Complex restoration of oil-contaminated soils with new organomineral reagents
The effectiveness of the treatment of oil-contaminated soil with organomineral reagents containing activated Rau-85 aluminum alloy, which makes it possible to reduce the concentration of ethoxins and neutralize the effects of oil and oil products on the soil, has been evaluated. Humic and fulvic acids were used as organomineral reagents. Organomineral reagents were characterized by FT-IR absorption spectra, as well as by thermogravimetric analysis methods. It has been established that complex compounds are formed during the interaction of humic acid with activated aluminum alloys. The peak in the region from 2100-2400 cm-1 is typical for the complex compound of aluminum with humic acids. The physicochemical properties of the oil-contaminated soil were studied, the morphological and structural features were characterized, as well as the surface elemental composition of the soil before and after treatment. The desorption of crude oil from the soil using the Rau-85 alloy and its complex with humates was confirmed by SEM and EDX methods. A decrease in the concentration of oil by 22.6% was revealed after the treatment of soils with Rau-85 alloys. The use of the Rau-85 alloy complex and organomineral fertilizer demonstrated a decrease in oil concentration by 12.18% and the germination of seeds of the legume family on the 7th day after sowing, and on the 14th day - active growth. The combination of Rau-85 alloy and organo-mineral fertilizer can be used as an effective soil washing agent for crude oil components, which is an effective solution for remediation of oil-contaminated soil.