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<p>The remediation of hydrocarbon-contaminated soil is a critical environmental challenge, particularly in areas affected by industrial activities. This study investigates the effects of different organic waste mixtures on hydrocarbon degradation in chronically contaminated soil thought microcosm systems. Four treatments were evaluated: natural attenuation (C), soil amended with spent mushroom substrate and sweet potato peel (W1), soil amended with soybean texturized waste and orange peel (W2), and soil amended with stabilized poultry litter and effluent from yeast production (W3). The results indicate that the amended soils showed significantly (<i>P</i> &lt; 0.05) enhanced microbial activity compared to natural attenuation, with W3 leading to the highest levels of hydrocarbon degradation (73.6%) at 90&#xa0;days. Seed germination rates in the phytotoxicity assay were also significantly (<i>P</i> &lt; 0.05) improved in W1 and W2 treatments. The combined application of organic residues provided essential nutrients and microbial stimulants, promoting hydrocarbons biodegradation. These findings suggest that adequate and balanced organic waste amendments can be effective strategy for the bioremediation of chronically hydrocarbon-polluted soils.</p>

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Organic Waste Mixtures for Improving Hydrocarbon Bioremediation in Chronically Polluted Soil

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Debora Conde Molina,
  • Vanina Di Gregorio,
  • Gabriel Busnardo,
  • Franco Liporace,
  • Carla V. Quevedo

摘要

The remediation of hydrocarbon-contaminated soil is a critical environmental challenge, particularly in areas affected by industrial activities. This study investigates the effects of different organic waste mixtures on hydrocarbon degradation in chronically contaminated soil thought microcosm systems. Four treatments were evaluated: natural attenuation (C), soil amended with spent mushroom substrate and sweet potato peel (W1), soil amended with soybean texturized waste and orange peel (W2), and soil amended with stabilized poultry litter and effluent from yeast production (W3). The results indicate that the amended soils showed significantly (P < 0.05) enhanced microbial activity compared to natural attenuation, with W3 leading to the highest levels of hydrocarbon degradation (73.6%) at 90 days. Seed germination rates in the phytotoxicity assay were also significantly (P < 0.05) improved in W1 and W2 treatments. The combined application of organic residues provided essential nutrients and microbial stimulants, promoting hydrocarbons biodegradation. These findings suggest that adequate and balanced organic waste amendments can be effective strategy for the bioremediation of chronically hydrocarbon-polluted soils.