A modified method for calculating practical ethanol yield at high lignocellulosic solids content and high ethanol...

Area of Science:

• Biotechnology
• Biochemical Engineering
• Renewable Energy

Background:

• Simultaneous saccharification and fermentation (SSF) is key for biofuel production.
• Accurate ethanol yield calculation is vital for process optimization, especially at high solids and titers.
• Conventional methods may not account for dynamic volume changes in SSF.

Purpose of the Study:

• To develop and validate a modified method for calculating practical ethanol yield in high-solids, high-titer SSF.
• To compare the accuracy of the modified method against the conventional approach.
• To quantify volume changes during SSF due to ethanol production and water consumption.

Main Methods:

• A modified calculation method was developed considering liquid volume changes from ethanol generation and water consumption.
• The modified method was applied to practical SSF operations.
• Results were compared with those obtained using the conventional calculation method.

Main Results:

• The liquid volume increase from ethanol formation was approximately five times greater than the volume decrease from cellulose degradation.
• Conventional methods underestimated practical ethanol yields.
• Underestimation errors increased with higher ethanol titers.

Conclusions:

• The modified method provides a more accurate assessment of ethanol yield in high-solids, high-titer SSF.
• This accurate yield calculation is essential for optimizing biofuel production processes.
• The proposed method offers a convenient and accurate tool for industrial applications.