Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Evaluation of Purification Efficiency of Passive Treatment Systems for Acid Mine Drainage and Characterization of Precipitates in Ilwal Coal Mine

일월탄광에서 유출되는 산성광산배수 자연정화시설의 정화 효율 평가 및 침전물의 특성연구

  • Ryu, Chung Seok (Korea Environment Corporation) ;
  • Kim, Yeong Hun (Department of environmental engineering, Andong National University) ;
  • Kim, Jeong Jin (Department of Earth and Environmental Sciences, Andong National University)
  • Received : 2014.05.26
  • Accepted : 2014.06.18
  • Published : 2014.06.30
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Abstract

Artificial precipitation ponds, consisting of three steps of oxidation pond, successive alkalinity producing system (SAPS) and swamp, were constructed for the treatment of the acid mine drainage from the Iwal coal mine. The efficacies of the passive treatment system in terms of neutralization of mine water and removal of dissolved ions were evaluated by the chemical analyses of the water samples. Mine water in the mine adits was acidic, showing the pH value of 2.28-2.42 but the value increased rapidly to 6.17-6.53 in the Oxidation pond. The purification efficiencies for the removal of Al and Fe were 100%, whereas those of $SO_4$, Mg, Ca, and Mn were relatively low of 50%, 40%, 24%, and 59%, respectively. These results indicate a need for application of additional remediation techniques in the passive treatment systems. The precipitates that formed at the bottom of the mine water channels were mainly schwertmannite ($Fe_8O_8(OH)_6SO_4$) and those in the leachate water were 2-line ferrihydrite ($Fe_2O_3{cdot}0.5H_2O$).

일월탄광에는 산화조, SAPS, 소택지의 3단계 자연정화시설이 설치되어 있으며 갱내수를 모아 정화한 후 주변 하천으로 유출시키고 있다. 일월탄광 갱내수의 pH 값은 계절에 관계없이 2.28-2.42로 낮은값을 나타내지만 산화조를 거치는 동안 pH 값은 6.17-6.53 급격하게 증가한다. 정화시설에 의한 정화효율은 $SO_4$, Mg, Al, Ca, Mn은 각각 약 50%, 40%, 100%, 24%, 59%이다. 갱내수의 Fe는 아주 낮은 값($1.06-1.09mg/{\ell}$)이지만 정화시설을 거치는 동안 100%의 제거효율을 나타낸다. 이와 같이 일월탄광에 설치한 정화시설은 pH 상승과 Fe와 Al의 제거 효율은 높지만 $SO_4$, Mg, Ca, Mn 등은 60% 이하로 상대적으로 낮다. 따라서 이러한 이온을 제거하기 위해서는 다른 정화기술을 적용해야 할 것으로 판단된다. pH 2.28-2.42 범위인 갱내수가 유입되는 정화시설 바닥에 침전되는 침전물은 슈워트마나이트이며 ($Fe_8O_8(OH)_6SO_4$), pH 5.83-5.96인 침출수에서는 2-line 페리하이드라이트(2-line $Fe_2O_3{cdot}0.5H_2O$H2O)가 침전된다.

Keywords

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