Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Effect of Gas Sparging on Sonochemical Oxidation in a 300 kHz Sonoreactor

300 kHz 조건에서의 초음파화학적 산화반응에 대한 연속식 가스 주입 효과

  • Seo, Jieun (Department of Environmental Engineering, Kumoh National Institute of Technology) ;
  • Son, Younggyu (Department of Environmental Engineering, Kumoh National Institute of Technology)
  • 서지은 (국립금오공과대학교 환경공학과) ;
  • 손영규 (국립금오공과대학교 환경공학과)
  • Received : 2018.10.06
  • Accepted : 2018.11.27
  • Published : 2018.11.30
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Abstract

The effect of gas sparging on sonochemical oxidation was investigated in a 300 kHz sonoreactor under various liquid height/volume conditions ($5{\sim}30{\lambda}$, 3.4 ~ 9.0 L), determined by the wavelength of the applied frequency. The electrical input power was maintained constant for all cases . Sonochemical activity drastically decreased from $15{\lambda}$ and the liquid height of $10{\lambda}$ was suggested as the optimal height for 300 kHz without gas sparging. In our previous research, the sonochemical activity observed was five-times higher when air sparging was applied for 36 kHz. On the other hand, no enhancement was obtained at 10, 15, 25 and $30{\lambda}$ using air sparging (1, 3, and 6 L/min) for 300 kHz in this study $20{\lambda}$ and optimization of gas sparging was conducted at $20{\lambda}$ using various gases including air, Ar, $O_2$, $N_2$, and mixtures of Ar and $O_2$. It was found that gas sparging using pure Ar or pure $O_2$ resulted in lower sonochemical activity compared to that of air sparging due to the imbalance between the intensity of cavitation phenomena and the generation of oxidizing radical species. Consequently, the gas mixture of $Ar:O_2$ = 80 % : 20 % (DO saturation ${\approx}100%$) was suggested as an optimal gas sparging condition.

Keywords

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Fig. 1. A schematic diagram of the experimental setup.

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Fig. 2. Concentration and cavitation yield of $I_3^-$ using calo-rimetric power and electrical power at each liquid height.

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Fig. 3. Cavitation yield of $I_3^-$using electrical power for various air sparging flow rates at each liquid height.

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Fig. 4. SCL (Sonochemiluminescence) images for no air sparging and air sparging (flow rate = 3 L/min) conditions at each liquid height (The image of (f) was obtained from Choi et al. (2019)'s work).

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Fig. 5. Cavitation yield of $I_3^-$ using electrical power and DO concentration variations for air, Ar, $O_2$, and $N_2$ saturation and sparging at 20$\lambda$ (DO 100 % = 8.4 mg/L at 25 $^{\circ}C$).

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Fig. 6. Cavitation yield of $I_3^-$ using electrical power and DO concentration variations for various mixtures of Ar and $O_2$ at 20$\lambda$ (Flow rate: 3 L/min; DO 100 % = 8.4 mg/L at 25 $^{\circ}C$).

Table 1. Gas injection conditions in this study

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