| In a batch reactor, the BrO-3 formation was investigated in the ozonation and catalytic ozonation of Br--containing Yellow river water, using the different heterogeneous catalysts. The results showed that BrO-3 minimization was achieved in the catalytic ozonation with NiO, CuO, Fe3O4 and Al2O3 as catalysts and the percent reductions of BrO-3 were 34.0%, 32.8%, 29.2% and 20.8% respectively. In the reaction Rct, the ratio of concentration of ·OH to O3, decreased with the reaction time, and the range of Rct was from 10-8 to 10-6. In the ozonation process, one of the main reaction pathways of BrO-3 formation was the combination oxidation of Br-by ·OH and then O3, another was the combination oxidation of Br- by O3 and then ·OH. In the catalytic ozonation with Fe3O4 catalyst, the main pathway was the combination oxidation by ·OH and then O3. Moreover, about 60.7% removal for UV254 was obtained after 20 min in the catalytic ozonation reaction. In our study, it was found that the catalytic ozonation process can effectively minimize the formation of BrO-3 and also oxidize organic compounds. |
