Advanced photooxidation is an emerging, novel technology where aqueous organic waste compounds are mineralized by using H2O2 or O-3 Or a combination of the two oxidants in the presence of UV radiation A detailed review of the published information on the mechanism and kinetics of the free radical initiated mineralization process for the three main categories of advanced photooxidation reactions, namely, UV/H2O2, UV/O-3 and UV/H2O2 and O-3 have been discussed. Scale-up parameters, design considerations and economic aspects of full-scale advanced photooxidation reactors for mineralization of pollutants commonly present in industrial effluents are also discussed in the text.