DBPapers
DOI: 10.5593/sgem2011/s16.109

CHEMICAL AND BIOLOGICAL TREATMENT OF A DIESEL CONTAMINATED SOIL

AUTHOR/S: C. BUMBAC, D. DOBRE, CR. COSMA
Monday 1 August 2011 by Libadmin2011

11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 2, 1117-1123 pp

ABSTRACT

Organic contaminants such as total petroleum hydrocarbons, including aliphatic
hydrocarbons, polycyclic aromatic hydrocarbons 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 experimental variants consisted in biological
remediation (natural attenuation and enhanced bioremediation with nutrient addition) and chemical treatment using two different oxidants: sodium peroxidisulphate (activated with Fe2+ and non activated) and sodium percarbonate. 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 experiment; this suggests that a much longer time for TPH complete degradation to CO2 and H2O is necessary in real environment.
The analysis of chemical oxidation using different oxidants, at different concentrations showed that sodium persulphate, at the tested concentration of 16.5 g/kg d.w., was the most efficient oxidant and dose, 60% of TPH 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 biodegradation (natural attenuation) seems the
best combination.

Keywords: diesel, soil remediation, oxidation, bioremediation

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