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Assessing the environmental impact of biobleaching: effects of the operational conditions
info:eu-repo/semantics/openAccess ;ISSN: 0960-8524 ;EISSN: 1873-2976 ;DOI: 10.1016/j.biortech.2011.10.044
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Title:
Assessing the environmental impact of biobleaching: effects of the operational conditions
Author:
Valls Vidal, Cristina
;
Quintana, Elisabet
;
Roncero Vivero, María Blanca
Subjects:
Biobleaching
;
Blanqueig
;
Blanqueig de pastes
;
Effluent properties
;
Enginyeria paperera
;
Kraft paper industry
;
Laccase
;
Paper industry
;
Pasta paperera
;
Toxicity
;
Wood
-
pulp
Bleaching
;
Xylanase
;
Àrees temàtiques de la UPC
Description:
The environmental impact of enzyme bleaching stages applied to oxygen-delignified eucalypt kraft pulp was assessed via the chemical oxygen demand (COD), color, absorbance spectrum, residual enzyme activity and Microtox toxicity of the effluents from a laccase–HBT (1-hydoxybenzotriazole) treatment. The influence of the laccase and HBT doses, and reaction time, on these effluent properties was also examined. The laccase dose was found to be the individual variable most strongly affecting COD, whereas the oxidized form of HBT was the main source of increased color and toxicity in the effluents. Moreover, it inactivated the enzyme. Oxidation of the mediator was very fast and essentially dependent on the laccase dose. Using the laccase–mediator treatment after a xylanase stage improved pulp properties without affecting effluent properties. This result holds great promise with a view to the industrial implementation of biobleaching sequences involving the two enzymes in the future.
Creation Date:
2012-01
Language:
English
Identifier:
ISSN: 0960-8524
EISSN: 1873-2976
DOI: 10.1016/j.biortech.2011.10.044
Source:
Recercat
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