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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/13166
Title: Bio-conventional bleaching of kadam kraft-AQ pulp by thermo-alkali-tolerant xylanases from two strains of Coprinellus disseminatus for extenuating adsorbable organic halides and improving strength with optical properties and energy conservation
Authors: Lal M.
Dutt, Dharm
Tyagi C.H.
Published in: World Journal of Microbiology and Biotechnology
Abstract: Two novel thermo-alkali-tolerant crude xylanases namely MLK-01 (enzyme-A) and MLK-07 (enzyme-B) from Coprinellus disseminatus mitigated kappa numbers of Anthocephalus cadamba kraft-AQ pulps by 32.5 and 34.38%, improved brightness by 1.5 and 1.6% and viscosity by 5.75 and 6.47% after AXE1 and BXE1-stages, respectively. The release of reducing sugars and chromophores was the highest during prebleaching of A. cadamba kraft-AQ pulp at enzyme doses of 5 and 10 IU/g, reaction times 90 and 120 min, reaction temperatures 75 and 65°C and consistency 10% for MLK-01 and MLK-07, respectively. MLK-07 was more efficient than MLK01 in terms of producing pulp brightness, improving mechanical strength properties and reducing pollution load. MLK-01 and MLK-07 reduced AOX by 19.51 and 42.77%, respectively at 4% chlorine demands with an increase in COD and colour due to removal of lignin carbohydrates complexes. A. cadamba kraft-AQ pulps treated with xylanases from MLK-01 to MLK-07 and followed by CEHH bleaching at half chlorine demand (2%) showed a drastic reduction in brightness with slight improvement in mechanical strength properties compared to pulp bleached at 4% chlorine demand. MLK-01 reduced AOX, COD and colour by 43.83, 39.03 and 27.71% and MLK-07 by 38.34, 40.48 and 30.77%, respectively at half chlorine demand compared to full chlorine demand (4%). pH variation during prebleaching of A. cadamba kraft-AQ pulps with strains MLK-01 and MLK-07 followed by CEHH bleaching sequences showed a decrease in pulp brightness, AOX, COD and colour with an increase in mechanical strength properties, pulp viscosity and PFI revolutions to get a beating level of 35 ± 1 °SR at full chlorine demand. © 2011 Springer Science+Business Media B.V.
Citation: World Journal of Microbiology and Biotechnology (2012), 28(4): 1375-1387
URI: https://doi.org/10.1007/s11274-011-0937-6
http://repository.iitr.ac.in/handle/123456789/13166
Issue Date: 2012
Keywords: Anthocephalus cadamba
AOX
Bio-conventional bleaching
Brightness
Coprinellus disseminatus MLK01 and MLK07
PFI revolutions
Strength properties
ISSN: 9593993
Author Scopus IDs: 8626233500
7005982560
6602705260
Author Affiliations: Lal, M., Department of Paper Technology, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur 247 001, India
Dutt, D., Department of Paper Technology, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur 247 001, India
Tyagi, C.H., Department of Paper Technology, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur 247 001, India
Funding Details: Acknowledgments Authors acknowledge Ministry of Human Resource and Development, Government of India for awarding Senior Research Fellowship for conducting this piece of work.
Corresponding Author: Lal, M.; Department of Paper Technology, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur 247 001, India; email: dharmdutt4@gmail.com
Appears in Collections:Journal Publications [PT]

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