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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/13246
Title: Effect of xylanases from Aspergillus niger NKUC3-0.2 mutant strain on prebleaching of wheat straw and mixed hardwood pulps
Authors: Kapur N.
Dutt, Dharm
Singh R.P.
Tyagi C.H.
Nand V.
Published in: Cellulose Chemistry and Technology
Abstract: Effects of Aspergillus niger NKUC3-0.2 pretreatment on total chlorine demand during conventional bleaching sequence of pulp and its impact on pulp brightness, viscosity, effluent characteristics and mechanical strength of wheat straw and mixed hardwood were studied. The xylanase production by A. niger NKUC3-0.2 was found optimum after the 3rd day of incubation under solid-state fermentation conditions using cotton hull as the solid matrix. Optimal temperature and pH were found to be 34°C and 7.0, respectively. An enzyme addition of 40 IU g-1 of pulp at 65°C, pH 7.0, reaction time 2 hours and consistency 10% was found optimum to reduce kappa number of pulp to the maximum extent. BOD5 days, COD, and AOX of effluents generated by XCEHH bleaching sequence of wheat straw are reduced by 7.3, 8.8 and 22.22%, respectively. On the other hand, brightness and viscosity of wheat straw pulps improved by 0.8% (ISO) and 7.69%, respectively. BOD 5 days, COD, and AOX of effluent generated by XCEHH bleaching sequence of mixed hardwood pulp were reduced by 50.3, 33.8 and 31.6%, respectively, while brightness and viscosity improved by 1.2 and 25%, respectively.
Citation: Cellulose Chemistry and Technology (2006), 40(8): 635-641
URI: http://repository.iitr.ac.in/handle/123456789/13246
Issue Date: 2006
Keywords: Bleaching
Prebleaching
Soda and kraft pulping
Strength properties
Xylanases
ISSN: 5769787
Author Scopus IDs: 8781230800
7005982560
36067529400
6602705260
19337398100
Author Affiliations: Kapur, N., Department of Biotechnology, Indian Institute of Technology Roorkee, India
Dutt, D., Department of Paper Technology, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur, India
Singh, R.P., Department of Biotechnology, Indian Institute of Technology Roorkee, India
Tyagi, C.H., Department of Paper Technology, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur, India
Nand, V., Department of Biotechnology, Indian Institute of Technology Roorkee, India
Corresponding Author: Kapur, N.; Department of Biotechnology, Indian Institute of Technology RoorkeeIndia
Appears in Collections:Journal Publications [PT]

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