Generally, conventional water treatment approaches are effective at removing contaminants of emerging concern (CEC) satisfactorily; however, these can sometimes be chemically, energetically, and operationally intensive. In this context, advanced oxidation processes (AOPs) have emerged as sustainable technologies for stopping pollutants from reaching the environment, offering different solutions to many environmental problems.In this book, we present recent developments in AOP technology for treating CECs, including the use of AOPs for the treatment of antibiotics, pharmaceuticals and personal care products, and other organic pollutants. The chapters cover a range of AOP technologies, including photocatalysis, electrochemical oxidation, catalyst, persulfate oxidation, and air plasma.This book highlights the potential of AOPs for treating CECs as well as the importance of considering real water matrices, including palm oil mill effluent waste activated sludge, wastewater treatment plants, and pharmaceutical wastewater, in developing and optimizing AOPs for the treatment of CECs.In Focus a book series that showcases the latest accomplishments in water research. Each book focuses on a specialist area with papers from top experts in the field. It aims to be a vehicle for in-depth understanding and inspire further conversations in the sector.