Abstract
Among the Advanced Oxidative Processes (AOPs) applied in the degradation of toxic and resistant organic compounds such as dyes, the heterogeneous photo-Fenton process stands out, once it has high discoloration efficiency and operational simplicity. Given that, this study evaluated the efficiency of the heterogeneous photo-Fenton process in real textile wastewater treatment using chitosan beads as a solid catalyst. Laboratory-scale beads production and tests were carried out to monitor a photochemical reactor equipped with a mercury bulb of 125 W. Samples were collected at different reaction times, equal to 15, 30, 45, 60, 75, 90, and 105 min. The H2O2 concentration applied was 400 mg L−1. The chitosan beads weighed 2 g and were coated with iron, presenting an average diameter of approximately 4 mm. The results presented 91.92 % of effluent discoloration. It was possible to verify the process efficiency without iron precipitation when working with pH values above 6. Furthermore, the determination of other parameters behaviors, such as color, aromatic compounds, dissolved and total solids, as well as toxicity, was accomplished.
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