Effect of torrefaction pretreatment for ethanol fermentation from sugarcane bagasse
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Abstract
Torrefaction is an appropriate pre-treatment technique to enhance the pore structure of lignocellulosic material for accelerating enzymatic reaction and subsequent ethanol production. This research aimed to study the effect of torrefaction pretreatment of sugarcane bagasse (SCB) derived from sugarcane juice squeezing on ethanol fermentation by the thermotolerant yeast Kluyveromyces marxianus in Semi-Simultaneous Saccharification and Fermentation (SSSF). The study examined the effect of different torrefaction times (10-60 min), temperatures (120-220°C), SCB particle sizes (0.3-2.0 mm and <0.3 mm) and initial solid loading (30 g/L and 100 g/L) to the fermentation and on the efficiency of ethanol production. The results showed that all the studied parameters affect and exhibit interaction with the ethanol yield. The higher torrefaction temperatures and time may lead to a higher ethanol production yield. However, the torrefaction at temperatures higher than 180°C and longer than 30 min, in which the inhibitors could also be produced, is not suggested due to the drop in ethanol yield observed. The highest ethanol global yield of 26.24% was obtained from the condition of 30 g/L solid loading of 0.3-2.0 mm SCB particle size torrefied at 180°C for 10 min corresponded to 23.95% ethanol global yield. The yield increased when compared with the non-torrefied SCB. This research reveals the feasibility of applying torrefaction pre-treatment to the SCB bio-refinery with the Eco-Efficiency concept.
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