Conditions for effective removal of pyrene from an artificially contaminated soil using Pseudomonas aeruginosa 57SJ rhamnolipids.
The efficacy of a new rhamnolipid biosurfactants mixture to enhance the removal of pyrene from a soil artificially contaminated was investigated. The molar solubilization ratio (MSR) and the partition coefficient between the micelles and water (log K(m)) were found to be 7.5 x 10(-3) and 5.7, respectively. From soil column studies, the pyrene removal increased linearly with the concentration of the injected biosurfactants solution above the effective critical micellar concentration (0.4 g L(-1)). Flushing with a 5.0 g L(-1) biosurfactants solution increased the pyrene concentration in the effluent by 178 times. At high biosurfactants' concentrations (2.5 and 5.0 g L(-1)), the cumulative pyrene recovery reached 70%. This pyrene remobilization takes place independently of the soil organic carbon solubilization. This study provides a combination of batch and column experiments in order to find the conditions for effective soil remediation using a new rhamnolipids mixture.
Bordas
François
F
Institut national de la recherche scientifique, Centre INRS-Eau-Terre-Environnement, Université du Québec, 2800 rue Einstein, C.P. 7500, Sainte-Foy, Québec, Canada, G1V 4C7. francois.bordas@unilim.fr
Lafrance
Pierre
P
Villemur
Richard
R
D001673:Biodegradation, Environmental; D006017:Glycolipids / Q000737:chemistry; D008823:Micelles; D011550:Pseudomonas aeruginosa; D011721:Pyrenes / Q000737:chemistry; D012988:Soil Microbiology; D012989:Soil Pollutants
D006017:Glycolipids; D008823:Micelles; D011721:Pyrenes; D012989:Soil Pollutants; C418382:rhamnolipid; C030984:pyrene