Geochemical Evaluation of the Effectiveness of the Biopreparation "Lenoil"®-Nord for the Treatment of Oil-Contaminated Soils in the Arctic

Using geochemical methods in the process of experimental research, the possibility of using the biological preparation “Lenoil” ®-NORD, SHP for cleaning soils from oil pollution in the Arctic conditions was studied. The effectiveness of the biological preparation was assessed. Tests of the biological preparation were carried out in a model soil system under laboratory, also field conditions on the territory of the Norilsk industrial region. It was established that in tests the degree of destruction in 60 days at different concentrations of added diesel fuel (1% and 5%) was 67 % and 86 %, respectively. In a field experiment for 38 days the cleaning efficiency was 53 %. Changes occurred in the group composition of soil extracts: the proportion of hydrocarbon components decreased significantly, the content of resins and asphaltenes increased, and the amount of oxygen-containing compounds in their chemical structure increased. Such changes indicate biochemical oxidation of petroleum components. It was established that in 38 days the residual oil products content in soils remained high at 12430 mg/kg. This requires continued cleanup work and further monitoring of the remediation of oil-contaminated Arctic soils.