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      저자 : GAO QIONG YUAN (검색결과 1 건)

      • Ultrasonically Enhanced Ozonation of Phenol in Aqueous Phase

        GAO QIONG YUAN 고려대학교 2008 국내석사

        RANK : 233023

        This study investigates the effect of ultrasound on the ozonation of phenol in aqueous phase according to different input ozone concentrations. Experiments were conducted in both batch system and semi-batch system with ozone concentrations of 20mg/L, 39.1mg/L and 60.4mg/L. Both in batch and semi-batch system, ozonation was observed to be prior for phenol degradation than sonication. In batch system, about 30~50% of phenol was destructed by ozonation while only 8% of phenol was degraded under sonication. More degradation was observed in semi-batch system. Enhancement effect was found in these two systems. More than 60% destruction was observed in combination. Results of the study showed that 39.1mg/L was the optimum value. This indicated that continuing to raise the ozone feed does not necessarily enhance degradation. While a high ozone concentration could facilitate high ozone solubility, as the aqueous ozone concentration exceeded its maximum value, there would be a diminished effect occurs. Moreover, it was found that the reaction had ended within 5 mins. In addition, the effect of flow rates was also investigated by keeping the same input ozone concentration in batch system. Results showed that ozonation did not change much while reducing the flow rate. However, increasing enhancement was observed under the lower flow rate. It indicated that the ultrasonic effect had some relationship with flow rate. This study investigates the effect of ultrasound on the ozonation of phenol in aqueous phase according to different input ozone concentrations. Experiments were conducted in both batch system and semi-batch system with ozone concentrations of 20mg/L, 39.1mg/L and 60.4mg/L. Both in batch and semi-batch system, ozonation was observed to be prior for phenol degradation than sonication. In batch system, about 30~50% of phenol was destructed by ozonation while only 8% of phenol was degraded under sonication. More degradation was observed in semi-batch system. Enhancement effect was found in these two systems. More than 60% destruction was observed in combination. Results of the study showed that 39.1mg/L was the optimum value. This indicated that continuing to raise the ozone feed does not necessarily enhance degradation. While a high ozone concentration could facilitate high ozone solubility, as the aqueous ozone concentration exceeded its maximum value, there would be a diminished effect occurs. Moreover, it was found that the reaction had ended within 5 mins. In addition, the effect of flow rates was also investigated by keeping the same input ozone concentration in batch system. Results showed that ozonation did not change much while reducing the flow rate. However, increasing enhancement was observed under the lower flow rate. It indicated that the ultrasonic effect had some relationship with flow rate.

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