Oxidation of phenol in a bioremediation medium using Fenton's reagent

摘要

The oxidation of phenol by Fenton's reagent was investigated in a medium suitable for bioremediation. An experimental design approach, based on a central composite rotatable design, was used to quantify the effects of H_2O_2 concentration (2000 to 5000 mg l~(-1)) and FeSO_4.7H_2O concentration (500 to 2000 mg l~(-1)). Performance of the chemical oxidation by Fenton's reagent was evaluated by determining the percentage of phenol oxidized at equilibrium. The analysis of variance test indicated that both H_2O_2 and FeSO_4.7H_2O concentrations had a positive effect on phenol oxidation. Hydrogen peroxide concentration was the dominating parameter for the removal of phenol by Fenton's reagent. The optimal concentrations of H_2O_2 and FeSO_4.7H_2O for complete oxidation of 2000 rng l~(-1) phenol in the medium were found to be 4340 mg l~(-1) and 1616 mg l~(-1), respectively, at 25℃ and pH 3. Oxidation of phenol in the culture medium was found to be significantly different than in pure water.