The effect of an anionic surfactant on the mobilization and biodegradation of PAHs in a creosote-contaminated soil

Abstract

The mobilization and biodégradation of 13 PAHs sorbed in a creosote-contaminated soil were assessed in the presence of sodium dodecyl sulphate (SDS). In a mobilization experiment, the soil was mixed with SDS solutions (0.005 to 1 % w/v) and the PAH concentrations in the aqueous phase were determined. In a biodégradation experiment, soil residual PAH concentrations were monitored during 45 weeks in the presence of 10, 100 and 500 mg kg" 1 SDS. The SDS was effective in mobilizing three-and four-ring PAHs. Increasing SDS concentration resulted in the mobilization of very low water-soluble five-and six-ring PAHs. The SDS (100 and~ 500 mg kg 4 ) significantly decreased the biodégradation of fluorene, phenanthrene and all of the four-ring PAHs. PAHs with more than four rings were not biodegraded. The surfactant [a 14 C]SDS was readily biodegraded. Even if SDS may be efficient in mobilizing PAHs in soil pore water or groundwater, it will not improve PAH biodégradation. Such a result must be considered when using anionic surfactants in the perspective of biological treatment of PAHs. Effet d'un agent tensio-actif anionique sur la mobilisation et la biodégradation de HAP présents dans un sol contaminé par la créosoteRésumé La mobilisation et la biodégradation de 13 HAP adsorbés sur un sol contaminé par la créosote ont été étudiées en présence de dodecyl sulphate de sodium (DSS). Pour la mobilisation, le sol a été mélangé avec des solutions de DSS (0.005 à 1 % p/v) et la concentration des HAP a été mesurée en phase aqueuse. Pour la biodégradation, les concentrations résiduelles de HAP dans le sol ont été mesurées durant 45 semaines en présence de 10,

Application of vegetable oils in the treatment of polycyclic aromatic hydrocarbons-contaminated soils

“…Deschênes et al [70] also reported that rhamnolipids could enhance the solubilisation of 4-ring PAHs more significantly than 3-ring PAHs and with efficiencies 5 times higher than the anionic surfactant sodium dodecyl sulfate (SDS). Moreover, the uptake of biosurfactantsolubilised molecules was measured to be faster than the uptake of truly dissolved (i.e.…”

An Alternative Approach of Toxic Heavy Metal Removal by <i>Arthrobacter phenanthrenivorans</i>:Assessment of Surfactant Production and Oxidative Stress

“…Several studies have reported the applications of surfactant in various fields, such as oil removal in petroleum industries, water treatment and pharmaceutical sectors 19 . According to Deschenes et al 20 , biosurfactants are more effective than chemical surfactants like SDS in polycyclic aromatic hydrocarbon solubilization.…”

Enhanced Bioremediation of Polycyclic Aromatic Hydrocarbons by Environmentally Friendly Techniques

“…It has been suggested that surfactants at low concentrations may be useful for in situ bioremediation of many sites (151,152) but there has been insufficient study of this in soils. Deschênes' study (153) has shown that SDS is quite effective in increasing the concentration of PAHs in the aqueous phase, suggesting that this surfactant might be used for ground soil washing or for in situ treatment to recover these compounds. In fact, the results also showed that increasing SDS concentration resulted in the mobilization of toxic high molecular weight PAHs such as BaP.…”