Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
권호 표지

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
Download PDF
⟨ Previous Next ⟩

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.

본 연구는 강원도의 수갱과 함백갱에서 배출되는 광산배수를 소석회($Ca(OH)_2$)를 이용하여 중화처리하기 위하여 실시하였다. 소석회의 중화능력을 검토한 결과 수갱과 함백갱에서 배출되는 광산배수 1 L당 0.295 g의 소석회를 투여하였을때 pH는 각각 9.5와 8.4로 유지되어 배출수 방류기준을 만족시켰다. 처리공정에서 발생되는 슬러지를 10~50% 반송한 결과 중화능력은 크게 증진시키지 못하였으며, 오히려 $SO{_4}^{-2}$ 농도는 증가하였다. 슬러지를 30% 반송하였을 때에는 유출수 SS 농도를 감소시킬 수 있었다. $SO{_4}^{-2}$ 농도를 저감시키기 위하여 소석회로 처리된 광산배수 1 L당 0.1 M $BaCl_2$를 100 mL 투여하자 90% 이상이 제거되었다. 유출수의 pH, Fe, 그리고 $SO{_4}^{-2}$를 분석한 결과 중화반응조의 pH와 슬러지반송율은 각각 9.5와 30%로 유지하는 것이 가장 효과적이었다. 수산화나트륨 대신에 소석회를 사용할 경우 유지관리비에서는 31.4%, 시설비에서는 29.8%의 비용감소 효과가 있는 것으로 나타났다.

Keywords

References

  1. B. Gazea, K. Adam, and A. Kontopoulos, Minerals Eng., 9, 23 (1996) https://doi.org/10.1016/0892-6875(95)00129-8
  2. Coal Industry Promotion Board, A Study on Promotion of Natural Treatment System for Acid Mine Drainage, 53 (1997)
  3. G. Lee, J. M. Bigham, and G. Faure, Applied Geochemistry, 17, 569 (2002) https://doi.org/10.1016/S0883-2927(01)00125-1
  4. J. Y. Yoo, Max Coleman, J. The Geological Society of Korea, 36, 1 (2000)
  5. J. D. Powell, Env. Geol. Water Sci., 11, 141 (1988) https://doi.org/10.1007/BF02580450
  6. J. J. Kim and S. J. Kim, Science of the Total Environment, 325, 181 (2004) https://doi.org/10.1016/j.scitotenv.2003.10.038
  7. Ministry of Environment, Korean Standard Test Method for Water Pollution, Donghwae, Seoul (2000)
  8. USEPA, Development Document for Final Effluent Limitations Guidelines, New Source Performance Standards and Pretreatment Standards for the Coal Mining Point Source Category, EPA 440/1-82/057 (1982)
  9. E. G. Galaska, G. J. Skladany, and E. K. Nyer, 44th Purdue Industrial Waste Conference Proceedings, ed. J. M. Bell, 11, Michigan, USA (1990)
  10. S. Rose and W. C. Elliott, Applied Geochemistry, 15, 27 (2000)