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<p>Persistent α-terpineol contamination in mining soils, with prolonged inhibition on indigenous microbial communities and increases in the bioavailability of co-occurring pollutants, is toxic for the ecosystem. This underscores the urgent need for the development of effective remediation strategies. This study investigated the efficacy of immobilized biosurfactant-producing bacteria in the bioremediation of α-terpineol-contaminated mining soils. <i>Pseudomonas</i> sp. S4, isolated from non-ferrous metal mining sites, degraded α-terpineol, produced rhamnolipid biosurfactant and showed a broad-spectrum heavy metal resistance. Soil remediation experiments demonstrated that biochar-immobilized S4 significantly enhanced α-terpineol removal in a heavy metal-polluted mining soil, achieving an 89% removal rate within 11 days, far surpassing that by free bacterial inoculation (49%). Notably, the biochar-immobilized S4 not only improved pollutant degradation but also promoted soil microbial diversity, increasing relative abundance of beneficial and degradative bacterial populations. This study presents an integrated bioremediation approach that synergistically combines biosurfactant-mediated solubilization, microbial metabolic degradation, and biochar immobilization, thereby offering a sustainable and efficient solution for the remediation of α-terpineol-contaminated soils.</p>

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Enhanced bioremediation of α-terpineol-contaminated mining soil through immobilization of Indigenous biosurfactant-producing bacteria on biochar

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Jin-Cheng Ye,
  • Wei-Liang Li,
  • You-Qun Xie,
  • Huan Du,
  • Lei Xiang,
  • Bai-Lin Liu,
  • Nai-Xian Feng,
  • Yan-Wen Li,
  • Quan-Ying Cai,
  • Miaoyue Zhang,
  • Ce-Hui Mo,
  • Hai-Ming Zhao

摘要

Persistent α-terpineol contamination in mining soils, with prolonged inhibition on indigenous microbial communities and increases in the bioavailability of co-occurring pollutants, is toxic for the ecosystem. This underscores the urgent need for the development of effective remediation strategies. This study investigated the efficacy of immobilized biosurfactant-producing bacteria in the bioremediation of α-terpineol-contaminated mining soils. Pseudomonas sp. S4, isolated from non-ferrous metal mining sites, degraded α-terpineol, produced rhamnolipid biosurfactant and showed a broad-spectrum heavy metal resistance. Soil remediation experiments demonstrated that biochar-immobilized S4 significantly enhanced α-terpineol removal in a heavy metal-polluted mining soil, achieving an 89% removal rate within 11 days, far surpassing that by free bacterial inoculation (49%). Notably, the biochar-immobilized S4 not only improved pollutant degradation but also promoted soil microbial diversity, increasing relative abundance of beneficial and degradative bacterial populations. This study presents an integrated bioremediation approach that synergistically combines biosurfactant-mediated solubilization, microbial metabolic degradation, and biochar immobilization, thereby offering a sustainable and efficient solution for the remediation of α-terpineol-contaminated soils.