[en] Contaminants of emerging concern (CECs) present in runoff pose risks to groundwater quality during their infiltration. Understanding the processes that control their attenuation is therefore essential for designing effective mitigation strategies. This research investigates the attenuation capacity of loess sediments overlaying a major Cretaceous chalky aquifer in Belgium, as part of a pre-feasibility study of soil aquifer treatment (SAT) system using airport runoff. In particular, the study aims to assess the natural ability of these sediments to filter and biologically degrade detected contaminants in airport runoff, thereby reducing their concentrations to levels compliant with water quality standards. Controlled batch experiments were thus conducted to analyze the sorption and biodegradability of key CECs, including PFAS, alkylphenols and benzotriazoles. The experiments were performed in triplicate using batch reactors filled with sediments and synthetic runoff. An abiotic control was included to distinguish between sorption and biodegradation. Results revealed distinct attenuation behaviours. Nonylphenol diethoxylate showed the highest removal, driven entirely by biodegradation with no contribution from sorption. Benzotriazole, tolyltriazole, PFOS, and 6:2 FTS showed moderate attenuation, primarily due to sorption for PFAS compounds. The remaining PFAS, - PFOA, PFHxA, and PFECHS - exhibited low attenuation, limited by sorption and no biodegradation. These findings confirm that loess sediments can reduce loads of certain CECs and also highlight the persistence of PFAS in water during infiltration. The results provide critical parameters for modeling CECs transport during SAT operations and support the safe management of airport runoff as a recharge source.
Research Center/Unit :
IDAEA-CSIC, Groundwater and hydrogeochemistry
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Glaude, Robin ; Université de Liège - ULiège > Urban and Environmental Engineering
Brouyère, Serge ; Université de Liège - ULiège > Urban and Environmental Engineering
WBI - Wallonie-Bruxelles International ERDF - European Regional Development Fund MICINN - Ministerio de Ciencia, Innovación y Universidades AEI - Agencia Estatal de Investigación MICINN - Ministerio de Ciencia e Innovacion F.R.S.-FNRS - Fonds de la Recherche Scientifique
Funding text :
The experimental work of this research was supported by MCIU/AEI/ 10.13039/501100011033 and FEDER \u201C one way to make Europe \u201D through the grant PID2021-128995OA-I00 . Furthermore, the Spanish Ministry of Science and Innovation is acknowledged for financial support [ PID2022-137766NB-I00 ] of mass spectrometry equipment.The experimental work of this research was supported by MCIU/AEI/10.13039/501100011033 and FEDER \u201Cone way to make Europe\u201D through the grant PID2021-128995OA-I00. Furthermore, the Spanish Ministry of Science and Innovation is acknowledged for financial support [PID2022-137766NB-I00] of mass spectrometry equipment.Robin Glaude is a beneficiary of the ASP-REN fellowship supported by the FNRS (Fonds de la Recherche Scientifique) Belgium. In addition, he was awarded a mobility grant (SOR/2023/550158) by WBI (Wallonie-Bruxelles International) to carry out batch experiments in Barcelona, Spain.Robin Glaude is a beneficiary of the ASP-REN fellowship supported by the FNRS (Fonds de la Recherche Scientifique) Belgium. In addition, he was awarded a mobility grant ( SOR/2023/550158 ) by WBI (Wallonie-Bruxelles International) to carry out batch experiments in Barcelona, Spain.
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