<p>The objective of this study was to investigate the photocatalytic treatment of rose</p><p>processing wastewater by using sunlight and TiO2. Rose processing wastewater contains</p><p>high concentrations of chemical oxygen demand, high amount of solid matters and dark</p><p>color. The effect of various operating conditions such as irradiation time, catalyst loading</p><p>and pH on COD and color removal were determined. The highest color removal and COD</p><p>removal was found to be 51.7 % and 15.7%, respectively with 2 g/L TiO2 catalyst dose at</p><p>pH 4. Sunlight was used as an economic irradiation source for photocatalytic treatment of</p><p>rose processing wastewater.</p>