Neutralization Treatment of Acid Mine Drainage Using Ca(OH)2

소석회를 이용한 산성광산배수 중화처리

  • Park, Young-Goo (Department of Environmental Engineering, Samcheok National University) ;
  • Park, Joon-Seok (Department of Environmental Engineering, Samcheok National University) ;
  • Hong, Seong-Ju (DongYang Machine Co. Ltd.)
  • Received : 2005.01.18
  • Accepted : 2005.03.16
  • Published : 2005.06.10

Abstract

This study was conducted to neutralize acid mine drainage (AMD) of Soo and Hambaek mines, located in Kangwon-Do Korea, using $Ca(OH)_2$. When 0.295 g $Ca(OH)_2/L$(AMD) was added to the drainage in a neutralization reactor, pH of liquid in the reactor and the effluent were maintained at 9.5 and 8.4, respectively. The pH met the required effluent standard. With 10~50% of feedback of effulent sludge to the reactor, the pH of neutralized fluid in the reactor remained nearly constant, but $SO{_4}^{-2}$ concentration in the effluent increased adversely compared to the non-return sludge case. With 30% of sludge feedback, it was possible to decrease suspended solids (SS) concentration in the effluent without a problem in Fe concentration. When 100 mL of 0.1 M $BaCl_2$ was added to 1 L of AMD treated with $Ca(OH)_2$, removal efficiency of $SO{_4}^{-2}$ increased to over 90%. Aanalyses of pH, Fe, and $SO{_4}^{-2}$ showed that the optimal results were obtained when pH of neutralizatio reactor and sludge return ratio were maintained at 9.5 and 30%. This can result in possible cost reduction of 31.4% for maintenance and 29.8% for facility construction by alternating $Ca(OH)_2$ to NaOH.

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