Monday, May 5, 2008
8-14

Optimization of Pre-Treatment for Ethanol Production from Post-Harvest Sugarcane Residue

Raj Boopathy, Biological Sciences, Nicholls State University, Hwy 1, Thibodaux, LA 70310

Sugar production is a major industry in Louisiana. In 2004, 804 producers from 23 parishes produced just over 1.2 million tons of sugar. One problem sugarcane farmers face is the post-harvest sugarcane residue in the form of leaf litter that is left after harvesting. At 3 to 10 tons residue per acre, it is a major impediment to farming practices. Currently farmers use open-air burning techniques to get rid of the residue. The open-air burning accounts for up to 21% of total air pollution in Louisiana, which is known to cause public health problems such as asthma and emphysema. Farmers are now under increasing pressure to find alternatives to open air burning. Research at Nicholls State University explores the possibilities of making alcohol from the sugarcane residue. A chemical pre-treatment process using alkaline peroxide was applied to remove lignin, which acts as physical barrier to cellulolytic enzymes. Two yeast strains including Saccharomyces cerevisiae ATCC strains 765 and 918 were used in the experiment. The pre-treatment process effectively removed lignin. Alcohol production in the culture sample was monitored using gas chromatography. The results indicate that ethanol can be made from the sugarcane residue. The fermentation system needs to be optimized for evaluating the economics of producing ethanol from the sugarcane residue.