Effect of overliming and activated carbon detoxification on inhibitors removal and butanol fermentation of poplar prehydrolysates

Abstract

The results indicated that the aldehydes and ketones were more inhibitory than the corresponding acids and alcohols.[...]the identification and detoxification of aldehydes and ketones in the prehydrolysates are critically needed in biofuels fermentation.[...]a combination approach is needed to detoxify the prehydrolysates for ABE fermentation.[...]integration of overliming and AC treatment could be more effective to remove both furans and phenolic compounds (aromatic monomers and dimers).According to the HPLC analysis, the prehydrolysates contained glucose (10.85 g L−1), xylose (8.93 g L−1), galactose (1.04 g L−1), arabinose (0.64 g L−1), mannose (1.94 g L−1), and sugar degradation compounds including formic acid (1.15 g L−1), acetic acid (6.08 g L−1), levulinic acid (1.12 g L−1), HMF (0.63 g L−1) and furfural (4.94 g L−1).