Disruption of lignocellulosic biomass along the length of the screws with different screw elements in a twin-screw extruder. (March 2019)

• Record Type: Journal Article
• Authors: Gu, Bon-Jae; Dhumal, Gaurav S.; Wolcott, Michael P.; Ganjyal, Girish M.
• Is Part Of: Bioresource technology. Volume 275(2019)
• Page Start: 266
• Page End: 271
• Publication Date: 2019-03
• Subjects: Lignocellulosic biomass -- Enzymatic hydrolysis -- Physical pretreatment -- Extrusion -- Screw; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2018.12.033
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Lowest barrel temperature and screw speed resulted in the highest sugar yield. Specific mechanical energy had a notable positive correction with sugar yield. Reverse screw element resulted in high shear energy, increasing the sugar yield. Screw speed impacted the degree of re-agglomeration during extrusion process. Abstract: Proper screw design is crucial for effectively pre-treating wood fibers, to assist in the downstream enzymatic conversion of the cellulose into fermentable sugars. Initially, the impact of extruder barrel temperature (50, 100, and 150 °C) and screw speed (25, 50, and 75 rpm) were studied to arrive at the optimum conditions for sugar yield. Lower temperatures and screw speeds resulted in increased sugar yields. To examine the influence of shear imparted by the screws, the residuals samples were recovered from different zones along the screws and evaluated. Sugar yield, crystallinity index, and the particle size distribution of the material collected at different zones were determined. Glucose yield and xylose/mannose yields of the material along the screws, ranged from 23.25 to 42.88% and from 11.95 to 20.54%, respectively. The importance of the screw design was highlighted.