Purification of Wastewater Using Chemical Oxidation Based on Hydroxyl Radicals

Abstract

This paper reviews advanced oxidation processes (AOP) such as Fenton and Fenton-like reactions, photo-assisted Fenton processes, photocatalysis and photolysis. All AOP are characterised by participation of highly reactive ^•OH radicals, which are useful in degradation of organic pollutants. Organic radicals are generated by photolysis of organic matrix or by reaction with ^•OH. The radical intermediates subsequently react with dissolved oxygen affording peroxy radicals and peroxides, which accelerate the overall degradation process, and lead to total mineralization.