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Synergistic approach using ultrafiltered xylano-pectinolytic enzymes for reducing bleaching chemical dose in manufacturing rice straw paper

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Abstract

In this study, action of ultrafiltered xylano-pectinolytic enzymes from a bacterial strain has been evaluated for bleaching of rice straw soda-anthraquinone pulp. Maximum bio-bleaching effect and release of non-cellulosic impurities were noticed with xylano:pectinolytic enzymes dose of 6.0:2.1-IU/g pulp, treatment time of 180 min at 10% pulp consistency, pH 8.5, and temperature 55 °C. Microscopic images of bio-bleached rice straw pulp also confirmed the efficacy of ultrafiltered enzymes, as bleaching agent. This bio-bleaching treatment resulted in 15.38% and 32% reduction in kappa number and active chlorine dioxide dose, respectively, along with increase in various physical properties, burst index (12.50%), tear index (19.07%), breaking length (14.30%), double fold number (26.31%), Gurley porosity (45.32%) and viscosity (16.17%). This bio-bleaching approach not only improved the pulp quality but also reduced environmental pollution load by decreasing effluent parameters values of BOD and COD by 23.67% and 27.44%, respectively. This study indicates that use of ultrafiltered xylano-pectinolytic synergism for rice straw pulp bleaching will ultimately help in making the process eco-friendly, along with better quality pulp. This is the first report on use of ultrafiltered xylanase and pectinase, produced from a bacterial isolate, for bleaching of rice straw pulp.

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Acknowledgements

The authors thankfully acknowledge the financial support provided by Department of Biotechnology (DBT), Ministry of Science & Technology, Government of India (Grant Number: BT/ PR 20438 / BCE /8 /1220 / 2016 for 3 years). The corresponding author is also thankful to Avantha Centre for Industrial Research and Development (ACIRD), Yamuna Nagar, for providing laboratory facilities. First author is thankful to Kurukshetra University, Kurukshetra for providing the financial support in the form of University Research Scholarship.

Funding

The financial support was provided by Department of Biotechnology (DBT), Ministry of Science & Technology, Government of India (Grant Number: BT/PR20438/BCE/8/1220/2016 for 3 years).

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Ritu Mahajan (Corresponding Author): Idea of concept, planning and designing of various experiments done for this manuscript. Experimental work done by the first author for this manuscript under the corresponding author’s supervision. Raksha Nagpal (First Author): All experimental work mentioned in this manuscript done, both at Research laboratory and Paper Industry level, and also whole manuscript written by first author under the supervision of corresponding author. Nishi Kant Bhardwaj: Research work done, by first author, at Paper Industry level under his supervision.

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Correspondence to Ritu Mahajan.

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Nagpal, R., Bhardwaj, N.K. & Mahajan, R. Synergistic approach using ultrafiltered xylano-pectinolytic enzymes for reducing bleaching chemical dose in manufacturing rice straw paper. Environ Sci Pollut Res 27, 44637–44646 (2020). https://doi.org/10.1007/s11356-020-11104-4

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