Synergistic approach using ultrafiltered xylano-pectinolytic enzymes for reducing bleaching chemical dose in manufacturi
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SHORT RESEARCH AND DISCUSSION ARTICLE
Synergistic approach using ultrafiltered xylano-pectinolytic enzymes for reducing bleaching chemical dose in manufacturing rice straw paper Raksha Nagpal 1 & Nishi Kant Bhardwaj 2 & Ritu Mahajan 1 Received: 29 April 2020 / Accepted: 4 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
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 biobleaching 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 xylanopectinolytic 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. Keywords Ultrafiltered enzymes . Bio-bleaching . Rice straw . Soda-anthraquinone pulp . Bleaching effluent . Xylanase . Pectinase . Kappa number
Introduction Paper industries are one of the major contributors to overall pollution load on this earth. The demand for paper is continuously going up, due to increase in world population growth and literacy rate. In the current scenario, bleaching of paper pulp with enzymes is the only solution for reducing the pollution-related issues in paper industries. High-molecular weight chlorophenols generated in post pulp bleaching effluent are converted into active forms such as catechols and
Responsible Editor: Ta Yeong Wu * Ritu Mahajan [email protected] 1
Department of Biotechnology, Kurukshetra University, Kurukshetra, India
2
Avantha Centre for Industrial Research and Development, Paper Mill Campus, Yamuna Nagar, India
guaiacols. The effluent with chlorocatechols and chlorophenols is the major source for inducing mutations in living tissues as well as responsible for chronic health diseases (Ghosh 2006; Igbinttosa et al. 2013). The chemical loaded effluent is also dangerous for aquatic life as well as for the environment (Hossain and Rao 2014; Raj et al. 2014; Hossain and Ismail 2015), responsible for high eutrophication, algal bloom, toxicity, bio-magnifi
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