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Figure5. Kinetics of ozonization and catalytic ozonization for COD reduction. 3.3. Reusability Test
Three rounds of continuous degradation experiments of pulping and papermaking wastewater were set up to test the reusability of TiO 2 /sponge composite materials. At the end of each round of experiments, the gravity sedimentation method was used to separate the composite carrier, and the composite carrier was washed three times with ultra-pure water, and then put into the oven for drying before being used. The results of repeated cycle experiment are shown in Figure 6. The results show that catalyzed ozonation can degrade 52% of COD within 8 min. After three rounds of repeated experiments, THE COD reduction effect decreased slightly, but was basically stable, proving that the TiO 2 /sponge composite carrier has good reusability.
Figure6. Recyclability of the TiO 2 /sponge composite.
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