Removal of azo and anthraquinone dye from textile wastewater using ozone-based advanced oxidation processes

Ozonation (OJ) and advanced oxidation processes (AOPs) involving ozone in combination with persulphate (OJIS2082-) has been considered as an emerging technology to treat dyes and dyestuff industrial effluents. However, the performance of dye removal remains unclear. Therefore, this research aim to evaluate the performance of two treatment methods by employing OJ and OJ/S2082- for synthetic dye wastewater, consist of azo Reactive Red 120 (RR120) and anthraquinone Reactive Blue 19 (RB 19). The main objective of the research are to compare the performance of 0 3 and 0 3/S2082-processes for colour, and chemical oxygen demand (COD) removal for two different types of dye. The experiments of 0 3 and OJIS2082- process were conducted in a semibatch reactor originated from cylindrical glass reactor. For better understanding of the treatments, the research focused on the most significant parameter that govern the treatments such as initial dye concentration, contact time, pH and S2082- dosage. Furthermore, the performance is compared by evaluating the key parameters such as colour and COD. The degradation and oxidation products are characterized based on the change in ultraviolet-visible (UV-Vis) and Fourier transforms-infrared (FT-IR) spectra. In addition, the optimization of process parameters was performed by Design Expert 7.1 Software. This study has found that, the OJ/S2082- advanced oxidation treatment provides good performances in the colour removal of the RR120 in water. The change in the UV-Vis and FT-IR spectra indicated the cleavage of the dye structure and formation of intermediates. The initial S2082- dosage, dye concentration and pH play an important role in the generation of hydroxyl and sulphate radicals for the dye degradation. The results of this investigation show that, the decolourisation was strongly depending on initial S2082 dosage. The decolourisation efficiency increased with increasing S2082- dosage and reaction time. While, decolourisation efficiency decreased with raising the initial dye concentration.