Livestock activities, in addition to using large volumes of water generate a high load of pollutants, especially of organic type, which arrive directly at natural water sources altering their quality. Due to the above, the aim of the following research was to find the optimal operating conditions of a heterogeneous photocatalysis system with TiO2 mediated with sunlight for the treatment of wastewater from the cattle bath; For this purpose, two pH levels (5.0 and 7.0) and two levels of TiO2 concentration (0.4 and 0.6 g/L) were specified. In each treatment, 40 L of the wastewater was recirculated in a solar composite parabolic collector for 240 minutes. The efficiency of the system and the kinetics of degradation were determined in terms of chemical oxygen demand (COD). The COD removals in the treatments were greater than 50 %, while the Taguchi experimental design and the best signal/noise ratio (RS/R) showed that the optimal operating conditions are obtained for a pH equal to 5.0 and a concentration of TiO2 of 0.6 g/L reaching removals of 83.2%. The degradation kinetics was of first order with higher reaction rates for the highest amounts of accumulated UV (> 142.9 W h/m2). Therefore, heterogeneous photocatalysis with TiO2 mediated by sunlight turns out to be a viable treatment for the removal of organic pollutants in effluents affected by the development of livestock activities.