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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.

Neutralization of Acid Mine Drainage and CO2 Mineralization Using Waste Concretes