Fig. 2

Batch fermentation by Z. mobilis at 30 °C and pH 6.0. Growth of the strains (Gray line) in a rich medium (RM) and b biogas slurry medium. The consumed glucose (Blue line) and produced ethanol (Orange line) during fermentation in c RM and d biogas slurry medium are shown. The Z. mobilis strains were as follows: ZM4 (Square), D95 (Diamond), S912 (Up-triangle). Biogas slurry was sterilized using a 0.22 μm filter membrane. The 10% (v/v) inoculum cells were used for all fermentations. All fermentations were conducted in 150-mL flask contains 100 mL medium with 50 g/L glucose. All fermentations were carried out in triplicate. Error bars show standard deviation (n = 3)