Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Removal of Chloramphenicol, Salicylic Acid and Ketoprofen using Various Oxidation Processes : Oxidation Kinetic Evaluation

다양한 산화공정을 이용한 수중의 Chloramphenicol, Salicylic Acid 및 Ketoprofen 의약물질 제거 : 산화 동력학 평가

  • 손희종 (부산광역시 상수도사업본부 수질연구소)
  • Received : 2009.03.04
  • Accepted : 2010.01.25
  • Published : 2010.02.28
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Abstract

In order to evaluate a removal characteristic of chloramphenicol, salicylic acid and ketoprofen according to dose of oxidants, $Cl_2$, $O_3$ and $O_3/H_2O_2$ are used as oxidants in this study. In case of that $Cl_2$ is used for oxidizing harmaceuticals, chloramphenicol, salicylic acid and ketoprofen is not removed entirely at $Cl_2$ dose rang of 0.5~5.0 mg/L for 60 min. However, removal tendency of salicylic acid is so obviously at $Cl_2$ dose higher than 1.0 mg/L. In addition, as $Cl_2$ dose and contact time increase, the removal rate of salicylic acid is enhanced. When $O_3$ is used as oxidant, chloramphenicol and ketoprofen is not eliminated at $O_3$ dose range of 0.2~2.0 mg/L. On the contrary, 30~70% of salicylic acid is removed at $O_3$ dose of 1.0~5.0 mg/L. Only 30% removal of salicylic acid is achieved at contact time of 5 min, however, the removal rate is enhanced remarkably at contact time over 10 min. In experiments using $O_3/H_2O_2$ as an oxidant, we can find that $O_3/H_2O_2$ is much more effective than $O_3$ only for removal of 3 pharmaceuticals, and the efficiency is raised according to increase of $H_2O_2$ dose. On reaction rate constant and half-life of 3 pharmaceuticals depending on $Cl_2$, $O_3$ and $O_3/H_2O_2$ dose, experiments using $O_3/H_2O_2$ show that oxidation of pharmaceuticals is less effective as the $H_2O_2/O_3$ ratio increases to above pproximately 1.0 related to reaction rate constant. An oxidation of salicylic acid by $Cl_2$ and $O_3$ particularly has a comparatively high reaction rate constant comparing $O_3/H_2O_2$, and thus salicylic acid is easily eliminated in oxidation processes.

본 연구에서는 다양한 산화공정에서 chloramphenicol, salicylic acid 및 ketoprofen에 대한 제거특성을 평가하였다. 염소 투입농도에 따른 의약물질 3종의 제거특성을 살펴본 결과 chloramphenicol과 ketoprofen은 0.5~5.0 mg/L의 염소 투입농도에서 접촉시간 60분 동안 전혀 제거되지 않았으나 salicylic acid는 1.0 mg/L 이상의 염소 투입농도에서 제거경향이 뚜렷이 나타났며, 접촉시간 및 염소 투입농도가 증가할수록 제거율은 증가하였다. 오존 투입농도에 따른 의약물질 3종의 제거특성을 살펴본 결과 chloramphenicol과 ketoprofen은 0.2~2.0 mg/L의 오존 투입농도에서는 제거되지 않았으며, salicylic acid는 1.0~5.0 mg/L의 오존 투입농도에서 약 30~70%의 제거율을 보였다. 오존/과산화수소 투입농도별로 접촉시간에 따른 의약물질 3종의 제거특성을 살펴본 결과 오존단독 공정보다는 오존/과산화수소 공정에서의 제거율이 높았다. 염소, 오존 및 오존/과산화수소 투입농도별 의약물질 3종에 대한 산화분해 속도상수와 반감기를 살펴본 결과 염소, 오존 단독 투입에 비해 오존/과산화수소 공정에서의 산화분해 속도상수가 큰 것으로 나타났으며, 과산화수소/오존의 비가 1 이상에서는 산화분해 속도상수의 증가율이 둔화되었다. Salicylic acid의 경우는 염소와 오존처리에 의해서도 비교적 큰 산화분해 속도상수를 나타내어 산화공정에서 쉽게 제거가 가능하였다.

Keywords

References

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