English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/46754
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Title

Biobleaching of high quality pulps with laccase mediator system: Influence of treatment time and oxygen supply

AuthorsFillat, Ursula ; Roncero, M. Blanca
KeywordsDelignification
Refluents
Flax Pulp
1-Hydroxybenzotriazole
Laccase
Optical Properties
Oxygen
Reaction Time
CIE L*a*b* Coordinates
COD
Viscosity
Chromophore
Issue Date2009
PublisherElsevier
CitationBiochemical Engineering Journal 44(2-3):193-198(2009)
AbstractIn this study we examined the influence of the treatment time and addition of oxygen on the efficiency of a laccase mediator system (L) applied to flax pulp at atmospheric pressure. The redox potential and the dissolved oxygen concentration during L tests are measured. After L stage, an alkaline extraction (E) is carried out. The pulp properties (kappa number, brightness and viscosity) and the effluents properties (color and COD) were measured in order to evaluate the environmental impact of this enzymatic treatment. The biotreatment involves two distinct stages in both L and LE sequences; in the beginning the pulp exhibits a fast delignification and a slow viscosity decrease that is followed by slow delignification in the second. Pulp brightness changed differently during L stage and LE sequence. Initially brightness after the L stage decreased with respect to the initial pulp; then, it increased rapidly and eventually leveled off. After the LE sequence, brightness increased rapidly in the beginning and more gradually afterwards. The results show that supplying the medium with oxygen and increasing the oxygen concentration in it, influence the kinetics of the process. Based on CIE L*a*b* color coordinates study, the enzyme treatment not only removes lignin, but also alters the structure of the pulp by causing the formation of chromophoric groups giving color. Such groups are removed in an E stage.
Description6 páginas, 10 figuras -- PAGS bros. 193-198
Publisher version (URL)http://dx.doi.org/10.1016/j.bej.2008.12.002
URIhttp://hdl.handle.net/10261/46754
DOI10.1016/j.bej.2008.12.002
ISSN1369-703X
Appears in Collections:(CIB) Artículos
Files in This Item:
There are no files associated with this item.
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.