Treatment of Remazol Brilliant Blue Dye Effluent by Advanced Photo Oxidation Process in TiO2/UV and H2O2/UV reactors

Advanced oxidation processes involving TiO₂/UV and H₂O₂/UV were evaluated for their potential use in decolorization of textile dye effluents. A coil photo reactor, consisting of UV radiation source and a spiral coil coated with TiO₂, was used to treat synthetic effluent of Remazol Brilliant Blue dye. The TiO₂ coating was performed using the sol-gel technique. The effects of UV radiation, TiO₂ coatings and dye concentration were studied and the results were compared to dye treatment involving H₂O₂. The maximum dye removal efficiencies were 7.3, 12.2 and 12.5 % for uncoated, single coat and dual coat of TiO₂, respectively. The decolorization efficiency was inversely related to dye concentration of the effluent. The treatments with UV only, TiO₂ only, UV+TiO₂, H₂O₂ only and UV+H₂O₂ resulted in color reduction of 7.6, 2.3, 12.5, 4.1 and 99.9 % respectively. The maximum decolorization occurred in ≤ 100 min in all cases. The temperature varied from 29.2 to 54.7°C for UV+TiO₂ treatment and no change in reactor temperature was observed when UV was not used.