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Communication Dans Un Congrès Année : 2023

New lysimetric experiments to assess the effect of water table-level variations on the fate of petroleum hydrocarbon pollutants (LNAPL) in soils in the climate change context

Fabrice Golfier
Anne-Julie Tinet
Constantin Oltean
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Dorian Davarzani
Catherine Lorgeoux
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  • PersonId : 1127449
Noële Enjelvin

Résumé

In the last decades, the pressure exerted on soil and water resources rises due to human activities and climate change, threatening their long-term quality by contaminations and extreme events (IPCC, 2021). To improve contamination management in a climate change context, a better assessment of the effect of the climate-related factors (temperature, precipitation, and seasonal groundwater level variation patterns) on the fate of groundwater and soil pollutants must be better considered. For example, groundwater seasonal level variations and the temperature seems to influence the fate of light non-aqueous petroleum liquids (LNAPLs, ex: diesel fuel) in contaminated soils, affecting their volatilization, dissolution, and biodegradation patterns (Cavelan et al., 2022). Furthermore, a better coupling of in-situ and ex-situ monitoring methods is needed to better characterize these multi-component contaminations and their mobilization processes. To this end, we developed two instrumented lysimetric columns, allowing the monitoring of contaminated soils under controlled current and extreme climatic conditions. These instrumentations combine an in-situ physical-chemical and geophysical monitoring of the contaminated soil properties (water content, temperature, electrical conductivity and permittivity, pH, redox, weight), and the molecular characterization of contaminated water and surface gases (GC/MS, µGC). The effect on the fate of diesel-contaminated soils of the groundwater level fluctuations intensity and precipitation regime was tested over 120 days. The coupling of methods showed that: (1) 7% (lower intensity of water level variation) to 10% (high intensity of water level fluctuations) of the initial contamination was remobilized towards the dissolved phase and, in a less extant, to the gas phase. (2) Part of the dissolved contaminations was rapidly biodegraded. (3) An increase in the intensity of the water table level variations in the climate change context will accentuate the spreading and the trapping of the contaminants across the soil porosity, increasing LNAPL remobilization processes such as higher volatilization and toxic gaseous surface emissions and higher dissolution rates in the water table. This work is partly funded by the LUE DEEPSURF (ANR-15-IDEX-04-LUE) and the BRGM, and is included in the GISFI scientific research consortium (http://www.gisfi.univ-lorraine.fr). The authors thank the GISFI for providing field site devices and the technical staff (Cyrielle Bonne and Fabien Domptail).
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Dates et versions

hal-04197673 , version 1 (07-09-2023)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

  • HAL Id : hal-04197673 , version 1

Citer

Amélie Cavelan, Fabrice Golfier, Stéfan Colombano, Anne-Julie Tinet, Constantin Oltean, et al.. New lysimetric experiments to assess the effect of water table-level variations on the fate of petroleum hydrocarbon pollutants (LNAPL) in soils in the climate change context. Goldschmidt 2023, European Association of Geochemistry; Geochemical Society, Jul 2023, Lyon, France. ⟨hal-04197673⟩
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