Optimization of Combined Hydrothermal and Mechanical Refining Pretreatment of Forest Residue Biomass for Maximum Sugar Release during Enzymatic Hydrolysis

Md Shahadat Hossain, Obste Therasme, Timothy A. Volk, Vinod Kumar and Deepak Kumar ()
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Md Shahadat Hossain: Department of Chemical Engineering, SUNY College of Environmental Science and Forestry, Syracuse, NY 13210, USA
Obste Therasme: Department of Sustainable Resources Management, SUNY College of Environmental Science and Forestry, Syracuse, NY 13210, USA
Timothy A. Volk: Department of Sustainable Resources Management, SUNY College of Environmental Science and Forestry, Syracuse, NY 13210, USA
Vinod Kumar: School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK
Deepak Kumar: Department of Chemical Engineering, SUNY College of Environmental Science and Forestry, Syracuse, NY 13210, USA

Energies, 2024, vol. 17, issue 19, 1-19

Abstract: This study aimed to investigate the effect of chemical-free two-stage hydrothermal and mechanical refining pretreatment on improving the sugar yields during enzymatic hydrolysis of forest residue biomass (FRB) and optimize the pretreatment conditions. Hot-water pretreatment experiments were performed using a central composite design for three variables: temperature (160–200 °C), time (10–20 min), and solid loading (10–20%). Hydrothermally pretreated biomass was subsequently pretreated using three cycles of disk refining. The combined pretreatment was found to be highly effective in enhancing sugar yields during enzymatic hydrolysis, with almost 99% cellulose conversion for biomass pretreated at 213.64 °C, 15 min, and 15% solid loading. However, the xylose concentrations in the hydrolysate were found to be low under these conditions due to sugar degradation. Thus, less severe optimum pretreatment conditions (194.78 °C, 12.90 min, and 13.42% solid loading) were predicted using a second-order polynomial model. The response surface model optimized the hydrothermal pretreatment of FRB and predicted the glucan, xylan, and overall conversions of 94.57%, 79.78%, and 87.84%, respectively, after the enzymatic hydrolysis. The model-predicted biomass conversion values were validated by the experimental results.

Keywords: hydrothermal pretreatment; disk milling; forest residue biomass; enzymatic hydrolysis; response surface methodology (RSM); central composite design (CCD) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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