Biodegradation of engine oil in soil

Laboratory experiments were conducted with the aim of bioremediation of sandy soil from engine oil in 5% concentration. Bacterial strains, active in degrading oil hydrocarbons as a sole source of carbon and energy were selected and identified. Optimal parameters, such as concentration of inorganic nutrients (expressed as C:N and C:P ratio) and the size of inoculum were established in experiments on 1% engine oil biodegradation. Process enhancing role of surfactants addition, the application of immobilized biomass and reinoculations was also evaluated.