Novel treatment for dye decolorization using a microreactor system and Fenton's reagent

Wastewater treatments in the textile industry faces many challenges, particularly due to the residues of used dyes, which are pollutants characterized by high chemical stability. One promising technology for addressing the issue is an advanced oxidation process (AOP), often utilizing Fenton's reagent as the oxidizing component. This study focuses on the degradation of the anthraquinone dye Acid Violet 109 using Fenton's reagent in a microfluidic reactor. The microreactor system consists of plunger pump units, a mixer, and a polytetrafluoroethylene (PTFE) tube. The influences of various process parameters have been analyzed, including the concentration of Fe2+, microreactor characteristics, the Fe2+/H2O2 molar ratio, and the total flow rate of the reaction mixture. The results show that treatment with Fenton's reagent is successful, with efficiencies between 82 and 99 %.