Rhizosphere-enhanced biosurfactant action on slowly desorbing PAHs in contaminated soil

The Science of the Total Environment
Rosa Posada-BaqueroJose Julio Ortega-Calvo

Abstract

We studied how sunflower plants affect rhamnolipid biosurfactant mobilization of slowly desorbing fractions of polycyclic aromatic hydrocarbons (PAHs) in soil from a creosote-contaminated site. Desorption kinetics of 13 individual PAHs revealed that the soil contained initially up to 50% slowly desorbing fractions. A rhamnolipid biosurfactant was applied to the soil at the completion of the sunflower cycle (75 days in greenhouse conditions). After this period, the PAHs that remained in the soil were mainly present in a slowly desorbing form as a result of the efficient biodegradation of fast-desorbing PAHs by native microbial populations. The rhamnolipid enhanced the bioavailable fraction of the remaining PAHs by up to 30%, as evidenced by a standardized desorption extraction with Tenax, but the enhancement occurred with only planted soils. The enhanced bioavailability did not decrease residual PAH concentrations under greenhouse conditions, possibly due to ecophysiological limitations in the biodegradation process that were independent of the bioavailability. However, biodegradation was enhanced during slurry treatment of greenhouse planted soils that received the biosurfactant. The addition of rhamnolipids caused a dramatic s...Continue Reading

Citations

Jun 11, 2020·International Journal of Environmental Research and Public Health·Marie DavinGilles Colinet
Nov 28, 2020·The Science of the Total Environment·Carmen Fernández-LópezJose Julio Ortega-Calvo
Mar 13, 2021·Environmental Pollution·Marie DavinMarie-Laure Fauconnier

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