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The colloid hematite particle migration through the unsaturated porous bed at the presence of biosurfactants

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Abstract

Colloidal particles have an ability to sorb heavy metals, metalloids, and organic compounds (e.g. biosurfactants) present in soil and groundwater. The pH and ionic strength changes may promote release of such particles causing potential contaminant transport. Therefore, it is very important to know how a colloid particle-mineral particle and colloid-mineral-biosurfactant system behaves in the natural environment. They can have negative impact on the environment and human health. This study highlighted the influence of biosurfactants produced by Pseudomonas aeruginosa on the transport of colloidal hematite (α-Fe2O3) through porous bed (materials collected from the Szklary and Zloty Stok solid waste heaps from Lower Silesia, Poland). Experiments were conducted using column set in two variants: colloid solution with porous bed and porous bed with adsorbed biosurfactants, in the ionic strengths of 5 × 10−4 and 5 × 10−3 M KCl. The zeta potential of mineral materials and colloidal hematite, before and after adsorption of biosurfactant, was determined. Obtained results showed that reduction in ionic strength facilitates colloidal hematite transport through the porous bed. The mobility of colloidal hematite was higher when the rhamnolipid adsorbed on the surface of mineral grain.

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Acknowledgements

The work was financed by a statutory activity subsidy from the Polish Ministry of Science and Higher Education for the Faculty of chemistry of Wroclaw University of Science and Technology.

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Correspondence to Agnieszka Pawlowska.

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Responsible editor: Guilherme L. Dotto

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Pawlowska, A., Sznajder, I. & Sadowski, Z. The colloid hematite particle migration through the unsaturated porous bed at the presence of biosurfactants. Environ Sci Pollut Res 24, 17912–17919 (2017). https://doi.org/10.1007/s11356-017-9435-1

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  • DOI: https://doi.org/10.1007/s11356-017-9435-1

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