Many synthetic food dyes and their by-products, such as aromatic amines and phenolic compounds,
occurring in industrial wastewater, are toxic to aquatic environment and, because of their carcinogenic and
mutagenic nature, they result in a risk for the environment and human health when wastewater is reused or
released into environment. Therefore, an effective wastewater treatment is required before effluent possible
reuse or disposal. In the last years, advanced oxidation processes (AOPs) have been successfully investigated
in the removal of a wide range of organic and inorganic contaminants from water and wastewater because of
their capacity to promote the formation of highly reactive radicals (especially hydroxyl radicals). However,
most of the studies available in scientific literature have been focused on the application of AOPs in the
degradation of organic dyes from textile industries rather than food dyes. Therefore, while the literature about
dye treatment by AOPs in textile wastewater is consolidated, less information is available for food dyes.
Accordingly, this manuscript summarizes the main results related to the removal of food dyes by AOPs. In
particular, conventional methods (biological and adsorption processes) are shortly introduced before to focus
this mini-review on consolidated (namely, ozonation and homogeneous Fenton/photo-Fenton) and new
(namely heterogeneous photocatalytic processes) AOPs.