The substrate was either a synthetic mix simulating a cellulose fermentation effluent from Clostridium thermocellum (Table 3.1): 1.56 g/L acetic acid, 0.64 g/L ethanol, 0.66 g/L succinic acid, 0.16 g/L lactic acid, and 0.03 g/L formic acid (which will be referred to as synthetic fermentation effluent in the rest of this thesis) or one of the following pure substrates: acetic acid (1 g/L), lactic acid (1 g/L), formic acid (1 g/L), succinic acid (1 g/L) or ethanol (1 g/L).