Abstract: The ozonation of A254 and DOC in biotreated textile effluents at various water temperatures was studied in this paper. Evolution of apparent firstorder rate coefficient k(t) was analyzed in terms of nonlinear model. Results showed that k(t) of A254 and DOC, which decreased with reaction time entirely, varied from (0063 5±0031 6) min-1 to (0089 5±0044 1) min-1 and from (0011 0±0005 7) min-1 to (0020 9±0002 9) min-1 during 60 min, respectively, when water temperature is at 280-313 K. Furthermore, the effect of temperature on DOC removal was more significant, since mean activation energy of the former was twice as much as A254. And high dissolved ozone concentration appeared to enhance k(t) of DOC at 280 K in the initial stage of ozonation.