Abstract: Triclosan is an important broad spectrum antimicrobial agent which has been incorporated into a variety of personal care products, because of its favourable safety profile. Triclosan is relatively stable and occurs in low concentrations thereby making it difficult to remove or degrade in the natural aquatic environment. Advanced Oxidation Processes (AOPs) have proved to be effective in degradation of triclosan. In this study, a heterogeneous advanced oxidation process (AOP) using TiO2/UV was compared with homogeneous AOP using O3/UV for the removal of triclosan from wastewater. The performance was evaluated in terms of efficiency of removal of triclosan by both the processes. The effect of pH, oxidant dosage and contact time were also considered and favourable reaction conditions were found. Homogeneous AOP (O3/UV) was found to have higher triclosan removal efficiency (>90%) under optimum reaction conditions. It was found that TiO2/UV process required more oxidant dosage and reaction time than the O3/UV process to ensure significant triclosan removal efficiency. However, prolonged irradiation using heterogeneous AOP (TiO2/UV) ensured complete removal of triclosan. Even so, selection of a particular treatment option depends on various factors such as the type of wastewater and potential reuse application of treated wastewater..
Keywords: AOP, O3/UV, TiO2/UV, Triclosan, Wastewater
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