Fig. 3.

Comparison of the experimental ($\_$e) and model ($\_$m) results of the steady-state production rates of the fermentation products in co-culture under CO/H₂ and CO/AC (acetate) conditions. X axis represents the H₂ and acetate feed rate, respectively. Y axis represents the steady-state production rates of acetate and the secondary y axis represents the steady-state production rate of ethanol, butyrate and hexanoate by the co-culture. In CO/H₂ experiments, CO feed rate = 4.8 mmol l⁻¹ h⁻¹; growth rate = 0.021 h⁻¹ and working volume = 1 l. In CO/AC conditions, CO feed rate = 6.4 mmol l⁻¹ h⁻¹; growth rate = 0.028 h⁻¹ and working volume = 0.75 l. Feed rates of substrates and production rates are expressed in mmol l⁻¹ h⁻¹.