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<p>Current research on microbially induced calcite precipitation (MICP) has primarily focused on bacterial-mediated heavy metals (HMs) immobilization, while the potential of urease-producing fungi remains largely unexplored. In this study, two high-activity urease-producing fungal strains, <i>Aspergillus sydowii</i> and <i>Fusarium oxysporum</i>, were isolated from HM-contaminated soils. Cr(VI) removal was driven by fungal urease hydrolyzing urea to release carbonate ions and elevate the local pH, facilitating CaCO<sub>3</sub> precipitation in the presence of Ca<sup>2+</sup>. Dissolved Cr(VI) was subsequently eliminated through surface adsorption onto fungal hyphae, complexation with extracellular polymers, and co-precipitation within the newly formed carbonate precipitation(Ca<sub>10</sub>Cr<sub>6</sub>O<sub>24</sub>(CO<sub>3</sub>)), leading to a rapid decrease in Cr(VI) concentration within 48&#xa0;h. The growth dynamics of these strains under various stress conditions were investigated using the Gompertz model, and the growth parameters were optimized, and characterization via XRD and FTIR confirmed the formation of calcium chromium carbonate oxide, calcite, and vaterite as dominant mineral phases. Both strains demonstrated strong Cr(VI) tolerance, achieving immobilization efficiencies of 81.8% and 70.0%, respectively. These findings highlight the feasibility of employing urease-producing fungi for ecological restoration of mining soils and synergistic soil carbon sequestration, providing novel insights into fungal-driven MICP technologies for sustainable environmental remediation.</p>

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MICP mechanism of urease-producing fungi mediating Cr(VI) bioprecipitation and its potential for ecological remediation in mining areas

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Jinshuai Shi,
  • Ling Ge,
  • Xuesong Hu,
  • Caihong Yu

摘要

Current research on microbially induced calcite precipitation (MICP) has primarily focused on bacterial-mediated heavy metals (HMs) immobilization, while the potential of urease-producing fungi remains largely unexplored. In this study, two high-activity urease-producing fungal strains, Aspergillus sydowii and Fusarium oxysporum, were isolated from HM-contaminated soils. Cr(VI) removal was driven by fungal urease hydrolyzing urea to release carbonate ions and elevate the local pH, facilitating CaCO3 precipitation in the presence of Ca2+. Dissolved Cr(VI) was subsequently eliminated through surface adsorption onto fungal hyphae, complexation with extracellular polymers, and co-precipitation within the newly formed carbonate precipitation(Ca10Cr6O24(CO3)), leading to a rapid decrease in Cr(VI) concentration within 48 h. The growth dynamics of these strains under various stress conditions were investigated using the Gompertz model, and the growth parameters were optimized, and characterization via XRD and FTIR confirmed the formation of calcium chromium carbonate oxide, calcite, and vaterite as dominant mineral phases. Both strains demonstrated strong Cr(VI) tolerance, achieving immobilization efficiencies of 81.8% and 70.0%, respectively. These findings highlight the feasibility of employing urease-producing fungi for ecological restoration of mining soils and synergistic soil carbon sequestration, providing novel insights into fungal-driven MICP technologies for sustainable environmental remediation.