Abstract
The economy of the bioethanol production process can be improved by increasing the initial solid content and reducing the reaction time. The enzymatic approach utilizing intermittent ball milling has been proposed as a viable solution to tackle these challenges effectively. This study demonstrated that intermittent ball milling during high-solids enzymatic hydrolysis for a duration of 12 h showed a significantly higher total sugar yield, with an increase of 25.8% compared to continuous ball milling enzymatic hydrolysis method. The subsequent investigation comprehensively examined the impact of multi-conditional parameter variations on sugar yield during intermittent ball milling. The orthogonal experiment resulted in the determination of optimal process parameters, including a solid–liquid ratio of 25%, ball milling time (per cycle) of 5 min, ball milling frequency of 50 Hz, 6 balls used during the process, and an incubation temperature of 50℃ under optimized conditions. The conditions led to the achievement of a total reducing sugar concentration of 103.8 g/L, a total sugar yield of 415.1 mg/g, and an enzymatic hydrolysis yield of 72.4%. The optimized intermittent ball milling process exhibited superior hydrolysis yield and shorter reaction time compared to other enzymatic methods with untreated biomass. This study holds significant implications for the eventual industrialization of bioethanol refinement.
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Funding
This study was supported by the National Natural Science Foundation of China (No. 32301723), the Postdoctoral Science Foundation of China (No.2020M671367), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (20KJB416009), the Innovation/Entrepreneurship Program of Jiangsu Province and the Priority Academic Program Development of Jiangsu Higher Education Institutions (No. PAPD-2018–87).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Bo Zhang, Yuchen Xing, Guanya Ji and Tianyan You. The first draft of the manuscript was written by Bo Zhang and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Highlights
• Intermittent ball milling effectively mitigated the "high-solids effect".
• The effect of conditional parameters on sugar yield was investigated.
• Optimal process parameters were obtained by orthogonal experiment.
• The hydrolysis efficiency of rice straw reached 72.4% without pretreatment.
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Zhang, B., Xing, Y., Ji, G. et al. Effect of intermittent ball milling on high-solids enzymatic saccharification of rice straw. Biomass Conv. Bioref. (2024). https://doi.org/10.1007/s13399-024-05429-0
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DOI: https://doi.org/10.1007/s13399-024-05429-0