Use of Silicon Dioxide Encapsulation Method for Restoration of Oil-Polluted Soils

Keywords: oil products, soil, hydrocarbons, silicon dioxide, encapsulation

Abstract

Purpose. Approbation of the method of encapsulation of silicon dioxide to restore the biological value of oil-contaminated soil.

Methods. The encapsulating solution was prepared using sodium silicate (7% w. / vol.) as the main component and a synthetic surfactant (sodium dodecyl sulfate). To restore the contaminated soil, a treatment solution ratio of 1:1, 1:2, 1:3 and 1:4 was used for sodium silicate and sodium dodecyl sulfate, respectively. Phytotoxicity of oil-contaminated soil was determined by biotesting aqueous extracts from the soil.

Results. The most optimized for use from the studied ratios of substances is a solution consisting of 2 parts: sodium silicate and sodium dodecyl sulfate. The lowest phytotoxic effect (17%) was recorded at pH of 5 of the treated soil and the ratio of solution components 1:2 (sodium silicate / sodium dodecyl sulfate).  In the experiments, 2 species of monocotyledons (oats, corn) and 2 species of dicotyledonous plants (lettuce, black radish) were used.  

Conclusions. The technology of encapsulation of silicon dioxide in the treatment of oil-contaminated soils with a solution of sodium silicate and sodium dodecyl sulfate is quite economically attractive. The material formed as a result of the encapsulation process dries, forming an amorphous silica material, within which, in our opinion, hydrocarbons and heavy metals accumulate, but further research is needed for such a statement.

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Author Biographies

O. M. Krainiukov, V. N. Karazin Kharkiv National University, 6, Svobody sqr., 61022, Kharkiv, Ukraine

DSc (Geography),  Professor, Professor of the Department of Environmental Safety and Environmental Education

I. A. Kryvytska, V. N. Karazin Kharkiv National University, 6, Svobody sqr., 61022, Kharkiv, Ukraine

 Associate Professor at the Department of Environmental Safety and Environmental Education

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Published
2020-11-23
How to Cite
Krainiukov, O. M., & Kryvytska, I. A. (2020). Use of Silicon Dioxide Encapsulation Method for Restoration of Oil-Polluted Soils. Visnyk of V. N. Karazin Kharkiv National University. Series Еcоlogy, (23), 50-56. https://doi.org/10.26565/1992-4259-2020-23-05

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