Abstract
The underground environmental problems caused by oil shale in-situ mining are complexed and continuous. Core stress seepage experiment is an effective method for understanding contaminant migration. The scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP) showed that permeability was improved largely in oil shale residual (500°C). The transform of basic characteristics of oil shale was the key factor to promote the migration and release of pollutants. This paper analyzed dynamic migration of eight elements (Co, Cu, Zn, Ni, As, Cd, Cr, and Pb) in oil shale residues under in-situ seepage stress. Physical characterization of oil shale were combined with geochemical fractions of metals to comprehensively analyse the influence of seepage processes on the release of heavy metal. The results revealed that the migration of heavy metals was divided into rapid stage and equilibrium stage. Highest concentrations of all aimed elements were observed in the first day. Leaching content of elements was related to environmental change of water-rock interface reactions, particularly on the pH. Based on speciation of heavy metal, Ni, Cd, Co, and Zn were considered easily mobile element. Our study indicated that oil shale in-situ mining required more attention for controlling heavy metals risk of groundwater.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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This study was supported by the National Key Research and Development Program (Grant number: 2019YFA0705504).
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Xu, L., Ji, D., He, S. et al. Migration Characteristics Analysis of Heavy Metal in Oil Shale Based on In-situ Core Seepage Experiments. Water Air Soil Pollut 235, 535 (2024). https://doi.org/10.1007/s11270-024-07270-7
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DOI: https://doi.org/10.1007/s11270-024-07270-7