A model-based analysis of the reactive transport behaviour of 37 trace organic compounds during bank filtration (Berlin, Germany)

Alicia Sanz-Prat1, Janek Greskowiak1, Victoria Burke1, Carlos A. Rivera Villarreyes2, Julia Krause2, Bertram Monninkhoff2, Alexander Sperlich3, Sebastian Schimmelpfenning3, Uwe Duennbier3, Gudrun Massmann1
1 Carl von Ossietzky University of Oldenburg, Institute for Biology and Environmental Sciences, Working Group Hydrogeology and Landscape Hydrology, D-26111, Oldenburg, Germany.
2 DHI WASY GmbH, Volmerstraße 8, 12489, Berlin, Germany.
3 Berliner Wasserbetriebe, Neue Jüdenstraße 1, 10179, Berlin, Germany.

9.3 in Artificial and natural groundwater recharge (co-organized by IAH-D)

26.03.2020, 14:15-14:30, Händel-Saal

Though bank filtration diminishes the loads of many trace organic compounds (TOrCs) present in the source water, there is still a wide uncertainty on the influence of local environmental conditions on sediment-water interaction and biodegradation processes. This research addresses the fate and transport behaviour of 37 trace organic compounds at a bank filtration site in Germany over a relatively long-time span of six years. Using a two-dimensional FEFLOW heat and reactive transport model, TOrCs are classified according to their environmental behavior and occurrence in bank filtration wells. The subsurface residence time is up to 4 months. We identified 12 persistent compounds, 20 reactive compounds and five transformation products formed during aquifer passage. Estimates of first-order biodegradation rate constants are given for six reactive compounds. Minimum biodegradation rate constants (i.e. maximum half-lives) are approximated for eight compounds only present in surface water. For some compounds, a simple first-order degradation model did not yield satisfactory results and the behaviour appears to be more complex. Processes like sorption, redox and/or temperature dependent biodegradation and temperature-dependent desorption are suspected. The results highlight the ability of the subsurface to improve the water quality during bank filtration, also at the same time these show the persistence of several compounds in the aquifer.

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