Effect of pH and Temperature on the Adsorption of Heavy Metals in Acid Mine Drainage (AMD) Onto Coal Mine Drainage Sludge (CMDS)

탄광슬러지를 이용한 금속광산 산성배수 처리 시 pH및 온도의 영향

  • Cui, Ming-Can (Determent of Civil Environmental and Architecture, Korea University) ;
  • Lim, Jung-Hyun (Determent of Civil Environmental and Architecture, Korea University) ;
  • Kweon, Bo-Youn (Determent of Civil Environmental and Architecture, Korea University) ;
  • Jang, Min (Mine Reclamation Corporation) ;
  • Shim, Yon-Sik (Mine Reclamation Corporation) ;
  • Khim, Jee-Hyeong (Determent of Civil Environmental and Architecture, Korea University)
  • 최명찬 (고려대학교 건축사회환경공학과) ;
  • 임정현 (고려대학교 건축사회환경공학과) ;
  • 권보연 (고려대학교 건축사회환경공학과) ;
  • 장민 (한국광해방지관리공단) ;
  • 심연식 (한국광해방지관리공단) ;
  • 김지형 (고려대학교 건축사회환경공학과)
  • Published : 2009.02.28

Abstract

In this study, the effect of pH and temperature on the adsorption behavior of acid mine drainage (AMD) on coal mine drainage sludge (CMDS) has been investigated during the treatment of coal mine drainage (CMD) by electrical purification method. The pH$_{zero\;point\;charge}$ (pH$_{zpc}$) of CMDS was 5. The removal ratio of copper, zinc, cadmium, iron were increased according to the increase of pH value. The adsorption amount of copper showed 0.64 mg g$^{-1}$ sludge. It was independent of pH value. The adsorption amount of the other metals showed l.l times when pH was 3. The adsorption amount of chromium was a little bit increased at the pH value higher than 7 due to a small amount of the chromium was eluted as $Cr(OH)_6^{3-}$. The amount of metals' absorption were decreased according to temperature was increase at pH value was 3. The selectivity order was Cd>Fe > Zn > Cu. The amount of absorption showed q$_{max}$ Cu 2.747 mg g$^{-1}$ andZn 2.525 mg g$^{-1}$ when pH value higher than 5. It was independent of temperature.

본 연구에서는 석탄광산 배수(CMD)를 전기정화법으로 처리 시 발생되는 슬러지를 흡착제로 금속광산 산성배수(AMD)중 중금속 처리 시 pH와 온도변화에 따른 중금속 흡착 거동을 연구하고자 하였다. 실험결과 CMDS의 pH$_{zero\;point\; charge}$:(pH$_{zpc}$)는 5로 나타났다. pH영향의 경우 구리, 아연, 카드뮴, 철은 pH 증가에 따라 제거율은 증가하였고, 구리의 경우 흡착량은 pH와 상관없이 0.64 mg g$^{-1}$ sludge로 나타났다. pH 5 이상일 때 기타 중금속 흡착량은 pH3일 때의 1.1 배로 나타났고 크롬의 경우 pH 7 이상에서 다소 증가하였는데 이는 크롬이 $Cr(OH)_{6}^{3-}$형태로 미량 용출되었기 때문이다. 온도의 영향에서 pH3일때 온도증가에 따라 중금속 흡착량은 증가하였고, 선택도Cd>Fe>Zn>Cu순으로 나타났다. pH 5이상에서 최대 흡착량(q$_{max}$)은 Cu와 Zn의 경우 각각 2.747mg g$^{-1}$와 2.525mg g$^{-1}$로 더 이상의 흡착이 일어나지 않아 온도의 영향을 받지 않은 것으로 판단된다.

Keywords

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