DYNAMIC OF PETROLEUM HYDROCARBON CONCENTRATION IN SOIL POLLUTED WITH CRUDE OIL PUBLISHEDMariana MARINESCU, Anca LACATUSU, M. DUMITRU, M. MARINESCU
Once with the establishment of the first human communities, with socio-economic development start, with exacerbation of the industrial and post-industrial revolution, etc., people, not content with nature itself, with his intelligence and creative spirit, started to adapt and transform it according to his needs. Unfortunately, there are harmful secondary effects of human activity, becoming more frequent and aggressive, some completely unforeseen and even irreversible impacts on environmental quality, plant and animal life, even on people existence. All this led to the appearence, development and progression in an accelerated rhythm of a phenomenon very new, very complex and more extensive and dangerous identified, on a global scale, by all countries and continents , as environmental pollution. Pollution is any undesirable change in physical, chemical and biological characteristics of water, air and soil that can affect harmful health, survival or activities of humans or other living organisms, whose term for clearer understanding is necessary to take into account also, the term "contamination", which refers to the presence, no matter the quantity of elements or unwanted hazardous substances in water, air or soil due to human activities that definitely are not harmful. The e xperimental scheme included two groups of experimental variants in which the soil was polluted by 5% and 10% crude oil. For each concentrations of crude oil were created 4 experimental variants, achieved by conditioning the soil with Ecosol in two doses, with or without inoculation with selected bacteria. Bioremediation protocol focused on the application of the two major technologies known in bioremediation method such as: soil biostimulation based on environmental conditions improvement for microorganisms multiplication and activity to degrade petroleum hydrocarbons, and bioaugmentation based on enriching the soil with specific biodegrading hydrocarbons microorganisms. The efficiency of bioremediation process in optimal variants was 92.6% in case of soil polluted with 5% crude oil and 80.5% for excessively polluted soil with 10% crude oil.
bioremediation, crude oil, soil pollution, total petroleum hydrocarbons