Journal
BIORESOURCE TECHNOLOGY
Volume 192, Issue -, Pages 287-295Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.05.012
Keywords
Bio-butanol; Flocculation; Nanofiltration; Phenolics; Wood biomass hydrolysate
Funding
- College-University I2I Program of the Natural Sciences and Engineering Research Council of Canada [437803-12]
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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 0.3 g/L in untreated hydrolysate, to 1.1 g/L in flocculated and in nanofiltrated and flocculated hydrolysates. (C) 2015 Elsevier Ltd. All rights reserved.
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