Advanced Oxidation Processes Based Emerging Technologies for Dye Wastewater Treatment

Currently, the issue of minimizing the environmental impact of anthropogenic activities and improving the quality of water resources is topical. The paper presents an overview of research on advanced oxidation processes and their use for the removal of organic dyes from wastewater. Among wastewater treatment technologies based on advanced oxidation processes can be divided: oxidation of organic dyes with hydrogen peroxide in the presence of iron(II) ions when irradiated UV light (photo-Fenton), exposure of wastewater to ultrasound in the presence of iron(II) ions and hydrogen peroxide (sono-Fenton), the photoelectrochemical generation of hydrogen peroxide in the presence of iron(II) ions and UV light irradiation (photoelectro-Fenton), as well as in the presence of heterogeneous iron-containing compounds and hydrogen peroxide (Fenton-like process). These advanced oxidation processes are used for the removal of organic dyes which are highly chemically stable because the other treatment methods, such as biological oxidation is inefficient.