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<p>Soil pollution by hydrocarbons represents an environmental and health problem. The oil industry has increased in the last few decades in Mexico, and several accidents in soil and oceans have occurred. This research aims to evaluate a soil bioremediation method using an inoculum from contaminated soil to provide a fast and efficient way to control the negative impacts of oil and its derivates spills in Mexican soils. Native soils from the Hidalgo and Yucatan states and an inoculum formed by isolated bacteria from hydrocarbon-contaminated soil in the Yucatan state were used. Fifty-six microcosms, each containing 10&#xa0;g of soil, 2 mL of consortia solution, and 1 mL of diesel, were maintained under room conditions (~ 30&#xa0;°C) and at 70% of their water-holding capacity for 0, 6, 9, 15, 17, and 19 days. High removal efficiencies were observed in the microwave-assisted extraction and gas chromatography analysis. Although DT<sub>50</sub> was lower in the Hidalgo soil for total hydrocarbons (diesel), for 19 days, the highest dissipation was in Yucatan soil (7.22% remnant). Individually, decane, dodecane, and hexadecane were degraded more readily in Yucatan soil. Hidalgo soil exhibited the best dissipation of tetradecane (10.44% residual) at 19 days. Microorganisms seem more likely to grow and degrade hydrocarbons in Yucatan soil. Statistical analysis showed that soil source (Yucatan and Hidalgo) and soil characteristics (Nitrogen and carbon content, conductivity, pH, and field capacity) were significant (<i>P</i> &lt; 0.05) on bacteria growth. Hydrocarbon type, soil source, and contact time in soil were significant (<i>P</i> &lt; 0.05) on hydrocarbon dissipation. Hydrocarbon removal rates were shown to be influenced by microbial growth. Soil characteristics seem to play an important role in microbial growth and, consequently, in hydrocarbon removal. High hydrocarbon removal was observed in inoculated systems; however, because non-inoculated controls were absent, the specific contribution of the inoculum cannot be conclusively determined. Inoculum can be used to remediate soil contaminated with diesel as part of oil pollution control.</p>

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Hydrocarbon bioremediation in a karstic and leptosol soils from Mexico. The efficiency of soil inoculation on hydrocarbon removal

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Germán Giácoman-Vallejos,
  • Virgilio René Góngora-Echeverría,
  • José Francisco Paunero-Peña,
  • Carmen Ponce-Caballero,
  • Carlos Quital-Franco,
  • Marisela Vega-de-Lille,
  • Roger Méndez-Novelo

摘要

Soil pollution by hydrocarbons represents an environmental and health problem. The oil industry has increased in the last few decades in Mexico, and several accidents in soil and oceans have occurred. This research aims to evaluate a soil bioremediation method using an inoculum from contaminated soil to provide a fast and efficient way to control the negative impacts of oil and its derivates spills in Mexican soils. Native soils from the Hidalgo and Yucatan states and an inoculum formed by isolated bacteria from hydrocarbon-contaminated soil in the Yucatan state were used. Fifty-six microcosms, each containing 10 g of soil, 2 mL of consortia solution, and 1 mL of diesel, were maintained under room conditions (~ 30 °C) and at 70% of their water-holding capacity for 0, 6, 9, 15, 17, and 19 days. High removal efficiencies were observed in the microwave-assisted extraction and gas chromatography analysis. Although DT50 was lower in the Hidalgo soil for total hydrocarbons (diesel), for 19 days, the highest dissipation was in Yucatan soil (7.22% remnant). Individually, decane, dodecane, and hexadecane were degraded more readily in Yucatan soil. Hidalgo soil exhibited the best dissipation of tetradecane (10.44% residual) at 19 days. Microorganisms seem more likely to grow and degrade hydrocarbons in Yucatan soil. Statistical analysis showed that soil source (Yucatan and Hidalgo) and soil characteristics (Nitrogen and carbon content, conductivity, pH, and field capacity) were significant (P < 0.05) on bacteria growth. Hydrocarbon type, soil source, and contact time in soil were significant (P < 0.05) on hydrocarbon dissipation. Hydrocarbon removal rates were shown to be influenced by microbial growth. Soil characteristics seem to play an important role in microbial growth and, consequently, in hydrocarbon removal. High hydrocarbon removal was observed in inoculated systems; however, because non-inoculated controls were absent, the specific contribution of the inoculum cannot be conclusively determined. Inoculum can be used to remediate soil contaminated with diesel as part of oil pollution control.