Abstract
In the kraft pulping process, the hemicellulose portion of wood is usually discharged as a waste stream into the black liquor, representing a highly underutilized sugar source. In this study, the hemicellulose prehydrolysate is investigated as a liquid sugar source for production of acetone, butanol, and ethanol by ABE fermentation. For this purpose, hot-water treatment is applied to poplar (hardwood) and southern pine (softwood) for hemicellulose extraction. The acquired hemicellulose prehydrolysate was analyzed to contain, in addition to the carbohydrates in the form of oligosaccharides, various degradation compounds. The toxicity test with model compounds indicates phenolic compounds exert tremendous inhibition on the cell growth. Therefore, detoxification is required prior to fermentation. Adsorption with activated carbon is an effective detoxification method greatly reducing the phenolic content and alleviating the phenol-induced inhibition. Upon detoxification, simultaneous saccharification and ferm...
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