Abstract
In this study, the potential of ultrafiltered xylano-pectinolytic enzymatic bleaching approach was investigated, for manufacturing wheat straw-based paper. The enzymatic step was found to be most effective, with xylanase–pectinase dose of 4–1.7 IU/g pulp and time period of 180 min. The absorption spectra of the pulp free filtrate samples obtained after treatment of the pulp with ultrafiltered enzymes showed the removal of more impurities, in comparison to the treatment with crude enzymes. Microscopic analysis also showed the removal of lignin impurities in enzymatically bleached pulp samples. This bleaching approach using enzymes resulted in 27% reduction in ClO2 dose. Ultrafiltered enzymes treated pulp samples also showed improved quality-related parameters, and Gurley porosity, burst index, breaking length, double fold, tear index, and viscosity increased by 19.05, 13.70, 8.18, 29.27, 4.41, and 13.27%, respectively. The lignin content, TDS, TSS, BOD and COD values also decreased in the effluent samples obtained after enzymatic bleaching plus 73% chemical bleaching dose. The BOD and COD values of the effluent samples improved by 23.01 and 23.66%, respectively. Thus, indicating the potential of ultrafiltered xylano-pectinolytic enzymes in reducing pollution during bleaching of wheat straw. This is the first study, mentioning the efficacy of ultrafiltered enzymes in the bleaching of wheat straw-based paper with better optical-strength-related properties and effluent characteristics.
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Acknowledgements
The authors are thankful to ACIRD, Yamuna Nagar, for providing us the facilities for testing various properties of wheat straw pulp samples.
Funding
The financial support for this work was provided by Department of Biotechnology, Ministry of Science & Technology, Government of India (Grant Number: BT/PR 20438/BCE/8/1220/2016 for 4 years).
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RM (corresponding author)—concept for this study and overall supervision of all experiments done. DS (first author)—performed all the experimental part at research laboratory level. SA—results obtained by first author got confirmed by him in the laboratory. RN—performed the experimental work at Paper Industry level. AK—performed the microscopic and absorption spectra analysis. NKB—did supervision of experiments at ACIRD, Yamuna Nagar.
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Sharma, D., Agrawal, S., Nagpal, R. et al. Valorization of wheat straw into paper by ultrafiltered enzymatic bleaching approach. Bioprocess Biosyst Eng 47, 289–297 (2024). https://doi.org/10.1007/s00449-023-02951-9
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DOI: https://doi.org/10.1007/s00449-023-02951-9