This PDF document is a pre-print version of the manuscript that was subsequently peer-reviewed and accepted for publication by the journal New Biotechnology (Vol. 46, pages 54-60, year 2018), within the Special Issue ICEEM09. The final publication is available at Elsevier via https://doi.org/10.1016/j.nbt.2018.07.002. The present work has been performed as part of the H2020-LCE-2015 Waste2Fuels project (Sustainable production of next generation biofuels from waste streams - Waste2Fuels. GA - 654623), funded by the European Union's Horizon 2020 Research and Innovation Programme. MH-V is supported by a postdoctoral contract (DOC-INIA, grant number DOC 2013-010) funded by the Spanish National Institute for Agricultural and Food Research and Technology (INIA) and the European Social Fund. Authors thank R. Antón del Río, N. del Castillo Ferreras and G. Sarmiento Martínez for their technical help.

Potato peel from a snack factory was successfully used as feedstock for biobutanol production. This lignocellulosic biomass was subjected to various physicochemical pretreatments under different conditions and finally an autohydrolysis pretreatment was selected. The fermentability of the hydrolysates was checked with six Clostridia strains. It was observed that C. saccharobutylicum DSM 13864 produced 2.1 g/L acetone, 7.6 g/L butanol and 0.6 g/L ethanol in 96 h (0.186 gB/gS), whereas C. saccharoperbutylacetonicum DSM 2152 generated 1.8 g/L acetone, 8.1 g/L butanol and 1.0 g/L ethanol in 120 h (0.203 gB/gS). Detoxification steps of the hydrolysate before fermentation were not necessary.