obtained a final ethanol concentration of 82.83 g/L by the co-fermentation of sugarcane bagasse and Dioscorea composita hemls. investigated the influence of starchy substrate addition on cellulosic ethanol production, demonstrating the improvement of the final ethanol concentration from 6.9 to 18.1 g/L. Currently, several methods have been proposed for the integration of grains or sugar juice to enhance the initial sugar concentration and improve the subsequent ethanol production. However, some disadvantages have limited the development of bioethanol production from lignocellulosic biomass, such as high enzyme costs and lower ethanol titers and yields. Lignocellulosic biomass is regarded as a potential material for the production of cellulosic ethanol due to its relatively low cost and because it prevents the diversion of food crops to the production of bioethanol. Integrating sugarcane molasses into sequential cellulosic biofuel production could improve the utilization of biomass resources.īioethanol, as a replacement and additive of gasoline, is a remarkable type of biofuel. Molasses could provide a good environment for the growth of yeast and inoculum. The final methane production of 312.14 mL/g volatile solids (VS) was obtained, and the final chemical oxygen demand removal and VS degradation efficiency was 85.9% and 95.9%, respectively. In addition, after evaporation, the wastewater could be converted to biogas by anaerobic digestion. The highest ethanol concentration of 94.20 g/L was generated at a high solid loading of 44%, with an ethanol yield of 72.37%. To further boost the ethanol concentration, the fermentation of mixture B (1:1), with higher solid loading from 36 to 48%, was also implemented. At a solid loading of 32%, the ethanol concentrations of 64.10 g/L, 74.69 g/L, and 75.64 g/L were obtained from pure SCB, mixture A, and mixture B, respectively. The co-fermentation of pretreated SCB and molasses at ratios of 3:1 (mixture A) and 1:1 (mixture B) were conducted at solid loadings of 12% to 32%, and the fermentation of pretreated SCB alone at the same solid loading was also compared. Herein, to reduce high processing costs, molasses was integrated into lignocellulosic ethanol production in batch modes to improve the fermentation system and to boost the final ethanol concentration and yield. Sugarcane molasses, as a carbohydrate-rich biomass, can provide fermentable sugars for ethanol production. However, bioethanol production from pure SCB fermentation is still limited by its high process cost and low fermentation efficiency. Sugarcane bagasse (SCB) is one of the most promising lignocellulosic biomasses for use in the production of biofuels.
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