Reactive Transport Modelling of Emerging Contaminants Attenuation by using the Sequential Managed Aquifer Recharge Technology (SMART 2.0)

Alicia Sanz-Prat1, Janek , Greskowiak1, Sema Karakurt2, Uwe Hübner2, Jörg E. Drewes2, Gudrun Massmann1
1 Carl von Ossietzky Universität Oldenburg, Institute of Biology and Environmental Sciences, Working Group Hydrogeology and Landscape Hydrology, D-26111 Oldenburg, Germany
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 [1] 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 [4]. 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 [5]. Numerical outcomes are computed by a deterministic approach of the advective-dispersive-reactive equation (ADR), derived from the PHT3D model.

[1] BURKE, V., DUENNBIER, U. and MASSMANN, G. (2013): The effect of aeration on the removal of wastewater-derived pharmaceutical residues from groundwater – a laboratory study - Water Science & Technology, 67 (3) 658-666.

[2] REGNERY, J., WING, A.D., KAUTZ, J., DREWES, J.E. (2016): Introducing sequential managed aquifer recharge technology (SMART) – From laboratory to full-scale application - Chemosphere, 154, 8 -16.

[3] HELLAUER, K., MERGEL, D., RUHL, A.S., FILTER, J., HÜBNER, U., JEKEL, M., DREWES, J. (2017): Advancing Sequential Managed Aquifer Recharge Technology (SMART) Using Different Intermediate Oxidation Processes. Water, 9, 221.

[4] HÜBNER, U., GALLEGOS, J., KARAKURT, S., ZHITENEVA, V., HELLAUER, K., DREWES, J.E. (2017): Development of a treatment concept based on technically modified hybrid filtration systems for indirect potable reuse - Submitted Abstract World Water Congress & Exhibition 2018, Tokyo.

[5] BURKE, V., GRESKOWIAK, J., ASMUSS, T., BREMERMANN, R., TAUTE, T., MASSMANN, G. (2014): Temperature dependent redox zonation and attenuation of wastewater-derived organic micropollutants in the hyporheic zone - Science of the Total Environment, 482-483, 53-61.

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