Evaluation of surfactant-solvent mixtures for bioremediation of contaminated soil
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Abstract
Among various technologies for the remediation of contaminated soils with diesel, bioremediation and soil washing emerges as effective alternatives, in both treatments can be applied surfactants. These surfactants can act in synergy with other substances, which is demonstrated through of surface tension analyses. Individual surfactants and formulations were assayed, in order to find the ideal mixture. Once it was chosen the effect of a surfactant-solvent mixture was studied. Two treatments were evaluated in a soil contaminated with diesel at a concentration of 5,950 mg kg-1 of total petroleum hydrocarbons, the first treatment corresponds to soil washing and the second was a biological treatment. The best results were obtained with mixture Tween 80 with D-Limonene with the highest concentration studied (10,000 mg kg-1) for soil washing, achieving 80% of removal. However, for bioremediation better results were obtained with the lowest doses tried (2 mg kg-1) with a 78.6% of removal for 50 days. When mixtures of surfactants were used (or added) in soil washing and bioremediation an increase of 60 and 25% of removal was achieved respectively, in comparison without. Therefore, results obtained in this study permit to argue that desorption and removal is improved in both systems. In addition there was a better efficiency by removing the oil by soil washing and facilitated the solubility and bioavailability of petroleum compounds in the case of biological treatment.
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