| Title |
A Study on Ozonation of Sulfamethoxazole |
| DOI |
https://doi.org/10.15681/KSWE.2019.35.6.459 |
| Keywords |
Activation energy; Advanced oxidation process; Ozonation; Sulfamethoxazole |
| Abstract |
The ozonation of sulfamethoxazole (SMX) was performed at 20℃ using a pilot scale countercurrent bubble column reactor. Ozonation systems were combined with UV irradiation and TiO2 addition. As the oxidation reaction proceeded in each treatment system, the pH of the sample decreased and in the O3/UV/TiO2 system, the pH change was the largest from 4.54 to 2.02. Under these experimental conditions, the scavenger impact of carbonate is negligible. The highest COD and TOC removal rate was observed in the O3/UV/TiO2 system due to the UV irradiation and the photocatalytic effect of TiO2. Also, the highest mineralization ratio(ε) value is 0.2 in the O3/UV/TiO2 system, which means theoxidation capacity of the systems. The highest SMX degradation rate constants calculated by COD and TOC values (COD and TOC) were 2.15 × 10-4 sec-1 and 1.00 × 10-4 sec-1 in the O3/UV/TiO2 system, respectively. The activation energy (Ea) of ozone treatment follows the Arrhenius law. It was calculated based on COD and TOC. Each activation energy decreased in order of single O3> O3/TiO2> O3/UV > O3/UV/TiO2 system. The result showed that ΔH≠ is more effective than ΔS≠ in each SMX ozontaionsystem, that is characteristic of the common oxidation reaction. |