Abstract
The performance of Fenton oxidation processes with simultaneous application of two oxidants including (H2O2) and sodium persulfate (Na2S2O8), in the presence of iron (Fe2+) as a catalyst to oxide dinitrotoluene (DNT) was investigated. For optimization of processes, the effect of operational parameters such as solution pH, oxidant dosages, reaction time and initial DNT concentrations on their performance was evaluated. All experiments were conducted at room temperature (25 ± 2 °C). For all studied processes, the efficiency of pollutant removal was enhanced by increasing the oxidant dosages, while it witnessed a reduction with increasing the initial DNT concentration. The results showed that Fe2+/H2O2/Na2S2O8 system was more efficient in alkaline conditions and the oxidizing of DNT followed pseudo-first-order kinetics. At optimum conditions, the mineralization degree was higher than 86%. Moreover, high potential of DNT removal in a petrochemical effluent sample was observed. Fenton process in the presence of simultaneous application of Na2S2O8 and H2O2 can be used as an effective and promising method for petrochemical wastewaters treatment, due to high efficiency in contaminants removal and also high potential of mineralization.
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