Pretreatment Technology for Saccharification by Fermentation of Cassava Straw
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Abstract:
The technology for hydrolysis and saccharification of cassava straw, a kind of agricultural waste, was investigated in this paper for making full use of biomass resources. The effects of conventional alkali treatment, microwave/alkali treatment and ultrasonic/alkali treatment on the pretreatment of cassava straw were studied first by using the cellulose content as an index. The results showed that the cassava straw, obtained by the treatment of 2%（m/m）NaOH solution and microwave for 40 min, had the highest cellulose content (54.1%) and weight loss (61.3%). This was because that the microwave radiation increased the solubility of hemicellulose in alkali solution, which removed the hemicellulose and increased the cellulose content. Then, the cassava straw, obtained by three pretreatment methods, was fermented for saccharification, and results showed that the substrates, obtained after microwave/alkali treatment, would have the highest content of reducing sugar with the treatment of degradation by Trichoderma viride. Consequently, microwave/alkali treatment was an ideal pretreatment method for the pre-saccharification of cassava straw, which was beneficial to the fermentation of cassava straw in the furture.
