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From bioavailability science to soil bioremediation: Sustainable stimulation of biological degradation for enhanced removal of PAHs

AutorOrtega Calvo, J. J. ; Posada Baquero, Rosa ; Jiménez Sánchez, Celia ; García Fernández, José Luis ; Cantos, Manuel
Fecha de publicación6-nov-2016
EditorSociety of Environmental Toxicology and Chemistry
Citación7th SETAC World Congress/SETAC North America 37th Annual Meeting (2016)
ResumenPolycyclic aromatic hydrocarbons (PAHs) are the best representatives of chemicals for which specific limitations in bioremediation exist due to low bioavailability. The residual concentrations of the PAHs after bioremediation are crucial because they may limit the use of the area after treatment, or land use might not even be possible if the residual concentrations do not meet the legal requirements. For bioavailability to be incorporated into soil bioremediation, three questions must be addressed: (1) how is “bioavailability” defined? (2) how should it be measured? and (3) is it possible to increase bioavailability but not environmental risk of the pollutants? Over the last 30 years, numerous publications have discussed the concepts and definitions of bioavailability of organic chemicals (Environ. Sci. Technol. 49:10255-10264, 2015). The main schools of thought consider bioavailability (focusing on the aqueous or dissolved contaminant), bioaccessibility (incorporating the rapidly desorbing contaminant in the exposure), and chemical activity (determining the potential of the dissolved contaminant for biological effects). These concepts are the basis for different methodologies (desorption extraction, passive sampling and biological tests) and mechanistic studies that consider the different processes that are involved (contaminant soil/sediment interactions, transport and passage across cell membrane, and biological responses such as toxic effects or biodegradation). Our group has proposed different ways to operate at different levels on these processes, in the context of biodegradation of PAHs, for a better bioremediation performance in risk reduction. The approach is relevant because in some circumstances ioremediation may even increase risk of PAHs
Versión del editorhttps://orlando.setac.org/wp-content/uploads/2016/10/SETAC-Orlando-Abstract-Book.pdf
URIhttp://hdl.handle.net/10261/159025
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