THE EFFECT OF WATER REDUCTION IN KRAFT PULP WASHING IN ECF BLEACHING
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/0100-67622016000600015 http://hdl.handle.net/11449/162482 |
Resumo: | The main objective of this work was to study the technical viability of using the cellulose bleaching effluent, at several stages of the process, seeking fresh water reduction in pulp washing, and evaluating its effect on pulp quality. Eucalyptus spp. industrial cellulosic pulp with oxygen was used in this experiment. The same bleaching sequence D(E+P) DP was performed ten times, under the same conditions (temperature, consistency and time). Counter current washing was used in the bleaching stages, and each sequence was carried out with different washing factors: 9, 6, 3, 0 m(3) of distilled water/ton of pulp, trying to reach brightness of 92 +/- 0,5% ISO. The ten sequences sought to achieve the stability of the effluent organic load, measured by the chemical oxygen demand (COD). Then, the COD results were compared to the brightness ones from the bleached pulp. The evaluated results from the ten sequences and four different washings showed an increasing in COD due to the organic load accumulation, resulting from the reuse of effluent from previous sequences. This COD increasing provided the lower brightness results during the cycles, besides the water reduction, evidencing the necessity of washing between bleaching stages. In this study, the obtained result for the pulp washing up to 3m(3)/t was tolerable and even recommended. On the other hand, the pulp without any washing (0 m(3)/t), due to the lack of enough brightness, it is commercially unviable. |
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THE EFFECT OF WATER REDUCTION IN KRAFT PULP WASHING IN ECF BLEACHINGPulpBleachingEucalyptusThe main objective of this work was to study the technical viability of using the cellulose bleaching effluent, at several stages of the process, seeking fresh water reduction in pulp washing, and evaluating its effect on pulp quality. Eucalyptus spp. industrial cellulosic pulp with oxygen was used in this experiment. The same bleaching sequence D(E+P) DP was performed ten times, under the same conditions (temperature, consistency and time). Counter current washing was used in the bleaching stages, and each sequence was carried out with different washing factors: 9, 6, 3, 0 m(3) of distilled water/ton of pulp, trying to reach brightness of 92 +/- 0,5% ISO. The ten sequences sought to achieve the stability of the effluent organic load, measured by the chemical oxygen demand (COD). Then, the COD results were compared to the brightness ones from the bleached pulp. The evaluated results from the ten sequences and four different washings showed an increasing in COD due to the organic load accumulation, resulting from the reuse of effluent from previous sequences. This COD increasing provided the lower brightness results during the cycles, besides the water reduction, evidencing the necessity of washing between bleaching stages. In this study, the obtained result for the pulp washing up to 3m(3)/t was tolerable and even recommended. On the other hand, the pulp without any washing (0 m(3)/t), due to the lack of enough brightness, it is commercially unviable.Univ Estadual Paulista, Programa Pos Grad Engn Mecan, Guaratingueta, SP, BrazilUniv Estadual Paulista, Itapeva, SP, BrazilUniv Estadual Paulista, Programa Pos Grad Engn Mecan, Guaratingueta, SP, BrazilUniv Estadual Paulista, Itapeva, SP, BrazilUniv Federal VicosaUniversidade Estadual Paulista (Unesp)Frigieri, Tania Cristina [UNESP]Ventorim, Gustavo [UNESP]Comelato Favaro, Jaqueline Silveira [UNESP]2018-11-26T17:18:29Z2018-11-26T17:18:29Z2016-11-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1101-1108application/pdfhttp://dx.doi.org/10.1590/0100-67622016000600015Revista Arvore. Vicosa: Univ Federal Vicosa, v. 40, n. 6, p. 1101-1108, 2016.0100-6762http://hdl.handle.net/11449/16248210.1590/0100-67622016000600015S0100-67622016000601091WOS:000394167100015S0100-67622016000601091.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengRevista Arvore0,458info:eu-repo/semantics/openAccess2024-07-01T20:32:30Zoai:repositorio.unesp.br:11449/162482Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:42:27.879281Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
