Enhancement of TCF and ECF Bleaching Processes by Urea and Enzymatic Pretreatments: Optimization of a Laccase-Mediator Pretreatment
A TCF bleaching sequence consisting of a urea pretreatment stage (U), laccase-mediator system stage (L), alkaline extraction stage (E), and hydrogen peroxide bleaching stage (P) was used to study the effect of five independent variables on the dependent variables pulp properties, hydrogen peroxide c...
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| Format: | Article |
| Language: | English |
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North Carolina State University
2015-02-01
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| Series: | BioResources |
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| Online Access: | http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_10_2_2289_Garcia_Fuentevilla_Enhancement_TCF_ECF_Bleaching |
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| author | Luisa L. García-Fuentevilla Raquel Martín-Sampedro Jose M. Carbajo Manuel J. Diaz María E. Eugenio |
| author_facet | Luisa L. García-Fuentevilla Raquel Martín-Sampedro Jose M. Carbajo Manuel J. Diaz María E. Eugenio |
| author_sort | Luisa L. García-Fuentevilla |
| collection | DOAJ |
| description | A TCF bleaching sequence consisting of a urea pretreatment stage (U), laccase-mediator system stage (L), alkaline extraction stage (E), and hydrogen peroxide bleaching stage (P) was used to study the effect of five independent variables on the dependent variables pulp properties, hydrogen peroxide consumption, and residual enzyme activity. Results showed that the most influential variable was L stage pulp consistency, followed by mediator and laccase dosages. On the other hand, oxygen pressure did not have a significant effect. The optimal UL partial sequence significantly enhanced the EP bleaching sequence: 49.8% vs. 33.4% delignification, up to 65.6% ISO vs. 56.3% ISO bleached brightness, and 50.3% vs. 89.9% peroxide consumption in the P stage. The ULE partial sequence also improved an ECF bleaching sequence (ULED0E1D1): 0.6 vs. 1.0 final kappa number; 82.7% ISO vs. 76.0% ISO brightness; and 54.1 N∙m∙g-1 vs. 51.9 N∙m∙g-1 and 3.3 KPa∙m2∙g-1 vs. 2.7 KPa∙m2∙g-1, tensile and burst indexes, respectively, when compared to the control D0E1D1 sequence. |
| first_indexed | 2024-12-21T01:18:27Z |
| format | Article |
| id | doaj.art-35092c1514e84f1bbdbe2978df8428e6 |
| institution | Directory Open Access Journal |
| issn | 1930-2126 1930-2126 |
| language | English |
| last_indexed | 2024-12-21T01:18:27Z |
| publishDate | 2015-02-01 |
| publisher | North Carolina State University |
| record_format | Article |
| series | BioResources |
| spelling | doaj.art-35092c1514e84f1bbdbe2978df8428e62022-12-21T19:20:44ZengNorth Carolina State UniversityBioResources1930-21261930-21262015-02-011022289230410.15376/biores.10.2.2289-2304Enhancement of TCF and ECF Bleaching Processes by Urea and Enzymatic Pretreatments: Optimization of a Laccase-Mediator PretreatmentLuisa L. García-Fuentevilla0Raquel Martín-Sampedro1Jose M. Carbajo2Manuel J. Diaz3María E. Eugenio4Instituto de Investigación y Tecnología Agraria y Agroalimentaria INIA, Carretera de la Coruña, km 7.5, 28040, Madrid; SpainINIA - CIFOR; SpainINIA - CIFOR; SpainDepartamento de Ingeniería Química. Universidad de Huelva, Campus el Carmen, 21071, Huelva (Spain); SpainINIA - CIFOR; SpainA TCF bleaching sequence consisting of a urea pretreatment stage (U), laccase-mediator system stage (L), alkaline extraction stage (E), and hydrogen peroxide bleaching stage (P) was used to study the effect of five independent variables on the dependent variables pulp properties, hydrogen peroxide consumption, and residual enzyme activity. Results showed that the most influential variable was L stage pulp consistency, followed by mediator and laccase dosages. On the other hand, oxygen pressure did not have a significant effect. The optimal UL partial sequence significantly enhanced the EP bleaching sequence: 49.8% vs. 33.4% delignification, up to 65.6% ISO vs. 56.3% ISO bleached brightness, and 50.3% vs. 89.9% peroxide consumption in the P stage. The ULE partial sequence also improved an ECF bleaching sequence (ULED0E1D1): 0.6 vs. 1.0 final kappa number; 82.7% ISO vs. 76.0% ISO brightness; and 54.1 N∙m∙g-1 vs. 51.9 N∙m∙g-1 and 3.3 KPa∙m2∙g-1 vs. 2.7 KPa∙m2∙g-1, tensile and burst indexes, respectively, when compared to the control D0E1D1 sequence.http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_10_2_2289_Garcia_Fuentevilla_Enhancement_TCF_ECF_BleachingPycnoporus sanguineusUreaBleaching variablesKraft pulpEucalyptus globulusOptimization |
| spellingShingle | Luisa L. García-Fuentevilla Raquel Martín-Sampedro Jose M. Carbajo Manuel J. Diaz María E. Eugenio Enhancement of TCF and ECF Bleaching Processes by Urea and Enzymatic Pretreatments: Optimization of a Laccase-Mediator Pretreatment BioResources Pycnoporus sanguineus Urea Bleaching variables Kraft pulp Eucalyptus globulus Optimization |
| title | Enhancement of TCF and ECF Bleaching Processes by Urea and Enzymatic Pretreatments: Optimization of a Laccase-Mediator Pretreatment |
| title_full | Enhancement of TCF and ECF Bleaching Processes by Urea and Enzymatic Pretreatments: Optimization of a Laccase-Mediator Pretreatment |
| title_fullStr | Enhancement of TCF and ECF Bleaching Processes by Urea and Enzymatic Pretreatments: Optimization of a Laccase-Mediator Pretreatment |
| title_full_unstemmed | Enhancement of TCF and ECF Bleaching Processes by Urea and Enzymatic Pretreatments: Optimization of a Laccase-Mediator Pretreatment |
| title_short | Enhancement of TCF and ECF Bleaching Processes by Urea and Enzymatic Pretreatments: Optimization of a Laccase-Mediator Pretreatment |
| title_sort | enhancement of tcf and ecf bleaching processes by urea and enzymatic pretreatments optimization of a laccase mediator pretreatment |
| topic | Pycnoporus sanguineus Urea Bleaching variables Kraft pulp Eucalyptus globulus Optimization |
| url | http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_10_2_2289_Garcia_Fuentevilla_Enhancement_TCF_ECF_Bleaching |
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