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<p>The closure of high-sulfur coal mines has resulted in buried acid-producing pollution sites, posing potential risks to regional aquifers and the surrounding environment. This study focuses on a specific closed mine area, employing physical model experiments and numerical simulations to investigate the distribution of flow and contaminants. The effectiveness of a multi-stage permeable reactive barrier (PRB) system for controlling acid mine drainage (AMD) and its potential effect on hydrodynamic and hydrochemical fields was analyzed. The results indicate that after 10&#xa0;years of continuous acid production, contaminants in the adjacent aquifer had horizontally migrated up to 1332&#xa0;m, covering an area of 2.5 km<sup>2</sup>, with a maximum vertical migration of 120&#xa0;m. If a multi-stage PRB treatment system had been installed, the physical and numerical modeling indicates that SO<sub>4</sub><sup>2−</sup>, total Fe, and total Mn concentrations would have decreased to 212.1, 0.2, and 0.1&#xa0;mg/L, respectively, after 10&#xa0;years of operation. These levels are below the water quality standards of 250, 0.3, and 0.1&#xa0;mg/L, with removal rates of 81.6%, 98.2%, and 98.6%. This study provides a theoretical foundation and practical guidance for managing AMD in closed mines.</p>

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Simulated Study of a Multi-stage Permeable Reactive Barrier for In-Situ AMD Treatment of a Closed High-Sulfur Coal Mine

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Yueming Qi,
  • Pei Zhou,
  • Dan Jiang,
  • Lai Zhou,
  • Yanzhuo Liu,
  • Jiehui Zhang

摘要

The closure of high-sulfur coal mines has resulted in buried acid-producing pollution sites, posing potential risks to regional aquifers and the surrounding environment. This study focuses on a specific closed mine area, employing physical model experiments and numerical simulations to investigate the distribution of flow and contaminants. The effectiveness of a multi-stage permeable reactive barrier (PRB) system for controlling acid mine drainage (AMD) and its potential effect on hydrodynamic and hydrochemical fields was analyzed. The results indicate that after 10 years of continuous acid production, contaminants in the adjacent aquifer had horizontally migrated up to 1332 m, covering an area of 2.5 km2, with a maximum vertical migration of 120 m. If a multi-stage PRB treatment system had been installed, the physical and numerical modeling indicates that SO42−, total Fe, and total Mn concentrations would have decreased to 212.1, 0.2, and 0.1 mg/L, respectively, after 10 years of operation. These levels are below the water quality standards of 250, 0.3, and 0.1 mg/L, with removal rates of 81.6%, 98.2%, and 98.6%. This study provides a theoretical foundation and practical guidance for managing AMD in closed mines.