Figure 2.

(a) Evolution in the batch bioreactor of cell density ($♦$), cumulative biohydrogen production ($■$), pH (∆), pO₂ ($●$) and; (b) anion consumption, during the fermentation of 18.5 g/L crude glycerol in bottles (Bottle-batch) and bioreactor (Bioreactor-batch) (2 replicates).