INVESTIGATION OF SORPTION OF SOME CHLORINATED POLLUTANTS ON SOIL IN OIL CONTAMINATED SYSTEMS BY STATIC AND DYNAMIC METHODS

In order to evaluate the potential risk generated by oil contaminated landfill leachates passing through soil, batch and column experiments were performed with reference systems consisting of standard soils and synthetic leachates. sorption studies were carried out with hexachlorocyclohexane-isomers and hexachlorobenzene. The sorption behaviour was studied in aqueous systems containing the compounds at concentrations between 200 ppb and 1 ppm and various oil concentrations. The batch experiments showed isomer specific absorption of the hexachlorocyclohexanes in the systems without oil, the adsorption levels ranging at 50% for alpha- and gamma-BHC (benzene hexachloride) and at 70% for beta- and delta-BHC. Concerning the column experiments, isomer specific breakthrough was observed analogously. The experiments showed a significant influence of oil on the sorption of the components. The batch experiments showed a drastic decrease of adsorption down to 10% for all of the compounds at oil contents of 2-3%, the column experiments showed significant change of the breakthrough behaviour of the components at 0,2% of oil.