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CHEMICAL AND BIOLOGICAL TREATMENT OF A DIESEL CONTAMINATED SOIL
Abstract
Organic contaminants such as total pe troleum hydrocarbons, including aliphatic hydrocarbons, polycyclic aromatic hydrocarbon s and BTEX are recognized as one of the predominant pollutants within Romanian contaminated sites. This study presents a set of experiments for the remediation of a soil contaminated accidentally with petroleum products conducted in slurry-type batch systems, designed to establish the best remediation approach. The experime ntal variants consisted in biological remediation (natural attenuation and enhanc ed bioremediation with nutrient addition) and chemical treatment using two different oxidants: sodium peroxidisulphate (activated with Fe 2+ and non activated) and sodium percarbona te. By the end of the biological experiment only 22 % of TPH was degraded after 6 weeks, in case of C and N addition, compared with 15% in case of no-addition ex periment; this suggests that a much longer time for TPH complete degradation to CO2 a nd H2O is necessary in real environment. The analysis of chemical oxida tion using different oxidants, at different concentrations showed that sodium persulphate, at the test ed concentration of 16.5 g/kg d.w., was the most efficient oxidant and dose, 60% of TP H being oxidized in soil by the end of the experiment. Higher oxidant concentrations have not been tried. Considering this specific soil sample used, the TPH pollution level and the natural organic matter content, sodium peroxidisulphate oxidation followed by biodeg radation (natural attenuation) seems the best combination.
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References8
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