Abstract
Batch experiments were conducted to comparatively evaluate the inhibition effects and mechanisms of a low-concentration (1%) proline solution cover on the release of pollutants from high-sulfur coal gangue. High-sulfur coal gangue was continuously immersed in a proline solution and in deionized water (as a control treatment) for 540 days. The results showed that the coal gangue in the control treatment was oxidized and generated leachate with poor water qualities, i.e., the leachate exhibited lower pH values, higher redox potential values, higher pollutant concentrations (SO42−, Fe, Mn, Cu, and Zn), and high levels of acidophilic sulfur-oxidizing bacteria. However, compared to the control treatment, the addition of the proline solution (1%) significantly improved the water quality of the leachate by significantly reducing the Eh values, the pollutant concentrations (SO42−, Fe2+, Fe, Mn, Cu, and Zn), and the activity of acidophilic sulfur-oxidizing bacteria and by significantly increasing the pH value to neutral. The proline treatment significantly inhibited the oxidation of coal gangue and the release of pollutants, mainly by inhibiting the activity of acidophilic sulfur-oxidizing bacteria and by altering the heavy metal fractions and the mineralogical characteristics. Therefore, in engineering practice, workers should consider using an environmental friendly aqueous proline solution cover to achieve the in-situ control of pollutant releases from coal gangue dumps.
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Acknowledgements
The study was funded by a grant from the United Fund of Guizhou Province Government and National Natural Science Foundation of China (No. U1612442-3), the Project of the Education Department of Guizhou Province (Nos. KY 2016011, GZZ 201607, and ZDXK201611).
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Luo, Y., Wu, Y., Fu, T. et al. Effects of a proline solution cover on the geochemical and mineralogical characteristics of high-sulfur coal gangue. Acta Geochim 37, 701–714 (2018). https://doi.org/10.1007/s11631-018-0260-0
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DOI: https://doi.org/10.1007/s11631-018-0260-0