THE EFFECT OF WATER REDUCTION IN KRAFT PULP WASHING IN ECF BLEACHING |
title |
THE EFFECT OF WATER REDUCTION IN KRAFT PULP WASHING IN ECF BLEACHING |
spellingShingle |
THE EFFECT OF WATER REDUCTION IN KRAFT PULP WASHING IN ECF BLEACHING Frigieri, Tania Cristina [UNESP] Pulp Bleaching Eucalyptus |
title_short |
THE EFFECT OF WATER REDUCTION IN KRAFT PULP WASHING IN ECF BLEACHING |
title_full |
THE EFFECT OF WATER REDUCTION IN KRAFT PULP WASHING IN ECF BLEACHING |
title_fullStr |
THE EFFECT OF WATER REDUCTION IN KRAFT PULP WASHING IN ECF BLEACHING |
title_full_unstemmed |
THE EFFECT OF WATER REDUCTION IN KRAFT PULP WASHING IN ECF BLEACHING |
title_sort |
THE EFFECT OF WATER REDUCTION IN KRAFT PULP WASHING IN ECF BLEACHING |
author |
Frigieri, Tania Cristina [UNESP] |
author_facet |
Frigieri, Tania Cristina [UNESP] Ventorim, Gustavo [UNESP] Comelato Favaro, Jaqueline Silveira [UNESP] |
author_role |
author |
author2 |
Ventorim, Gustavo [UNESP] Comelato Favaro, Jaqueline Silveira [UNESP] |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Frigieri, Tania Cristina [UNESP] Ventorim, Gustavo [UNESP] Comelato Favaro, Jaqueline Silveira [UNESP] |
dc.subject.por.fl_str_mv |
Pulp Bleaching Eucalyptus |
topic |
Pulp Bleaching Eucalyptus |
description |
The main objective of this work was to study the technical viability of using the cellulose bleaching effluent, at several stages of the process, seeking fresh water reduction in pulp washing, and evaluating its effect on pulp quality. Eucalyptus spp. industrial cellulosic pulp with oxygen was used in this experiment. The same bleaching sequence D(E+P) DP was performed ten times, under the same conditions (temperature, consistency and time). Counter current washing was used in the bleaching stages, and each sequence was carried out with different washing factors: 9, 6, 3, 0 m(3) of distilled water/ton of pulp, trying to reach brightness of 92 +/- 0,5% ISO. The ten sequences sought to achieve the stability of the effluent organic load, measured by the chemical oxygen demand (COD). Then, the COD results were compared to the brightness ones from the bleached pulp. The evaluated results from the ten sequences and four different washings showed an increasing in COD due to the organic load accumulation, resulting from the reuse of effluent from previous sequences. This COD increasing provided the lower brightness results during the cycles, besides the water reduction, evidencing the necessity of washing between bleaching stages. In this study, the obtained result for the pulp washing up to 3m(3)/t was tolerable and even recommended. On the other hand, the pulp without any washing (0 m(3)/t), due to the lack of enough brightness, it is commercially unviable. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-11-01 2018-11-26T17:18:29Z 2018-11-26T17:18:29Z |
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/10.1590/0100-67622016000600015 Revista Arvore. Vicosa: Univ Federal Vicosa, v. 40, n. 6, p. 1101-1108, 2016. 0100-6762 http://hdl.handle.net/11449/162482 10.1590/0100-67622016000600015 S0100-67622016000601091 WOS:000394167100015 S0100-67622016000601091.pdf |
url |
http://dx.doi.org/10.1590/0100-67622016000600015 http://hdl.handle.net/11449/162482 |
identifier_str_mv |
Revista Arvore. Vicosa: Univ Federal Vicosa, v. 40, n. 6, p. 1101-1108, 2016. 0100-6762 10.1590/0100-67622016000600015 S0100-67622016000601091 WOS:000394167100015 S0100-67622016000601091.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Revista Arvore 0,458 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
1101-1108 application/pdf |
dc.publisher.none.fl_str_mv |
Univ Federal Vicosa |
publisher.none.fl_str_mv |
Univ Federal Vicosa |
dc.source.none.fl_str_mv |
Web of Science 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_ |
1808128848634576896 |