Figure 4From: Optimization of key factors affecting hydrogen production from sugarcane bagasse by a thermophilic anaerobic pure cultureDifferent plots of quadratic model of the effects of acid concentration and reaction time on the H 2 production. (a) two-dimensional contour plot and (b) three-dimensional diagram. The predicted optimum hydrogen production using sugarcane bagasse as the substrate was found at 2.3% H2SO4 and 114.2 min.Back to article page