Figure 7From: Revealing the factors influencing a fermentative biohydrogen production process using industrial wastewater as fermentation substrateConfirmation of the predicted stationary point for the investigated system. The mean of the maximum biohydrogen production yield of 28 mL measured at the end of the confirmation experiments is within the ±95% confidence interval for the predicted optimum area. *The microbial population used as a starting inoculum during the wastewater degradation experiments was subjected to heat pretreatment prior to the inoculation.Back to article page