We examined the effects of power and treatment time on the ultrasonically enhanced ozonation of carbazole dissolved in APG(1214) surfactant solutions, including an analysis of the mechanism of center dot OH radical formation, the zeta potential of the colloidal suspension, the influence of ultrasound on micellar morphology, and the degradation kinetics for carbazole and APG(1214). A 30 min ultrasound treatment at 28 kHz and 20 W improved the degradation of carbazole by 5-10%. while power levels of 40 W and 80 W provided improvements only during the first 5 min and resulted in reduced degradation after 15 min. The center dot OH concentration was inversely proportional to ultrasound power, and directly proportional to the irradiation time. The absolute value of the APG(1214) micelle zeta potential was inversely proportional to power and decreased with increasing irradiation time. The relationships of center dot OH radical concentration in APG(1214) micelles, the zeta potential, and the micellar dynamic radius (R-h) to ultrasonic power and time are the key factors affecting carbazole degradation in this system. 2012 Elsevier B.V. All rights reserved.