Solar photocatalytic water mineralization using the interaction between ultraviolet radiation and titanium dioxide (TiO 2 ) has a strong potential for the destruction of toxic organics in water, as widely demonstrated in recent years. Testing of several real waste-water samples at the Plataforma Solar de Almeria (PSA) has proven the feasibility of solar photocatalytic detoxification for the treatment of industrial effluents with organic loads of hundreds of mg/dm 3 . The use of peroxydisulfate (S 2 O - 2 8 ) as an additional oxidant (electron scavenger) has an outstanding effect, producing an important increase in the degradation rate. This oxidant has also been more efficient than hydrogen peroxide (H 2 O 2 ) in the treatment of waste water. A comparison between two different surface-area TiO 2 powders showed no significant differences. Two types of solar collectors, a two-axis parabolic trough system and a compound parabolic concentrating (CPC) system, have been compared, the latter having the best performance for the selected experimental site (latitude+37°, semi-arid climate).