Improvement of butanol production from a hardwood hemicelluloses hydrolysate by combined sugar concentration and phenols removal.
The feasibility of using hardwood hemicellulosic pre-hydrolysate recovered from a dissolving pulping process for Acetone-Butanol-Ethanol (ABE) fermentation has been investigated. Dilutions and detoxification methods based on flocculation and nanofiltration were tested to determine the inhibitory concentration of phenolic compounds and to evaluate the efficiency of inhibitors removal on fermentation. Flocculation carried out with ferric sulfate was the most effective method for removal of phenolics (56%) and acetic acid (80%). The impact on fermentation was significant, with an ABE production of 6.40 g/L and 4.25 g/L when using flocculation or combined nanofiltration/flocculation respectively, as compared to a non-significant production for the untreated hydrolysate. By decreasing the toxicity effect of inhibitors, this study reports for the first time that the use of these techniques is efficient to increase the inhibitory concentration threshold of phenols, from 0.3g/L in untreated hydrolysate, to 1.1g/L in flocculated and in nanofiltrated and flocculated hydrolysates.
['Mechmech|Fatma|F|', 'Chadjaa|Hassan|H|', 'Rahni|Mohamed|M|', 'Marinova|Mariya|M|', 'Ben Akacha|Najla|N|', 'Gargouri|Mohamed|M|']
D019342:Acetic Acid D000096:Acetone D000440:Butanols D002241:Carbohydrates D000431:Ethanol D005285:Fermentation D005290:Ferric Compounds D006868:Hydrolysis D010636:Phenols D011134:Polysaccharides D014934:Wood
Phenolics Flocculation Nanofiltration Bio-butanol Wood biomass hydrolysate