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The study was performed of the bioremediation efficiency of the soil contaminated with oil (20 to 100 g/kg), petroleum (20 to 60 g/kg) and diesel fuel (20 to 40 g/kg) with the help of earthworms Dendrobena veneta in the presence of bacteria Pseudomonas, nitrogen fixing bacteria Azotobacter and Clostridium, yeasts Saccharomyces, fungi Aspergillus and Penicillium, as well as Actinomycetales, all being components of biopreparation Baykal-EM. It was demonstrated that in oil-contaminated soil, the content of hydrocarbons decreased by 95% after 22 weeks in the presence of worms and bacteria. The microbiological preparation introduction increased the earthworms survivability in oil-contaminated substrate. The microbiological preparation introduction, therefore, allowed to use Dendrobena veneta for soil recultivation with higher oil concentrations that was impossible in the past. In petroleum-contaminated soil the content of hydrocarbons decreased by 97% after 22 weeks months. The presence of the diesel fuel in the amount of 40 g per 1 kg soil had an acute toxic effect and caused the death of 90% earthworm species in 14 days. Bacteria introduction enhanced the toxic effect of the diesel fuel and resulted in the death of 100% earthworms after 7 days. All studies demonstrated high survivability level for D. veneta in oil contaminated samples with added biopreparation Baykal EM-1, though in the field study the level was lower due to the substrate composition, and absence of additional nutrients and aeration. The oil content decreased more intensely in the soil samples containing earthworms as compared to the samples without earthworms. The decomposition efficiency and the rate of oil hydrocarbons removal depended on the oil content and the presence or absence of biopreparation Baykal EM-1. The highest decomposition rate was registered in the sample with oil concentration of 40 g/kg. The obtained results are statistically important and demonstrate that microorganisms of biopreparation Baykal EM-1 have a positive effect on the earthworms' survival, their reproductive potential, and hydrocarbons degradation.

iop conference series. earth and environmental science

The recultivation of the soils, contaminated with petrol and diesel fuel, with the help of earthworms Dendrobena veneta and the complex of microorganisms