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Abstract <p>Polycyclic aromatic hydrocarbons (PAHs) are persistent pollutants that accumulate more easily in saline alkaline environments. The removal of PAHs from saline-alkali environment poses a significant challenge. Microbial degradation offers a promising low-cost, green, highly efficient approach to remediating PAH pollution. In this study, a moderately halophilic bacterium, designated as strain SL-6, that possesses the ability to efficiently degrade PAHs was isolated from an oil-contaminated soil sample. This strain showed strong adaptability to the saline alkaline environment, growing at pH 6.5–9.5, 15–50°C, and 0–12% NaCl (wt/vol). Under the optimal degrading conditions (pH 8.0, 30°C, and 3.0% NaCl), strain SL-6 could degrade nine types of PAHs. For instance, it fully degraded naphthalene within two days and achieved a degradation efficiency of 96% for phenanthrene within six days. Using polyphasic taxonomic analyses, strain SL-6 was identified as a <i>Stutzerimonas frequens</i> strain. This is the first report for <i>S. frequens</i> to possess the ability to degrade PAHs. The application of <i>S. frequens</i> SL-6 may be an attractive alternative for the bioremediation of PAHs in saline alkaline environments.</p>

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Isolation and Degradation Characteristics of a Novel Halophilic Polycyclic Aromatic Hydrocarbon-Degrading Bacterium

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • H. Cao,
  • S. Wang,
  • L. Guo,
  • B. Zhao,
  • H. Wang,
  • Y. Wang

摘要

Abstract

Polycyclic aromatic hydrocarbons (PAHs) are persistent pollutants that accumulate more easily in saline alkaline environments. The removal of PAHs from saline-alkali environment poses a significant challenge. Microbial degradation offers a promising low-cost, green, highly efficient approach to remediating PAH pollution. In this study, a moderately halophilic bacterium, designated as strain SL-6, that possesses the ability to efficiently degrade PAHs was isolated from an oil-contaminated soil sample. This strain showed strong adaptability to the saline alkaline environment, growing at pH 6.5–9.5, 15–50°C, and 0–12% NaCl (wt/vol). Under the optimal degrading conditions (pH 8.0, 30°C, and 3.0% NaCl), strain SL-6 could degrade nine types of PAHs. For instance, it fully degraded naphthalene within two days and achieved a degradation efficiency of 96% for phenanthrene within six days. Using polyphasic taxonomic analyses, strain SL-6 was identified as a Stutzerimonas frequens strain. This is the first report for S. frequens to possess the ability to degrade PAHs. The application of S. frequens SL-6 may be an attractive alternative for the bioremediation of PAHs in saline alkaline environments.