1. ガスリフト式ソノリアクターの開発

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Refractory organic pollutants in aqueous solution are decomposed by ultrasonic irradiation. For the wastewater treatment, the gaslift bubble column sonochemical reactor was proposed and the performance was examined. The bubble column and draft tube were made of transparent acrylic resin and the inside diameter and height of column were 0.100 m and 2.00 m, respectively. The length of draft tube was 1.50 m and inside diameter was 0.055 m. Two ring spargers, which had 8 holes with 0.5 mm in diameter, and the porous sparger, whose pore diameter was 10 μm, were attached at the lower end of draft tube. One was for sparging gas into the draft tube (DT-BC [in]) and the other was for sparging gas into the annulus (DT-BC [an]) between column and draft tube. The planar PZT oscillator was attached at the center of reactor bottom and operated at 85 W. The standard bubble column (SBC) was used to compare with DT-BC. The sample to be decomposed was tetraphenylporphine tetrasulfonic acid aqueous solution. The initial concentration was 3.3×10^<-3> mol/m^3 and the sample volume was 13.5 L. For all modes of sparging gas, the apparent reaction rate constant increases with increasing gas velocity because of the enhancement of liquid mixing. To compare the results, the apparent reaction rate constant was plotted against the liquid mixing time. The liquid mixing time indicates the degree of mixing. Regardless of the modes of sparging gas, the apparent reaction rate constant increases linearly with decreasing liquid mixing time. The dependence of reaction rate constant on liquid mixing time in DT-BC is different from that in SBC. In the case of bubbling by the porous sparger, the apparent reaction rate constant is higher than that for the ring sparger. The sparge of microbubbles in the sonochemical reactor is considered to enhance the generation and collapse of the cavities.
日本ソノケミストリー学会の論文

1. ガスリフト式ソノリアクターの開発

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