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<p>Soil contamination by petroleum products is a critical environmental problem. Phytoremediation using herbaceous or woody plants in combination with microorganisms reduces soil pollutants. In this study, Zinnia (<i>Zinnia hybrida</i> cv. ‘Profusion White’) were grown on unsterilised oil-contaminated soil inoculated with different inoculum concentrations of <i>Acinetobacter junii</i> strain M-2 strains to determine the appropriate inoculum concentration of <i>A. junii</i> M-2 strains for the remediation of contaminated soil. Various concentrations of <i>A. junii</i> strain M-2, alone or in combination with Zinnia, were used. The total petroleum hydrocarbon (TPH) concentrations in inoculated soils (10<sup>9</sup> or 10<sup>11</sup> colony forming units (CFU) /g soil) without Zinnia were significantly lower than those in non-inoculated soils; the remediation effect was greatest at 50&#xa0;days after the start of the test (DAT), and reduced after that. Notably, when the oil-contaminated soil was planted with Zinnia and inoculated with various concentrations of <i>A. junii</i> strain M-2, the soil TPH concentrations decreased significantly over 180&#xa0;days, even with a lower inoculum concentration (10<sup>7</sup>&#xa0;CFU/g soil), and continued to decrease significantly until 180 DAT for all inoculation treatments. Thus, the <i>Z. hybrida</i> ‘Profusion White’ and <i>A. junii</i> strain M-2 combination is an effective treatment for the long-term remediation of oil-contaminated soils.</p>

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Remediation of unsterilized, oil-contaminated soil by planting Zinnia hybrida and inoculating with Acinetobacter junii strain M-2

  • 期刊论文

  • 发表日期：

    2025年3月27日

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  • H. Ikeura,
  • T. Kai,
  • M. Mita,
  • S. Murakami,
  • M. Tamaki

摘要

Soil contamination by petroleum products is a critical environmental problem. Phytoremediation using herbaceous or woody plants in combination with microorganisms reduces soil pollutants. In this study, Zinnia (Zinnia hybrida cv. ‘Profusion White’) were grown on unsterilised oil-contaminated soil inoculated with different inoculum concentrations of Acinetobacter junii strain M-2 strains to determine the appropriate inoculum concentration of A. junii M-2 strains for the remediation of contaminated soil. Various concentrations of A. junii strain M-2, alone or in combination with Zinnia, were used. The total petroleum hydrocarbon (TPH) concentrations in inoculated soils (109 or 1011 colony forming units (CFU) /g soil) without Zinnia were significantly lower than those in non-inoculated soils; the remediation effect was greatest at 50 days after the start of the test (DAT), and reduced after that. Notably, when the oil-contaminated soil was planted with Zinnia and inoculated with various concentrations of A. junii strain M-2, the soil TPH concentrations decreased significantly over 180 days, even with a lower inoculum concentration (107 CFU/g soil), and continued to decrease significantly until 180 DAT for all inoculation treatments. Thus, the Z. hybrida ‘Profusion White’ and A. junii strain M-2 combination is an effective treatment for the long-term remediation of oil-contaminated soils.