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The present study evaluates the potential of dried coffee pulp for bioethanol production and upgrading the quality of the produced ethanol by using a pervaporation membrane. Coffee pulp was ground and pretreated with different concentrations of diluted H2SO4 (0, 1, 2, 3, 4, 5 and 10 vol %) at different solid:
liquid ratios (1:1, 1:2, and 1:4). The neutralized hydrolysate was fermented using lignocellulosic yeast GSE16-T18 strain using a solid to liquid ratio of 1:2. Before fermentation of the hydrolysate with the lignocellulosic yeast, the enzyme accellerase was used for hydrolysis. The fermented feed solution was filtered and pervaporated at different temperatures (30, 40, 50 and 60 °C) using the PolyAn POL_AL_M1 pervaporation membrane. The optimum ethanol yield (7.03 ± 2.63 g/l) was obtained after 12 h of fermentation with lignocellulosic yeast GSE16-T18 strain. Furthermore, pervaporation of the fermented feed concentrated the ethanol to 15.47 ± 0.66 g/l indicating that dried coffee pulp can be a suitable candidate for the production of bioethanol.
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