Study on Co-placement of Coal Combustion Ash-coal Waste Rock for Minimizing Acid Mine Drainage Generation: A Preliminary Result of Field Column Test Experiment

As the increasing of coal utilization, requirement on re-utilization of coal combustion ash (CCA) was also increased. In the mine site, having considered the some advantage characteristics of CCA, co-placement with overburden rock in the overburden dumping area of mining site is to be one potential alternative to be implemented. In t his paper, the potential use of CCA from a specific site power plant as a layer in the dry cover system was studied. According to the quality of discharged water and measured-oxygen concentration within the column under the influences of local climate, the experiment indicates some advantages of CCA utilization such as higher on pH, alkalinity and higher capacity to prevent oxygen diffusion into the colum n. These results offer a promising technique to re-utilize CCA in controlling acid mine drainage (AMD) generation from potentially acid forming overburden rock.