대한환경공학회지 (Journal of Korean Society of Environmental Engineers)

  • 제37권2호
  • /
  • Pages.73-80
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  • 2015
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  • 1225-5025(pISSN)
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  • 2383-7810(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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망간산화물(birnessite)에 의한 수용액 중 Tetracycline의 산화-변환반응에 대한 연구

Oxidative Transformation of Tetracycline in Aqueous Solution by Birnessite

  • 엄원숙 (서울과학기술대학교 환경공학과) ;
  • 김소희 (서울과학기술대학교 환경공학과) ;
  • 신현상 (서울과학기술대학교 환경공학과)
  • Eom, Won-Suk (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Kim, So-Hui (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Shin, Hyun-Sang (Department of Environmental Engineering, Seoul National University of Science and Technology)
  • 투고 : 2014.12.26
  • 심사 : 2015.02.05
  • 발행 : 2015.02.28
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초록

본 연구에서는 잔류의약물질로써 환경에서 노출 빈도가 높은 항생물질인 Tetracycline (TTC)을 대상으로 수용액 상에서의 망간산화물(birnessite)을 이용한 산화-변환 반응을 통한 제거와 용존성 자연유기물인 휴믹산(HA) 존재에 따른 영향을 조사하였다. TTC의 산화-변환 제거 특성 실험은 다양한 반응조건(반응시간, 망간산화물 주입량 및 pH 등)에서 회분식으로 조사하였으며, HA의 영향은 pH (3~9)와 HA농도 변화에 따라 조사하였다. 실험결과는 유사-일차 반응속도식을 적용하여 해석하였으며, 본 실험조건(TTC=0.25 mM, ${\delta}-MnO_2=1.0g/L$)에서의 TTC의 산화-변환 제거 반응속도상수(k, $hr^{-1}$)는 pH가 감소함에 따라 0.98 (pH 9)에서 2.97 (pH 3)로 일정하게 증가하였고, 망간산화물 주입량(1~2 g/L)이 2배 증가할 때 반응속도 상수는 약 1.3배 정도 증가하였다. HA (5 mg-C/L) 존재 시 망간산화물에 의한 TTC 변환제거는 $pH{\geq}6$에서 반응효율 상승을 나타냈으며, HA의 주입농도(1~10 mg-C/L, at pH 6)의 증가에 따라 일정하게 증가함을 확인하였다. 이상에서 얻은 연구결과는 기존 문헌에 제시된 TTC 반응기작과 비교 해석하였고, 망간산화물을 매개로 한 TTC의 산환-변환 제거 반응특성과 HA의 존재가 미치는 영향에 대하여 고찰하였다.

An investigation on the removals of tetracycline (TTC), which is a family of antibiotics widely founded in the environment, from the aqueous solution by birnessite(${\delta}-MnO_2$)-mediated oxidative transformation was described. This study also examined the potential effect of the naturally occurring substances, humic acid (HA) on the oxidative transformation. The experiment was carried out in various conditions (reaction time, Mn oxide loadings, pH) and in the presence of HA as a batch test. The removals of TTC followed pseudo-first order reactions, and rate constants (k, $hr^{-1}$) for the removals of TTC were constantly increased with decreasing pH from 0.98 (pH 9) to 2.97 (pH 3). The rate constants also increased about 1.3 times when the birnessite loading increased from 1 to 2 g/L. Presence of HA (5 mg-C/L, at $pH{\geq}6$) caused some enhancement in the removals of TTC as compared to the control, and also showed the removal efficiencies of TTC in the birnessite mediated systems (TTC=0.25 mM, ${\delta}-MnO_2=2.0g/L$, pH 6) increased with increasing HA concentrations (1~10 mg-C/L). The results obtained from the oxidative transformation of TTC and the effect of HA were discussed in terms of reaction characteristics and mechanism.

키워드

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