Reactive Transport Modelling of Emerging Contaminants Attenuation by using the Sequential Managed Aquifer Recharge Technology (SMART 2.0)
2 Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany
O 17.1 in Water reuse for groundwater recharge
24.03.2018, 11:00-11:15, 1
Many emerging organic contaminants present in surface water and pre-treated wastewater aimed for managed aquifer recharge (MAR) are mobile and may persist in groundwater for long times. A better understanding of the degradation behaviour (e.g, redox-sensitivity) of certain emerging contaminants  could improve the simulations of their fate and transport under specific conditions during the MAR operation. In this sense, the sequential managed aquifer recharge technology (SMART 2.0) introduces a novel and low-energetic approach to foster the removal of organic emerging contaminant compounds by setting a sequence of redox-zones coupled with the presence of biodegradable dissolved organic matter (BDOC) in the injected water [2,3]. In order to validate the SMART 2.0 at demo-scale, a tracer-test is performed by injecting 20 trace organic compounds (TOrC´s) dissolved in pre-treated wastewater into a sandy tank, with a total volume of 7.26 m3. The sequential treatment steps within the tank mimic the river-bank filtration passage, re-aeration, and subsequent artificial recharge . In this study, we present the assessment of a 3-dimensional numerical model simulating the observed fate and behaviour of the TOrC´s (e.g. pharmaceuticals, personal care, and disinfection by-products, among others) during the tank passage. This study aims at identifying (i) the physical and biogeochemical processes controlling the operation of the SMART 2.0 Tank; (ii) the spatial and temporal variability of reaction rates under certain redox conditions and BDOC availability; (iii) as well as, the key groundwater reactive transport parameters. For that purpose, the reactive system accounts for sorption and nonlinear kinetic biodegradation competing for the depletion of TOrC´s concentration in groundwater . Numerical outcomes are computed by a deterministic approach of the advective-dispersive-reactive equation (ADR), derived from the PHT3D model.
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