This conference is the first-ever joint conference of the International Water Association and the International Ozone Association aimed at the exchange and the discussion of the latest information on Advanced Oxidation Processes (AOPs) in the field of water, wastewater and groundwater. AOPs are progressing rapidly all over the world as they have proved to be successful in meeting increasingly stringent global regulations as well as protecting public health and the environment. Thus AOPs are strong alternatives to conventional treatment techniques in many applications for complete elimination of recalcitrant compounds in water and to improve the biodegradation of wastewaters by partial oxidation.