‘Single lay out’ and ‘mixed lay out’ enzymatic processes for bio-bleaching of kraft pulp |
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Authors: | Saurabh Sudha Dhiman Gaurav Garg Ritu Mahajan Neelam Garg Jitender Sharma |
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Institution: | 1. Thapar Center for Industrial Research and Development (TCIRD-RCDP), Yamunanagar, India;2. Department of Biotechnology, Kurukshetra University, Kurukshetra 136 119, India;3. Department of Microbiology, Kurukshetra University, Kurukshetra 136119, India |
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Abstract: | 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 °C using 5 U/g of xylanase at pH 9.5 and 12.5 whereas strategy II was carried out at 70 °C using 5 U/g of each of the enzyme, respectively at pH 9.5. Bio-bleaching caused 15% and 20% less Cl2 consumption though strategy I and II, respectively over chemical bleaching. Strategy II was proved to be 35.71% more efficient in ClO2 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. |
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Keywords: | Kappa number Pectinase Permanganate number Tearness Xylanase |
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