The two 96-h fermentation tests were carried out in two glass
flasks with a working volume of 500 mL, mechanically stirred at
150 rpm, with a pH set at 5.5 corrected automatically by adding
3 mol L1 KOH in a lab-incubator kept at 37 C. The two flasks were
fluxed with N2 and kept closed to maintain anaerobic conditions
inside.