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<p>Carbon mineralization sequesters atmospheric CO<sub>2</sub> by reacting it with cations from rock weathering to form carbonates. However, natural rates are too slow, and acceleration with chemical or mechanical methods is expensive. Microbial processes (acidolysis, redoxolysis, complexolysis) could speed weathering with less energy. However, no microorganisms have been employed at industrial scale to dissolve ultramafic rocks. Although some microbes dissolve ultramafic rocks), their performance remains poorly understood. Here, we compare the dissolution of dunite (&gt; 90% olivine) by three mineral-dissolving microbes: <i>Gluconobacter oxydans</i><i>Sphingomonas desiccabilis</i> and <i>Penicillium simplicissimum</i>. <i>G. oxydans</i> outperformed the others, producing the most acidic biolixiviant (pH 2.15 at 1% pulp density) and extracting the most magnesium (3,130&#xa0;mg/L at 3% pulp density). It also co-dissolved nine metals, including eight critical for energy technologies (Cr, Mn, Co, Ni, Cu, Zn) reaching up to 33&#xa0;mg/L Ni. Increasing pulp density boosted metal dissolution by <i>G. oxydans</i> and <i>S. desiccabilis</i> but inhibited <i>P. simplicissimum</i> above 2% pulp density. These results show <i>G. oxydans</i> is best suited for engineering to enhance bio-accelerated weathering, reducing costs and environmental impacts. Finally, both <i>G. oxydans</i> and <i>P. simplicissimum</i> can use cellulosic hydrolysate instead of glucose, lowering substrate costs for biolixiviant production.</p>

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Cross-species comparison of ultramafic rock bio-accelerated weathering performance

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年8月11日

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  • Luke Plante,
  • Jacob D. Klug,
  • Joseph J. Lee,
  • Adrian Hornby,
  • James Adair,
  • Sabrina Marecos,
  • Matthew C. Reid,
  • Esteban Gazel,
  • Buz Barstow

摘要

Carbon mineralization sequesters atmospheric CO2 by reacting it with cations from rock weathering to form carbonates. However, natural rates are too slow, and acceleration with chemical or mechanical methods is expensive. Microbial processes (acidolysis, redoxolysis, complexolysis) could speed weathering with less energy. However, no microorganisms have been employed at industrial scale to dissolve ultramafic rocks. Although some microbes dissolve ultramafic rocks), their performance remains poorly understood. Here, we compare the dissolution of dunite (> 90% olivine) by three mineral-dissolving microbes: Gluconobacter oxydansSphingomonas desiccabilis and Penicillium simplicissimum. G. oxydans outperformed the others, producing the most acidic biolixiviant (pH 2.15 at 1% pulp density) and extracting the most magnesium (3,130 mg/L at 3% pulp density). It also co-dissolved nine metals, including eight critical for energy technologies (Cr, Mn, Co, Ni, Cu, Zn) reaching up to 33 mg/L Ni. Increasing pulp density boosted metal dissolution by G. oxydans and S. desiccabilis but inhibited P. simplicissimum above 2% pulp density. These results show G. oxydans is best suited for engineering to enhance bio-accelerated weathering, reducing costs and environmental impacts. Finally, both G. oxydans and P. simplicissimum can use cellulosic hydrolysate instead of glucose, lowering substrate costs for biolixiviant production.