The BIOREMEDIATION OF SOIL CONTAMINATED WITH PETROLEUM PRODUCTS

The article deals with the cleaning of soils contaminated with petroleum products with Bakoil-KZ biopreparation made on the basis of hydrocarbon-oxidizing microorganisms. As a result, the content of petroleum products in the soil decreased from 67.8% to 97.2%, and it was found that the most effective option for cleaning the soil is a variant of the biological preparation Bakoil-KZ 2g/kg. After cleaning the soil from petroleum products, a morphological analysis of the cleaned soil was carried out and biotesting was carried out using watercress to determine the phytotoxicity of the soil. As a result, the biotesting indicators complemented the results of previous studies, and the variant with Bakoil-KZ (2g/kg) did not show any toxic properties, i.e. the soil was completely bioremediated. In the variants with the addition of Bakoil-KZ (1g/kg), the seeds germinated by 84-82%, in the variants with Bakoil-KZ (5g/kg), the seeds germinated by 88-90% and showed some purification of the soil from petroleum products. A total of 19-23 copies (38-46%) of seeds germinated in polluted soil, soil without the addition of biological products. From this we can see that the process of self-purification occurs in nature, but it occurs very slowly and cannot completely clean the soil heavily contaminated with petroleum products.

It has been established that the use of a drug created on the basis of such microorganisms is environmentally harmless, prevents environmental disasters, consumes less, it is possible to clear the land area on various scales, and there will be no harm when such purified soil is returned to the ecosystem.