technique generates different information which was used for obtaining three floc strength indicators, namely, strength factor (SF), local stress from the hydrodynamic disturbance (σ) and the force coefficient (γ) for two different study waters. The results showed an increasing trend for the SF of both Al-Humic and Al-Kaolin aggregates, ranging from 29.7% to 78.6% and from 33.3% to 85.2%, respectively, in response to the increase of applied shear forces during flocculation (from 20 to 120 s−1). This indicates that aggregates formed at higher shear rates are more resistant to breakage than those formed at lower rates. In these conditions, σ values were observed to range from 0.07 to 0.44 N/m2 and from 0.08 to 0.47 N/m2 for Al-Humic and Al-Kaolin, respectively. Additionally, it was found that for all studied conditions, the resistance of aggregates to shear forces was nearly the same for Al-Humic and Al-Kaolin aggregates, formed from destabilized particles using sweep coagulation. These results suggest that aggregate strength may be mainly controlled by the coagulant, emphasizing the importance of the coagulant selection in water treatment. In addition, the use of both intrusive and non-intrusive techniques helped to confirm and expand previous experiments recently reported in literature.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Instituto de Geociências e Ciências Exatas Univ. Estadual Paulista (UNESP), Av. 24-A, 1515, Jardim Bela Vista, Rio ClaroPrograma de Pós-graduação em Engenharia Civil e Ambiental Univ. Estadual Paulista (UNESP), Av. 24-A, 1515, Jardim Bela Vista, Rio ClaroDepartment of Civil Engineering University of BirminghamDepartment of Civil Environmental and Geomatic Engineering University College London, Gower StInstituto de Geociências e Ciências Exatas Univ. Estadual Paulista (UNESP), Av. 24-A, 1515, Jardim Bela Vista, Rio ClaroPrograma de Pós-graduação em Engenharia Civil e Ambiental Univ. Estadual Paulista (UNESP), Av. 24-A, 1515, Jardim Bela Vista, Rio ClaroFAPESP: 2017/19195-7Universidade Estadual Paulista (Unesp)University of BirminghamUniversity College LondonMoruzzi, Rodrigo B. [UNESP]da Silva, Pedro Grava [UNESP]Sharifi, SorooshCampos, Luiza C.Gregory, John2019-10-06T15:34:15Z2019-10-06T15:34:15Z2019-06-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article265-273http://dx.doi.org/10.1016/j.seppur.2019.02.033Separation and Purification Technology, v. 217, p. 265-273.1873-37941383-5866http://hdl.handle.net/11449/18737510.1016/j.seppur.2019.02.0332-s2.0-85061820881Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengSeparation and Purification Technologyinfo:eu-repo/semantics/openAccess2021-10-23T18:56:51Zoai:repositorio.unesp.br:11449/187375Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T18:56:51Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Strength assessment of Al-Humic and Al-Kaolin aggregates by intrusive and non-intrusive methods |
title |
Strength assessment of Al-Humic and Al-Kaolin aggregates by intrusive and non-intrusive methods |
spellingShingle |
Strength assessment of Al-Humic and Al-Kaolin aggregates by intrusive and non-intrusive methods Moruzzi, Rodrigo B. [UNESP] Aggregates Floc resistance Flocculation Image analysis |
title_short |
Strength assessment of Al-Humic and Al-Kaolin aggregates by intrusive and non-intrusive methods |
title_full |
Strength assessment of Al-Humic and Al-Kaolin aggregates by intrusive and non-intrusive methods |
title_fullStr |
Strength assessment of Al-Humic and Al-Kaolin aggregates by intrusive and non-intrusive methods |
title_full_unstemmed |
Strength assessment of Al-Humic and Al-Kaolin aggregates by intrusive and non-intrusive methods |
title_sort |
Strength assessment of Al-Humic and Al-Kaolin aggregates by intrusive and non-intrusive methods |
author |
Moruzzi, Rodrigo B. [UNESP] |
author_facet |
Moruzzi, Rodrigo B. [UNESP] da Silva, Pedro Grava [UNESP] Sharifi, Soroosh Campos, Luiza C. Gregory, John |
author_role |
author |
author2 |
da Silva, Pedro Grava [UNESP] Sharifi, Soroosh Campos, Luiza C. Gregory, John |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) University of Birmingham University College London |
dc.contributor.author.fl_str_mv |
Moruzzi, Rodrigo B. [UNESP] da Silva, Pedro Grava [UNESP] Sharifi, Soroosh Campos, Luiza C. Gregory, John |
dc.subject.por.fl_str_mv |
Aggregates Floc resistance Flocculation Image analysis |
topic |
Aggregates Floc resistance Flocculation Image analysis |
description |
Resistance to breakage is a critical property of aggregates generated in water and wastewater treatment processes. After flocculation, aggregates should ideally keep their physical characteristics (i.e. size and morphology), to result in the best performance possible by individual separation processes. The integrity of aggregates after flocculation depends upon their capacity to resist shear forces while transported through canals, passages, apertures, orifices and other hydraulic units. In this study, the strength of Al-Humic and Al-Kaolin aggregates was investigated using two macroscopic measurement techniques, based on both intrusive and non-intrusive methods, using image analysis and light scattering based equipment. Each technique generates different information which was used for obtaining three floc strength indicators, namely, strength factor (SF), local stress from the hydrodynamic disturbance (σ) and the force coefficient (γ) for two different study waters. The results showed an increasing trend for the SF of both Al-Humic and Al-Kaolin aggregates, ranging from 29.7% to 78.6% and from 33.3% to 85.2%, respectively, in response to the increase of applied shear forces during flocculation (from 20 to 120 s−1). This indicates that aggregates formed at higher shear rates are more resistant to breakage than those formed at lower rates. In these conditions, σ values were observed to range from 0.07 to 0.44 N/m2 and from 0.08 to 0.47 N/m2 for Al-Humic and Al-Kaolin, respectively. Additionally, it was found that for all studied conditions, the resistance of aggregates to shear forces was nearly the same for Al-Humic and Al-Kaolin aggregates, formed from destabilized particles using sweep coagulation. These results suggest that aggregate strength may be mainly controlled by the coagulant, emphasizing the importance of the coagulant selection in water treatment. In addition, the use of both intrusive and non-intrusive techniques helped to confirm and expand previous experiments recently reported in literature. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-06T15:34:15Z 2019-10-06T15:34:15Z 2019-06-15 |
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/10.1016/j.seppur.2019.02.033 Separation and Purification Technology, v. 217, p. 265-273. 1873-3794 1383-5866 http://hdl.handle.net/11449/187375 10.1016/j.seppur.2019.02.033 2-s2.0-85061820881 |
url |
http://dx.doi.org/10.1016/j.seppur.2019.02.033 http://hdl.handle.net/11449/187375 |
identifier_str_mv |
Separation and Purification Technology, v. 217, p. 265-273. 1873-3794 1383-5866 10.1016/j.seppur.2019.02.033 2-s2.0-85061820881 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Separation and Purification Technology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
265-273 |
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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1803046608938467328 |