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<p>This study evaluates the hydrochemical compatibility and pore-clogging risks of reinjecting mine water with high total dissolved solids (TDS) into the low-permeability Liujiagou sandstone aquifer in China. Comparative analysis shows that pretreated mine water generally meets water quality requirements, with only minor reductions in SO₄<sup>2</sup>⁻ and F⁻ required. Laboratory experiments and PHREEQC simulations reveal that mixing-induced precipitation is dominated by sulfate and carbonate minerals, peaking at a 1:1 mixing ratio (85.22&#xa0;mg/kg). Aquifer pore-clogging assessment, based on homogeneous and pore-throat deposition models, indicates negligible porosity reduction (≤ 00.0032), implying minimal impact on aquifer permeability. By integrating experimental, numerical, and pore-scale characterization approaches, this work establishes a predictive framework for assessing reinjection sustainability in low-permeability sandstone formations, offering practical guidance for optimizing deep mine water management strategies.</p>

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Hydrochemical and sedimentary effects on hydrogeological properties following mine-water reinjection into low-permeability sandstone aquifers

  • 期刊论文

  • 发表日期：

    2026年6月20日

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  • Xin Li,
  • Ge Chen,
  • Qi Liu

摘要

This study evaluates the hydrochemical compatibility and pore-clogging risks of reinjecting mine water with high total dissolved solids (TDS) into the low-permeability Liujiagou sandstone aquifer in China. Comparative analysis shows that pretreated mine water generally meets water quality requirements, with only minor reductions in SO₄2⁻ and F⁻ required. Laboratory experiments and PHREEQC simulations reveal that mixing-induced precipitation is dominated by sulfate and carbonate minerals, peaking at a 1:1 mixing ratio (85.22 mg/kg). Aquifer pore-clogging assessment, based on homogeneous and pore-throat deposition models, indicates negligible porosity reduction (≤ 00.0032), implying minimal impact on aquifer permeability. By integrating experimental, numerical, and pore-scale characterization approaches, this work establishes a predictive framework for assessing reinjection sustainability in low-permeability sandstone formations, offering practical guidance for optimizing deep mine water management strategies.