An innovative approach was developed by incorporating high-pressure CO₂ into the separate hydrolysis-fermentation of aspen leftover branches, aiming to enhance the bioethanol production efficiency. The high-pressure CO₂ significantly increased the 72-h enzymatic hydrolysis yield of converting aspen into glucose from 53.8% to 82.9%. The hydrolysis process was performed with low enzyme loading (10 FPU g^-1 glucan) with the aim of reducing the cost of fuel bioethanol production. The ethanol yield from fermentation of the hydrolyzed glucose using yeast (Saccharomyces cerevisiae) was 8.7 g L^-1, showing increment of 10% compared with the glucose control. Techno-economic analysis indicated that the energy consumption of fuel bioethanol production from aspen branch chips was reduced by 35% and the production cost was cut 44% to 0.615 USD L^-1, when 68 atm CO₂ was introduced into the process. These results furtherly emphasized the low carbon footprint of this sustainable energy production approach.

• PMID: 32563796
• DOI full text
• PubMed
• PubTator

Reference Type

Journal Article

Authors

Wu Y, Ge S, Xia C, Cai L, Mei C, Sonne C, Park YK, Kim YM, Chen WH, Chang JS, ... Show all

Primary Lit For

Additional Lit For

Review For