'Single lay out' and 'mixed lay out' enzymatic processes for bio-bleaching of kraft pulp.
Xylanase alone as 'single lay out' (strategy I) and in combination with pectinase as 'mixed lay out' (strategy II) was used to investigate their bio-bleaching potentials. Strategy I was carried at 70 degrees C using 5 U/g of xylanase at pH 9.5 and 12.5 whereas strategy II was carried out at 70 degrees C using 5 U/g of each of the enzyme, respectively at pH 9.5. Bio-bleaching caused 15% and 20% less Cl(2) consumption though strategy I and II, respectively over chemical bleaching. Strategy II was proved to be 35.71% more efficient in ClO(2) saving than conventional method. Significant improvement in various pulp properties viz. tensile strength 25.70%, breaking length 21.80%, burst factor 20.00%, burstness 13.86%, tear factor 6.61% and tearness 18.88%, was also observed through 'mixed lay out' strategy.
Dhiman
Saurabh Sudha
SS
Thapar Center for Industrial Research and Development, Yamunanagar, India.
Garg
Gaurav
G
Mahajan
Ritu
R
Garg
Neelam
N
Sharma
Jitender
J
D001709:Biotechnology / Q000379:methods*; D017606:Chlorine Compounds / Q000378:metabolism; D043364:Endo-1,4-beta Xylanases / Q000378:metabolism*; D010087:Oxides / Q000378:metabolism; D010209:Paper; D011096:Polygalacturonase / Q000378:metabolism*
D017606:Chlorine Compounds; D010087:Oxides; C025109:chlorine dioxide; D011096:Polygalacturonase; D043364:Endo-1,4-beta Xylanases