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Utilization of a biosurfactant foam/nanoparticle mixture for treatment of oil pollutants in soil

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Abstract

Oil contamination has become a primary environmental concern due to increased exploration, production, and use. When oil enters the soil, it may attach or adsorb to soil particles and stay in the soil for an extended period, contaminating the soil and surrounding areas. Nanoparticles have been widely used for the treatment of organic pollutants in the soil. Surfactant foam has effectively been employed to remediate various soil contaminants or recover oil compounds. In this research, a mixture of biosurfactant foam/nanoparticle was utilized for remediation of oil-contaminated soil. The results demonstrated that the biosurfactant/nanoparticle mixture and nitrogen gas formed high-quality and stable foams. The foam stability depended on the foam quality, biosurfactant concentration, and nanoparticle dosage. The pressure gradient change in the soil column relied on the flowrate (N2 gas + surfactant/nanoparticle mixture), foam quality, and biosurfactant concentration. The optimal conditions to obtain good quality and stable foams and high oil removal efficiency involved 1 vol% rhamnolipid, 1 wt% nanoparticle, and 1 mL/min flowrate. Biosurfactant foam/nanoparticle mixture was effectively used to remediate oil-contaminated soil, whereas the highest treatment efficiency was 67%, 59%, and 52% for rhamnolipid biosurfactant foam/nanoparticle, rhamnolipid biosurfactant/nanoparticle, and only rhamnolipid biosurfactant, respectively. The oil removal productivity decreased with the increase of flowrate due to the shorter contact time between the foam mixture and oil droplets. The breakthrough curves of oil pollutants in the soil column also suggested that the foam mixture’s maximum oil treatment efficiency was higher than biosurfactant/nanoparticle suspension and only biosurfactant.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

The authors would like to acknowledge the financial support of the Natural Sciences and Engineering Research Council (NSERC) of Canada, NSERC PURE Create program, and Concordia University.

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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by KAV. The first draft of the manuscript was written by KAV, and both authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Catherine N. Mulligan.

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The authors declare no competing interests.

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Responsible Editor: Kitae Baek

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Vu, K.A., Mulligan, C.N. Utilization of a biosurfactant foam/nanoparticle mixture for treatment of oil pollutants in soil. Environ Sci Pollut Res 29, 88618–88629 (2022). https://doi.org/10.1007/s11356-022-21938-9

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  • DOI: https://doi.org/10.1007/s11356-022-21938-9

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