Advanced oxidation process for treatment of water containing mixture of Acid Red 17, Acid Yellow 11, Direct Yellow 12, Direct Blue 86 and Mordant Violet 40 dyes

Abstract

The removal of dyes from wastewater is one of the biggest problems in the textile industry for both environment and manufacturers. This study examined the possibility of applying ozone (O3) and O3 in combination with ultraviolet (UV) to treat a mixture of synthetic wastewater containing five different dyes (Acid Red 17, Acid Yellow 11, Direct Yellow 12, Direct Blue 86 and Mordant Violet 40) for the decolorization efficiency of dyes with different chromophore and anchor groups. The contact time was studied in a batch reactor under the flow of O3 or O3 combined with UV to achieve optimal operating conditions. The results showed that the application of O3 was more effective than UV-assisted ozonation. The advanced oxidation of each dye in this mixture was compared with the removal of the same dye in the solution separately. The results proved that there is only a slight difference in the time required to remove the dye from the mixture and the single dye in the water solution.