PRODUCTION OF BIOETHANOL FROM SILVER FIR WOOD

The aim of this study was the production of bioethanol from waste wood by autohydrolysis, enzymatic hydrolysis and fermentation with Saccharomyces cerevisiae. The major components of waste wood are cellulose, hemicellulose and lignin. Cellulose and hemicellulose are carbohydrates that were extracted from wood and converted into bioethanol. Autohydrolysis pretreatment was investigated for conversion of hemicellulose in liquid fraction and cellulose and lignin separation in solid fraction, at selected ranges of temperatures (180-200°C) and time (5-15 min). The enzymatic hydrolysis of pretreated material was performed for carbohydrates obtaining. The autohydrolysis pretreatment performed at temperature of 190°C and 10 min gave the best bioethanol concentration (37 g/l).