Advanced oxidation processes (AOPs) are a set of chemical treatment procedures designed for the effective removal of organic pollutants in water and wastewater by the process of oxidation. This emerging chemical technology is based on the in-situ generation of hydroxyl radicals as a powerful oxidant. In some AOPs, sulphate radicals, ozone, catalyst, and UV irradiation are also used to achieve better efficiency in treatment. AOP is beneficial for cleaning biologically toxic or non-degradable materials in wastewater such as aromatics, pesticides, petroleum constituents and volatile organic compounds. A major advantage of AOPs is that these processes do not introduce any new hazardous substances into the water since the complete reduction product of hydroxyl radicals is water. This book provides a detailed explanation of advanced oxidation processes used for treating industrial wastewater. The diverse topics covered herein address the varied processes that fall under this category. The extensive content of this book provides the readers with a thorough understanding of the subject.