[Effect of Fe2+ concentration on kinetics of biohydrogen production].

The effect of Fe2+ concentration ranging from 0 to 1500 mg/L on the kinetics of fermentative hydrogen production by mixed microbial culture was investigated. The results showed that, at 35 degrees C and initial pH 7.0, using glucose as substrate, hydrogen production potential and average hydrogen production rate increased with increasing Fe2+ concentration from 0 to 300 mg/L, with the maximum hydrogen production potential of 302.3 mL and maximum average hydrogen production rate of 30.0 mL/h being obtained at Fe2+ concentration of 300 mg/L. Hydrogen yield increased with increasing Fe2+ concentration from 0 to 350 mg/L, with the maximum hydrogen yield of 311.2 mL/g glucose being obtained at Fe2+ concentration of 350 mg/L. Modified Logistic model could describe the progress of cumulative hydrogen production in the batch tests successfully. Modified Han-Levenspiel model could describe the effect of Fe2+ concentrations on average hydrogen production rate successfully.