Steam Pretreatment of Rice Hulls to Release Fermentable Saccharides: An Approach to Improve Recovery of (Hemi)Cellulosic Sugars Through Multivariate Design |
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Authors: | Montip Sheila Roslander Christian Camassola Marli Galbe Mats Wallberg Ola |
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Institution: | 1.Department of Chemical Engineering, Lund University, P. O. Box 124, Lund SE-221 00, Sweden;2.Biotechnology Institute, University of Caxias do Sul, Caxias do Sul 95070-560, Brazil |
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Abstract: | The conversion of rice hulls into fermentable saccharides was explored through steam pretreatment employing 2.5% SO2. The interaction between temperature and time was assessed by means of the response surface method to achieve optimum contents of C6-sugars in water-insoluble solids (WIS) and C5-sugars in the liquor. Pretreatment carried out at 218 °C for 2.3 min released liquor containing 55.4 g/L of sugars (29.1 g/L of xylose). In parallel, the WIS was subjected to enzymatic saccharification using different solid and enzyme loads via an experimental design: assays using 22.0% WIS and 20.0 filter paper units (FPU)/g led to 90.6 g/L of glucose, corresponding to a yield of 86.4% and an overall yield of 72.4%. The data reported are the highest ever found for such raw material, making it attractive to compete with conventional lignocellulosic biomass. |
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Keywords: | lignocellulosic feedstock sulfur dioxide high solid loading hydrolysis central composite rotatable design |
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