Application of the Fenton Process for the Removal of Emerging Contaminants in Real Wastewater—A Short Review

Real wastewater contains emerging contaminants that pose problems for flora, fauna, and human health. Conventional wastewater treatment processes, such as the activated sludge process and aerated lagoons, which are commonly used worldwide, cannot remove these contaminants. Therefore, this review analyzes the application of the Fenton process and its variants—homogeneous Fenton, photo-Fenton, Fenton-like, heterogeneous Fenton, and electro-Fenton—to remove various emerging contaminants belonging to different groups, such as pharmaceuticals, personal care products, perfluoroalkyl and polyfluoroalkyl substances (PFASs), etc., from wastewater. The review focuses on the reaction mechanisms, application considerations, parameters, and future perspectives of these processes. The compiled information shows that the Fenton process and most of its variants can successfully remove emerging contaminants from different types of aqueous matrices. However, improvements are still needed in terms of performance and application for treating real wastewater on a macro scale.