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Abstract <p>In this study, a new halotolerant strain, <i>Acidithiobacillus ferrooxidans</i> TSM-1403, was isolated and genetically characterized, and its role in uranium bioleaching was evaluated. Process optimization was performed using Response Surface Methodology, showing a strong correlation between predicted and experimental values (<i>R</i><sup>2</sup> = 0.91). Results indicated that higher iron concentration improved recovery, while increasing pulp density reduced it. Prolonged bioleaching enhanced extraction, achieving up to 74.37%. The highest recovery (70.36%) was obtained under optimal conditions (Inoculum: 10%, pulp density: 6.29% w/v, Fe<sup>2</sup>⁺ concentration: 8.94&#xa0;g/L and time: 7.89&#xa0;days). The strain tolerated ≤ 1.7% NaCl, confirming its potential for uranium extraction in saline environments and conservation of freshwater resources.</p> Graphical abstract <p></p>

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Optimization of uranium bioleaching by a salt-tolerant Acidithiobacillus ferrooxidans using response surface methodology

  • 期刊论文

  • 发表日期：

    2025年10月11日

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  • Maryam Shoja,
  • Parisa Mohammadi,
  • Parisa Tajer-Mohammad-Ghazvini,
  • Hassan Zare-Tavakoli

摘要

Abstract

In this study, a new halotolerant strain, Acidithiobacillus ferrooxidans TSM-1403, was isolated and genetically characterized, and its role in uranium bioleaching was evaluated. Process optimization was performed using Response Surface Methodology, showing a strong correlation between predicted and experimental values (R2 = 0.91). Results indicated that higher iron concentration improved recovery, while increasing pulp density reduced it. Prolonged bioleaching enhanced extraction, achieving up to 74.37%. The highest recovery (70.36%) was obtained under optimal conditions (Inoculum: 10%, pulp density: 6.29% w/v, Fe2⁺ concentration: 8.94 g/L and time: 7.89 days). The strain tolerated ≤ 1.7% NaCl, confirming its potential for uranium extraction in saline environments and conservation of freshwater resources.

Graphical abstract