Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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The Effect of Irradiation Distance/Volume on Sonochemical Oxidation of Arsenite

초음파를 이용한 As(III) 산화 시 조사 거리/부피의 영향

  • Kim, Eunkyung (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Son, Younggyu (Department of Urban Environment, Ulsan Development Institute) ;
  • Cui, Mingcan (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Khim, Jeehyeong (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 김은경 (고려대학교 건축사회환경공학과) ;
  • 손영규 (울산발전연구원 도시환경연구실) ;
  • 최명찬 (고려대학교 건축사회환경공학과) ;
  • 김지형 (고려대학교 건축사회환경공학과)
  • Received : 2012.04.02
  • Accepted : 2012.04.26
  • Published : 2012.04.30
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Abstract

The objective of this study was to find the frequency that most effectively generates hydroxyl radical and to investigate the effect of solution volume on the oxidation of arsenite (As[III]) under the determined frequency. Based on the cavitation yield for hydrogen peroxide, hydroxyl radical is formed most effectively under the frequency of 300 kHz. The experiment was performed with various solution volumes (334, 690, 1,046, and 1,401 mL) under 300 kHz. Results showed that as solution volume increased, kinetic constant for arsenite oxidation decreased. However, cavitation yield for arsenite decreased in small volumes (334, and 690 mL) but maintained or increased in large volumes (1,046, and 1,401 mL) over a set period of time (10, 30, and 60 min). Based on the kinetic constant result, it is more advantageous to oxidize arsenite in small volumes. However, according to the cavitation yield for arsenite, it is applicable to oxidize arsenite in large volumes over a long period of time.

본 연구는 초음파 공정에서 주파수가 OH 라디칼 생성량에 미치는 영향을 알아보고 OH 라디칼의 생성량이 가장 많은 주파수를 이용하여 As(III) 산화 시 부피의 영향에 대해 알아보았다. 35, 300, 500 kHz 세 주파수의 초음파를 조사 시 생성되는 과산화수소를 측정하였을 때 300 kHz에서 과산화수소의 cavitation yield 가 가장 크게 나타났다. 주파수 300 kHz의 초음파를 이용하여 As(III) 용액을 4가지 부피(334, 690, 1,046, 1,401 mL)에 대해 산화시킨 결과, 부피가 증가할수록 반응 속도 상수는 감소하였다. 그러나 As(III)의 cavitation yield는 작은 부피에서는 시간이 지남에 따라 값이 감소하였으나 큰 부피에서는 시간이 지나도 값이 유지되거나 오히려 증가하는 결과를 보였다. 초음파 공정에서 As(III)를 산화시킬 때 짧은 시간 내에 일정 농도 이하가 되기 위해서는 반응 속도 상수 결과에 따라 작은 부피에서 산화시키는 것이 유리하다. 반면에 큰 부피에서 오랫동안 산화시킨다면 As(III)의 cavitation yield 결과에 따라 소비 에너지 대비 많은 양(mass)의 As(III)를 산화시킬 수 있기 때문에 출력밀도가 낮음에도 불구하고 적용 가능성이 높다는 것을 확인하였다.

Keywords

Acknowledgement

Grant : 토양.지하수오염방지기술개발사업

Supported by : 환경부

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