Présentations Colloques

    Oral Presentation
    Session 5.04: Emerging contaminants in the water cycle and risk to Groundwater
    Merce Boy-roura
    Spatial and temporal evolution of antibiotics in the Baix Fluvi? alluvial aquifer and its impact on groundwater resources quality
    Emerging Organic Contaminants (EOCs) occurrence and migration in groundwater has become a great environmental concern. This study looks forward describing EOCs, especially veterinary antibiotics, behavior in an alluvial aquifer (Baix Fluvià, NE Spain) in order to propose strategies for water resources quality assessment and management.**A total of 56 water samples were collected (groundwater, 47+ Fluvià River, 7+ and WWTP effluents, 2) in an exploratory survey during spring 2015. Samples were analyzed for hydrochemical, isotopic and EOCs analysis. A monthly sampling campaign of 8 representative wells and 2 surface water locations was conducted during the following year to evaluate EOCs temporal evolution and its relationship with the hydrodynamics of the aquifer.**Preliminary results show the dynamics of the hydrogeological system is controlled by the surface-groundwater interaction in the areas nearby the Fluvià River, whereas, marginal areas have distinct hydrochemical features. A total of 14 different antibiotics were found corresponding to six different groups- fluoroquinilones, lincosamides, macrolides, quinolones, sulfonamides and tetracyclines.**No clear and continuous spatial concentration trend of EOCs has been observed in the aquifer. Even though EOCs concentrations in groundwater are not very high (order of ng L), the widespread occurrence of veterinary antibiotics detected in the Baix Fluvià aquifer is mainly attributed to diffuse pollution from agriculture due to the use of organic fertilizers, and to the hydrological mixing between stream water and groundwater in a complex flow field during the irrigation season. Moreover, no clear relationship between nitrate pollution and presence of antibiotics has been observed. While nitrate concentrations in groundwater tend to be relatively stable over time, significant changes in EOCs concentration are observed in most of the wells. We anticipate that differences in manure EOC composition, soil adsorption and mixing due to flow field alterations caused by distinct groundwater withdrawal regimes at each well may largely influence antibiotic composition of groundwater resources.**Acknowledgements- This study is funded by the EU project PERSIST-JPIW2013-118 and the Spanish project CGL2014-57215-C4-2-R.


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