Abstract
Adding coal ash to acid waste decreases its acidity and supplies essential nutrients to plants. The effects of coal ash on acid coal mine waste and acid mine drainage were investigated in the field. Treatments were mixtures of coal mine waste with coal ash (0, 20, and 40%). Addition of coal ash increased the pH of coal mine waste and leachate by 3.11 and 3.03 units, respectively. After stabilization, the concentrations in the leachate decreased from 4.65 to 0.44 mg L−1 for Fe and from 0.31 mg L−1 to “not detected” for Pb. The organic matter content and cation exchange capacity increased significantly (approximately twofold each), for coal mine waste with coal ash. Moreover, plant growth on coal mine waste that had been treated with coal ash was greatly stimulated. The application of coal ash offers an environmentally compatible, cost-effective way to remediate coal mine waste or leachate contaminated with heavy metals.
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This study was supported by 2014 research Grants from Kangwon National University (No. C1010720-01-01) and the Energy and Resource Recycling of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant funded by the Korean Government Ministry of Knowledge Economy (No. 2010T100100611).
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Kim, S.C., Oh, S.J., Oh, S.M. et al. In situ reclamation of closed coal mine waste in Korea using coal ash. Appl Biol Chem 60, 265–272 (2017). https://doi.org/10.1007/s13765-017-0275-y
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DOI: https://doi.org/10.1007/s13765-017-0275-y