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