Abstract
The photochemical decolorization of coffee effluent has been examined by photo-Fenton (UV/Fe 2+/H 2O 2) process. Effects of UV light intensity, initial coffee concentration, iron dose and H 2O 2 dose on the color removal of model coffee effluent have been investigated. The rate of decolorization increased with decreasing initial coffee effluent concentration. It was found that the Fe ion dose and UV light intensity enhanced the decolorization rate. The decolorization process of coffee effluent could be divided into three established phases. At the beginning of the photo-Fenton process, the instantaneous and significant increase in color of the solution was found (Phase-I). In the subsequent phase (Phase-II), the decolorization rate was initially fast and subsequently decreased. In Phase-III, the rate was accelerated and then the complete decolorization of model coffee effluent was achieved. In order to elucidate the mechanisms of coffee effluent color removal process, the concentration changes in Fe 3+ and Fe 2+ besides H 2O 2 were measured during the course of the photo-Fenton process. The rate-determining step in Phase-II was the photo-Fenton reaction or photoreduction of Fe 3+. On the other hand, the decolorization process in Phase-III was highly affected by Fenton reaction or decomposition of H 2O 2 with Fe 2+. About 93% mineralization of 250 mg L −1 model coffee effluent was achieved after 250 min. A comparative study for TiO 2, ZnO and photo-Fenton oxidation processes has been also carried out and the photo-Fenton process was found to be the most effective for color removal of coffee effluent.
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