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Methods for Facilitating Microbial Growth on Pulp Mill Waste Streams and Characterization of the Biodegradation Potential of Cultured Microbes

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Cellulose conversion in dry grind ethanol plants.

Michael Ladisch¹, Bruce Dale, Wally Tyner

¹Laboratory of Renewable Resources Engineering, Purdue University, West Lafayette, IN 47907, USA. carie@purdue.edu

Bioresource Technology

|April 22, 2008

Summary

Integrating cellulose conversion technology into dry grind ethanol plants can boost ethanol yields by 14% and improve distiller's grains. This process enhances economic viability for the expanding bioethanol industry.

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Area of Science:

Biotechnology
Chemical Engineering
Agricultural Science

Background:

The dry grind process is the dominant method for producing fuel ethanol from corn.
Opportunities exist to enhance the efficiency and value of existing ethanol production facilities.
Cellulose conversion offers a pathway to increase ethanol yield and improve co-product quality.

Purpose of the Study:

To evaluate the integration of cellulose conversion technology into existing dry grind ethanol plants.
To compare the conventional dry grind process with a modified process including cellulose pretreatment and hydrolysis.
To assess the impact on ethanol yield, distiller's grains composition, and overall economic performance.

Main Methods:

Laboratory experiments were conducted to gather data on cellulose conversion.
Compositional analysis of distiller's grains was performed.
Process simulations were utilized for comparative analysis and economic projections.
Key technologies include cellulose pretreatment, enzyme hydrolysis, fermentation, and drying.

Main Results:

Ethanol yields can be enhanced by up to 14% through cellulose conversion.
The volume of distiller's grains is decreased, while protein content is increased.
Process modifications are projected to yield a 32% increase in net present value for a 100 million gallon/year plant.

Conclusions:

Integrating cellulose conversion technology is a viable strategy for improving dry grind ethanol production.
The enhanced process offers significant economic benefits and improves the quality of co-products.
This approach presents a valuable opportunity for the expanding bioethanol industry.