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Effect of thermal (TT) at 120 °C (1 h) or 80 °C (24 h), acid (H2SO4, H3PO4 and HCl) and alkali (NaOH) pretreatment on (a) hydrogen yields and (b) volatile fatty acids (VFAs—acetic, propionic and butyric acid) produced in biological hydrogen (BHP) experiments using the whole pretreatment slurry, at simultaneous saccharification and fermentation (SSF).
