Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Removal Characteristics of Tetracycline, Oxytetracycline, Trimethoprime and Caffeine in Biological Activated Carbon Process

생물활성탄 공정에서 Tetracycline, Oxytetracycline, Trimethoprime 및 Caffeine 제거특성

  • 손희종 (부산광역시 상수도사업본부 수질연구소) ;
  • 황영도 (부산광역시 상수도사업본부 수질연구소) ;
  • 유평종 (부산광역시 상수도사업본부 수질연구소)
  • Received : 2008.07.30
  • Accepted : 2009.03.16
  • Published : 2009.03.31
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Abstract

In this study, The effects of three different activated carbon materials (each coal, coconut and wood based activated carbons), empty bed contact time (EBCT) and water temperature on the removal of pharmaceutical 4 species (oxytetracycline, tetracycline, trimethoprime and caffeine) in BAC filters were investigated. Experiments were conducted at three water temperature (5, 15 and $25^{\circ}C$) and four EBCTs (5, 10, 15 and 20 min). The results indicated that coal based BAC retained more attached bacterial biomass on the surface of the activated carbon than the other BAC, increasing EBCT or increasing water temperature increased the pharmaceutical 4 species removal in BAC columns. In the coal-based BAC columns, removal efficiencies of oxytetracycline and tetracycline were 87~100% and removal efficiencies of trimethoprime and caffeine were 72~99% for EBCT 5~20 min at $25^{\circ}C$. The kinetic analysis suggested a firstorder reaction model for pharmaceutical 4 species removal at various water temperatures (5~$25^{\circ}C$). The pseudo-first-order reaction rate constants and half-lives were also calculated for pharmaceutical 4 species removal at 5~$25^{\circ}C$. The reaction rate and half-lives of pharmaceutical 4 species ranging from 0.0360~0.3954 $min^{-1}$ and 1.75 to 19.25 min various water temperatures and EBCTs, could be used to assist water utilities in designing and operating BAC filters.

활성탄 재질별 유입수의 수온 및 EBCT 변화에 따른 의약물질 4종에 대한 생물분해율을 평가한 결과, 수온 및 EBCT가 증가할수록 의약물질 4종에 대한 생물분해율은 급격히 증가하였으며, 활성탄 재질별로는 석탄계 재질의 활성탄이 가장 우수한 생물분해능을 나타내었고, 다음으로 야자계와 목탄계 활성탄 순이었으며, 의약물질별로는 oxytetracycline이 가장 생물분해능이 큰것으로 나타났으며, 다음으로 tetracycline, trimethoprime 및 caffeine 순으로 조사되었다. 의약물질 4종에 대해 석탄계 재질의 활성탄에서의 수온별(5~$25^{\circ}C$) 생물분해 속도상수 및 반감기를 조사한 결과 oxytetracycline의 경우 생물분해 속도상수가 각각 0.0928 $min^{-1}$에서 0.3954 $min^{-1}$으로 증가하였고, 반감기는 7.47분에서 1.75분으로 감소하였다. 또한, caffeine의 경우는 생물분해 속도상수가 각각 0.0360 $min^{-1}$에서 0.2146 $min^{-1}$으로 증가하였고, 반감기는 19.25분에서 3.23분으로 감소하였다.

Keywords

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