INVESTIGATION OF PURIFICATION PROCESS OF OIL-CONTAMINATED SOILS.

The work deals with the purification process of the oil-contaminated soils. Methods of intensification of molecular surface phenomena when exposed to oil-polluted soil were shown. Removal of the oil pollutant from the surface of mineral particles is a result of a complex action of molecularsurface phenomena (selective wetting, surface energy gradient) and mechanical forces of the aqueous solution flow. In order to increase the efficiency of their purification, the work considers methods of enhancing the molecular-surface interaction phenomena effect on oil pollutant of contaminated soils. Our experiments revealed interfacial surface tensions that drop on the oil-water interface during the dilution process with an organic solvent. The organic solvent used in the process dissolves the oil contaminant, reducing its viscosity many times and formed the optimum concentration of surfactants in the oil pollutant. It found that the organic solvent and non-ionic aqueous surfactant solutions, as well as alkaline medium reduced interfacial surface tensions that lead to the enhancement of molecular-surface interaction phenomena effect on the oil pollutant of contaminated soils and raise effectiveness of their cleanup. [ABSTRACT FROM AUTHOR]