폐콘크리트를 이용한 산성광산배수의 중화 및 CO2 광물화
Neutralization of Acid Mine Drainage and CO2 Mineralization Using Waste Concretes
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본 연구에서는 산성광산배수의 중화제로 폐콘크리트 미분말의 적용성을 알아보고 동시에 CO2 광물화의 가 능성을 고찰하였다. 폐콘크리트는 파·분쇄 후 체가름을 통한 75 µm 이하의 미분말을 인공광산배수 500 mL에 첨가하 여 pH가 11 정도가 되어 탄산화가 원활히 진행되도록 하였다. 지속적인 교반을 통해 pH를 안정화 시킨 후 다양한 주입 속도로 pH 8.3에 이를 때까지 CO2를 주입하였다. CO2 주입 종료 후 용액의 pH는 6.3∼8.2 범위 내에서 안정화되었으 며, pH와 금속이온 농도 모두 수질오염물질 배출허용기준에 적합한 것으로 나타났다. 본 연구에서 폐콘크리트 미분 말을 이용한 산성광산배수(AMD)의 중화-탄산화 실험을 통해 폐콘크리트를 이용하여 AMD의 중화 및 중금속 제어 과 함께 CO2를 효율적으로 광물화할 수 있음을 실험적으로 확인하였다. 또한 광산배수의 특성에 의해 중화-탄산화를 위한 폐콘크리트의 투입량이 조절되며, 이에 따라 CO2 고정화 효율에 영향을 주는 것으로 판단된다.
Abstract
The present paper deals with applicability of waste concretes for neutralization of acid mine drainage (AMD) and mineralization of carbon dioxide (CO2). Ground waste concrete powders of under 75 µm were added to artificial mine drainage of 500 mL, until their pH reached about 11. When the pH of each solution was stabilized through continuous agitation, CO2 gas was injected with various flow rates until the pH decreased to 8.3. After termination of CO2 injection, the pH of the solutions decreased to the range of 6.3 to 8.2, furthermore, both pH and metal concentrations of the treated solutions were tolerable in terms of the effluent standard. In this experimental study of the AMD neutralization-carbonation using waste concretes, it was confirmed that AMD neutralization, metal control and CO2 mineralization can be conducted by waste concretes. It is also known that the efficiency of CO2 immobilization through neutralization-carbonation of acid mine drainage is dependent on waste concrete inputs which is controlled by the AMD property.
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