Issue |
E3S Web Conf.
Volume 428, 2023
2023 Research, Invention, and Innovation Congress (RI2C 2023)
|
|
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Article Number | 01010 | |
Number of page(s) | 7 | |
Section | Energy Technology | |
DOI | https://doi.org/10.1051/e3sconf/202342801010 | |
Published online | 14 September 2023 |
Process Optimization of Deep Eutectic Solvent Pretreatment of Coffee Husk Biomass
1 Biorefinery and Process Automation Engineering Center, Department of Chemical and Process Engineering, The Sirindhorn International Thai-German Graduate School of Engineering, King Mongkut’s University of Technology North Bangkok Bangkok, Thailand
2 Food and Nutritional Science Department, Faculty of Agricultural, Life and Environmental, Sciences, Agricultural, University of Alberta, Edmonton, AB, Canada
3 College of Engineering Guindy, Anna University, Chennai, India
4 Department of Mechanical Engineering, Saveetha School of Engineering, SIMATS, Chennai, India
5 Department of Microbiology, Faculty of Science, Srinakharinwirot University, Bangkok, Thailand
6 Department of Food Biotechnology, Faculty of Biotechnology, Assumption University, Bangkok, Thailand
* Corresponding author: elizabeth.jayex@gmail.com
The increased processing of coffee beans has generated huge amount of coffee husk, which are improperly disposed. Inappropriate disposal of coffee husk has led to release of toxic compounds to the environment causing serious environmental concerns. To mitigate the impact of improperly disposed coffee husk, it is suggested for valorisation of the coffee husk. Hence, this study has focussed on identifying the potential of coffee husk in maximizing the sugar yield from it which can be converted to value added product. Deep eutectic solvent (DES) involving choline chloride and lactic acid (ChCl:LA) mixed at 1:4 molar ratio was studied to investigate the effect of DES pretreatment on coffee husk to produce reducing sugar in the hydrolysis process. Pretreatment conditions of the biomass were optimized for biomass loading (5-20%, w/w), temperature (70-120 °C), and duration (60-240 min) using Response Surface Methodology (RSM) for obtaining maximum yield of reducing sugar. The RSM model predicted an optimal pretreatment condition of biomass loading with 20% (w/w), pretreated at 120 °C for 231.80 min to achieve maximum sugar yield (30.522%). The pretreatment effect on biomass composition was analyzed using the Van Soest method, which showed an increase in the cellulose content along with the hemicellulose removal when compared with the native biomass. Moreover, evaluation of chemical structural changes also confirmed the effectiveness of DES pretreatment. Thus, the current study would illustrate the potential of coffee husk to produce value-added compounds from it.
Key words: Biofuels / Biorefinery / Coffee husk / DES pretreatment / Lignocellulosic biomass
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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