RESUMO
Various mixing ratios of alkali pretreated sugarcane bagasse and starch-rich waste Dioscorea composita hemls extracted residue (DER) were evaluated via simultaneous saccharification and fermentation (SSF) with 12% (w/w) solid loading, and the mixture ratio of 1:1 achieved the highest ethanol concentration and yield. When the solid loading was increased from 12% to 32%, the ethanol concentration was increased to 72.04â¯g/L, whereas the ethanol yield was reduced from 84.40% to 73.71%. With batch feeding and the addition of 0.1% (w/v) Tween 80, the final ethanol concentration and yield of SSF at 34% loading were 82.83â¯g/L and 77.22%, respectively. Due to the integration with existing starch-based ethanol industry, the co-fermentation is expected to be a competitive alternative form for cellulosic ethanol production.
Assuntos
Celulose , Dioscorea , Etanol , Saccharum , Fermentação , HidróliseRESUMO
A FeCl3 pretreatment methodology was developed to convert raw sugarcane bagasse to highly digestible pretreated solid and selectively extract up to â¼100% of the hemicellulose from lignocellulosic biomass. FeCl3 pretreated solids yielded a quite high fermentable sugar yield compared to the native material. In addition, characterization of raw material and pretreated solid by X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric (TG) analysis was carried out to better understand how hemicellulose removal affected subsequent enzymatic hydrolysis. Furthermore, the addition of surfactants during enzymatic hydrolysis achieved higher glucose yields. 82.3% of glucose could be obtained with addition of BSA, combined with that generated during pretreatment process, the total glucose yield reached 42.2g/100g raw material, representing 93.8% of glucose in the raw sugarcane bagasse. The FeCl3 process offered the potential to co-produce xylose-derived and glucose-derived chemicals in the bio-refinery.