Kraft pulp biobleaching using an extracellular enzymatic fluid produced by Pycnoporus sanguineus.
The aim of this work was to obtain a LMS pre-treatment applicable to industrial TCF bleaching. Kraft pulp from Eucalyptus globulus was treated at 40 degrees C/pH 3 and 60 degrees C/pH 5 for 1h using an extracellular fluid enriched in laccase produced by Pycnoporus sanguineus and acetosyringone as mediator (HBT was used as a control mediator) (L). Alkaline extraction (E) and hydrogen peroxide (P) stages were then assayed. The LEP alternative was an efficient sequence to bleach kraft pulp since the enzymatic pre-treatment boosted the subsequent chemical bleaching. The best L pre-treatment was obtained with laccase-acetosyringone at 40 degrees C/pH 3. It reduces kappa number and hexenuronic acids, increases pulp viscosity, lowers hydrogen peroxide consumption down to an 87.4% (94.0% without L) and enhances brightness up to a 59% ISO (51% ISO without L).
Eugenio
M E
ME
CIFOR-INIA, Ctra de La Coruña km 7.5, 28040 Madrid, Spain.
Santos
S M
SM
Carbajo
J M
JM
Martín
J A
JA
Martín-Sampedro
R
R
González
A E
AE
Villar
J C
JC
D000098:Acetophenones / Q000737:chemistry; D001709:Biotechnology / Q000379:methods*; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D042845:Laccase / Q000737:chemistry; D008027:Light; D016877:Oxidants / Q000737:chemistry; D010209:Paper; D055494:Pycnoporus / Q000378:metabolism*; D013696:Temperature; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods
D000098:Acetophenones; D007220:Industrial Waste; D016877:Oxidants; C051667:acetosyringone; D006861:Hydrogen Peroxide; D042845:Laccase