화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.16, No.3, 391-396, June, 2005
Export Citation
소석회를 이용한 산성광산배수 중화처리
Neutralization Treatment of Acid Mine Drainage Using Ca(OH)2
박영구†, 박준석, 홍성주1
  • 삼척대학교 환경공학과
  • 1동양기계(주)
Young-Goo Park†, Joon-Seok Park, and Seong-Ju Hong1
  • Department of Environmental Engineering, Samcheok National University, Smacheok, Gangwon 245-711, Korea
  • 1DongYang machine Co. Ltd., Wonju, Gangwon 220-937, Korea
E-mail:
초록
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 SO4-2 농도는 증가하였다. 슬러지를 30% 반송하였을 때에는 유출수 SS 농도를 감소시킬 수 있었다. SO4-2 농도를 저감시키기 위하여 소석회로 처리된 광산배수 1 L당 0.1 M BaCl2를 100 mL 투여하자 90% 이상이 제거되었다. 유출수의 pH, Fe, 그리고 SO4-2를 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.
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 SO4-2 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 BaCl2 was added to 1 L of AMD treated with Ca(OH)2, removal efficiency of SO4-2 increased to over 90%. Aanalyses of pH, Fe, and SO4-2 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.
Keywords:acid mine drainage (AMD);Ca(OH)2;neutralization
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