Figure 6.

Ethanol yields of GL pretreated with H₂SO₄ and H₃PO₄ 10 g/100 g TS as well as 2 g HCl/100 g TS under different concepts, i.e., using the whole pretreatment slurry and P. stipitis, P. tannophilus and S. cerevisiae (a) at simultaneous saccharification and fermentation (SSF) and (b) separate hydrolysis and fermentation (SHF), or after separation of both fractions, where (c) the hydrolysate was fermented by P. stipitis or P. tannophilus and (d) the solid fraction by S. cerevisiae at SSF or SHF.