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<p>This study investigated the remediation of acidic uranium mine groundwater using SRB in a horizontal-flow reactor. Raising the pH from 3.5 to 4.5 shortened the time required for effluent sulfate to drop to ≤ 350&#xa0;mg/L from 38 to 28&#xa0;days, while the uranium concentration remained below 0.5&#xa0;mg/L. Optimal removal occurred at 0.7&#xa0;mL/min. U(VI) was immobilized via microbial reduction, co-precipitation (e.g., CaU(PO<sub>4</sub>)<sub>2</sub>, FeS), and surface complexation. Immobilized uranium remained stable under harsh conditions (pH 2, NO<sub>3</sub><sup>−</sup>, aeration), with release rates below 2.68%, 0.16%, and 0.5%, respectively. This study supports remediation strategies for acid in-situ leached uranium mines.</p>

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Remediation of acidic uranium mine groundwater using sulfate-reducing bacteria: sulfate reduction and uranium immobilization behavior and mechanisms

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Hongliang Chen,
  • Hongjiao Peng,
  • Yajie Liu,
  • Xiaoxia Yu,
  • Bei Zhao,
  • Jian Wang,
  • Zhanxue Sun

摘要

This study investigated the remediation of acidic uranium mine groundwater using SRB in a horizontal-flow reactor. Raising the pH from 3.5 to 4.5 shortened the time required for effluent sulfate to drop to ≤ 350 mg/L from 38 to 28 days, while the uranium concentration remained below 0.5 mg/L. Optimal removal occurred at 0.7 mL/min. U(VI) was immobilized via microbial reduction, co-precipitation (e.g., CaU(PO4)2, FeS), and surface complexation. Immobilized uranium remained stable under harsh conditions (pH 2, NO3−, aeration), with release rates below 2.68%, 0.16%, and 0.5%, respectively. This study supports remediation strategies for acid in-situ leached uranium mines.