Transfer of trace organic compounds in an operational soil-aquifer treatment system assessed through an intrinsic tracer test and transport modelling

Guillemoto, Quentin; Picot-Colbeaux, Géraldine; Valdes, D.; Devau, Nicolas; Mathurin, Frédéric; Pettenati, Marie; Kloppmann, Wolfram; Mouchel, J.-M.

doi:10.1016/j.scitotenv.2022.155643

Cited by 8 publications

(6 citation statements)

References 54 publications

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“…TrOC reactivity in the Agon-Coutainville SAT has already been quantified [20], at the scale of an infiltration pond and at laboratory scale [44]. Our modelling results show that the reactivity observed at these scales can be modified over time and space due to modifications of groundwater flow velocity and dilution.…”

Section: Effects Of Sat Variations On the Fate Of Trocs At The Hydros...mentioning

confidence: 65%

“…It assesses water flow velocities and the optimal proportions of secondary treated wastewater (STWW), from the infiltration ponds to the aquifer outlet, and at aquifer scale. Before, such information was only available on an ad hoc and local infiltration-pondscale [20]. Flow velocities and STWW proportions in the aquifer can now be quantified over time at any point in the aquifer.…”

Section: Discussionmentioning

confidence: 99%

“…The Agon-Coutainville commune is located in Normandy (France), on the western coastline of the English Channel, between cape La Hague and the bay of Mont Saint Michel (Figure 1). The SAT system has been operational for over 20 years as a complement to the wastewater treatment plant (WWTP), to prevent direct discharge of secondary-treated wastewater (STWW) into the sea [18,20]. The WWTP is designed for a 35,300 population equivalent and uses activated sludge biological treatment.…”

Section: Study Area: Agon-coutainville Normandy Francementioning

confidence: 99%

“…In this paper, we focus on the specific case of an experimental coastal SAT system at Agon-Coutainville, France [18], where secondary treated wastewater (STWW) is alternately discharged into a dune aquifer via different infiltration ponds. Measurements of groundwater TrOC concentrations have been carried out since 2016 at the site [18][19][20]. Previous investigations on this experimental site have quantified the reactivity of molecules under specific experimental conditions [20].…”

Section: Introductionmentioning

confidence: 99%

“…Measurements of groundwater TrOC concentrations have been carried out since 2016 at the site [18][19][20]. Previous investigations on this experimental site have quantified the reactivity of molecules under specific experimental conditions [20].…”

Section: Introductionmentioning

confidence: 99%

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Multi-Annual Dynamics of a Coastal Groundwater System with Soil-Aquifer Treatment and Its Impact on the Fate of Trace Organic Compounds

Guillemoto

Picot-Colbeaux

Valdes

et al. 2023

Water

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The combination of managed aquifer recharge (MAR) with soil-aquifer treatment (SAT) has clear advantages for the future sustainable quality and quantity management of groundwater, especially when using treated wastewater. We built a Marthe flow and transport model of an MAR–SAT system located in a near-shore sand aquifer, for quantifying the influence of environmental factors (climate, tides, and operational conditions) on the coastal hydrosystem with regard to the fate of trace organic compounds (TrOCs). The simulations show the impact of these factors on flow rates and dilution, and thus, on the potential reactivity of TrOCs. The dilution of secondary treated wastewater (STWW) is variable, depending on the operations (feeding from infiltration ponds) and on shore proximity (dilution by saltwater). We show that, close to the ponds and during infiltration, the attenuation of TrOC concentrations can be explained by reactivity. At the natural outlet of the aquifer, the simulated average residence times ranged from about 70 to 500 days, depending upon seasonal dynamics. It is important to study TrOCs at site scale in order to anticipate the effect of natural variations on the SAT and on the fate of TrOCs.

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Section: Effects Of Sat Variations On the Fate Of Trocs At The Hydros...mentioning

confidence: 65%

Section: Discussionmentioning

confidence: 99%

Section: Study Area: Agon-coutainville Normandy Francementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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