EVOLUTION IN TIME OF SOME CHEMICAL AND MICROBIOLOGICAL SOIL CHARACTERISTICS UNDER THE IMPACT OF OIL AND PETROLEUM PRODUCTS POLLUTED SOILS ELECTRO REMEDIATION TECHNOLOGIES

Soil chemical and microbiological characteristics variations in time were studied in the frame of a project aiming to elaborate a platform for oil pollution risk assessment, during an electro remediation process. On the background of very slight variations of the soil macro-elements contents different organic carbon and total nitrogen contents accumulation are registered at the electrodes, under the influence of potential difference and other factors as well. Nitrates contents register a great leap in the last stage of the experiment due to weather conditions but remain within the normal agricultural soils limits. Mobile phosphorus and potassium contents vary insignificantly within the limits of a good agricultural soils supply. The reaction remained slightly alkaline all along the experiment with a slight pH increasing tendency. All the samples have a chloride salinisation with slight and moderate intensities and sodium chloride is predominant in their composition. The bacteria numbers increased in some of the collecting pits and decreased in the others.