USING OF THE MATHEMATICAL PLANNING OF THE EXPERIMENT FOR THE QUANTITATIVE ASSESSMENT OF THE METHOD OF PHYTOREMEDIATION RESTORATION OF SOILS CONTAMINATED WITH PETROCHEMICALS

Abstract

Nowadays, the problem of soil contamination with oil products has global character. The issue of soil quality is particularly acute in technogenically loaded territories, which, in particular, include the territories of airports. To reduce the negative impact of petrochemicals on the condition of the soils and to restore their quality characteristics, various methods of destruction of petroleum hydrocarbons in contaminated soils are used. In recent years, biological methods of cleaning soils from oil products are gaining more and more popularity. These methods have a number of advantages over physic-chemical and mechanical methods of restoring the quality of the soils contaminated with petrochemicals. However, the most popular is the phytoremediation method. In our research, we have chosen this method of cleaning soils contaminated with aviation fuel, as it is one of the most ecologically safe, cost-effective, accessible and promising of the existing methods of restoring the quality of soils contaminated with petroleum products. The purpose of the work was to evaluate the use of phytoremediation to restore the quality characteristics of soil contaminated with aviation fuel, using the method of mathematical planning of the experiment, namely the method of full factorial experiment, which allows obtaining a statistical model of the influence of the factors involved, namely the presence of plants and petroleum products. To achieve the goal, the phytoremediation technology of soil samples artificially contaminated with TS-1 aviation kerosene was applied. The plants chosen for the study were oats (Avena Sativa L.) and timothy (Phleum L.). The change in the level of phytotoxicity of the soil samples after the application of phytoremediation technology was determined using a growth test with watercress (Lepidium sativum).
 The obtained data showed that on the 10th day of observation, the negative impact of aviation fuel (X2) and the positive impact of plants (X1) is observed. At the same time, strengthening the positive impact of plant action and reducing the negative impact of aviation fuel in the interaction of these two factors X1 and X2. Analyzing the obtained results, we can draw a conclusion about the possibility of using the technology of phytoremediation of oil-contaminated soils, which is quantitatively evaluated using the method of a full factorial experiment.