When Kraft E(1) and textile effluents are illuminated with UV light in the presence of polyaniline, the color fades gradually until decolorization ratios of over 80% are attained for a single step of irradiation (1 hour). A chemometrics study show very little influence of pH, mass of polyaniline and presence of oxygen on the efficiency of this process. Complementary experiments indicated that the great intensity of preliminary adsorption of chromophores prevent the subsequent photocataytic destruction when UV light is used.