Abstract
Tobacco stalks, one kind of the wastes of tobacco industry, are used as raw material to produce saccharide and ethanol by biorefining technology. Moreover, two chemical pretreatment methods for the biorefinery processes are evaluated. It was found that the reduced sugar yield of tobacco stalks by enzymatic hydrolysis was 345.1 mg/g, which increased 165.7% after 60 min of pretreatment with 2% NaOH at 90 °C. The sugars in hydrolysates mainly consist of glucose and xylose. Under the same pretreatment conditions, the pretreated tobacco stalks could yield 106.6 mg/g of sugar by simultaneous saccharification and ethanol fermentation, and the ethanol yield increased 138.0% in comparison with that of raw tobacco stalk. These results may open a novel avenue to realize the resource utilization of tobacco waste.
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