Department of Agricultural and Biosystems Engineering, North Dakota State University, 1221 Albrecht Blvd, Fargo, ND 58102, USA.
Bioresour Technol. 2012 Jul;116:36-41. doi: 10.1016/j.biortech.2012.04.054. Epub 2012 Apr 21.
Switchgrass was pelleted to evaluate the effect of densification on acidic and alkaline pretreatment efficacy. Bulk density and durability of pellets were 724 kg/m(3) and 95%, respectively. Ground switchgrass (D(90) = 21.7 mm) was further ground to a fine power (D(90) = 0.5mm) in the pellet mill prior to densification. This grinding increased enzymatic hydrolyzate glucose yields of non-pretreated materials by 210%. Pelleting had no adverse impact on dilute acid pretreatment efficacy. Grinding and pelleting increased hydrolyzate glucose yields of switchgrass pretreated by soaking in aqueous ammonia (SAA) by 37%. Xylose yields from SAA-pretreated switchgrass pellets were 42% higher than those from the original biomass. Increases in sugar yields from SAA-pretreated pelleted biomass are attributed to grinding and heating of biomass during the pelleting process. Potential transportation, storage, and handling benefits of biomass pelleting may be achieved without negatively affecting the downstream processing steps of pretreatment or enzymatic hydrolysis.
将柳枝稷制成颗粒，以评估致密化对酸性和碱性预处理效果的影响。颗粒的堆密度和耐用性分别为 724kg/m(3)和 95%。在致密化之前，将块状柳枝稷（D(90)=21.7mm）进一步研磨成细粉（D(90)=0.5mm）在颗粒机中。这种研磨将未经预处理材料的酶解葡萄糖产率提高了 210%。制粒对稀酸预处理效果没有不利影响。研磨和制粒使在氨水溶液中浸泡预处理的柳枝稷的水解物葡萄糖产率提高了 37%。与原始生物质相比，来自 SAA 预处理的柳枝稷颗粒的木糖产率高出 42%。SAA 预处理的颗粒状生物质的糖产率增加归因于制粒过程中生物质的研磨和加热。在不影响预处理或酶解的下游加工步骤的情况下，可能实现生物质制粒的潜在运输、储存和处理优势。
