USAGE OF PLANTS FOR FAT-POLLUTED SOIL TREATMENT

Following the complex technology for greasy waste utilization, which is under development, two stages of fat degradation - biodegradation and phytoremediation - were applied for treatment of fat-polluted soil. Biodegradation was used in the first stage, and phytoremediation was applied for degradation of residual fat and final restoration of soil structure. The latter technology was used to evaluate the ability of three following species of herbaceous plants to degrade fat in soil: red clover (Trifolium pratense L.), meadow fescue (Festuca pratensis Huds.), and hybrid ryegrass (Lolium hybridum Hausskn.). The evaluation after the stages of phytoremediation showed that hybrid ryegrass was the most effective in fat degradation in soils with high initial fat concentrations (100 g/kg and 55.1 g/kg), i.e. 53% and 67% respectively. With lower initial fat contents in soil (up to 12.7 g/kg), the best ability in fat degradation was determined in hybrid ryegrass and red clover, i.e. 76%. Application of stages of biodegradation and phytoremediation for treatment of soil polluted with greasy contaminants helped to reduce fat contents by 99% with the initial fat concentration of 138.9 g/kg, and 90% with 222.2 g/kg.