Coupled hydro-geochemical modelling of a permeable reactive barrier for treating acidic groundwater |
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| Institution: | 1. Department of Geology and Environmental Protection, Hydrogeotechnika Sp z o.o., ul.Sciegiennego 262A, 25-112 Kielce, Poland;2. Department of Spatial Planning and Environmental Sciences, Faculty of Geodesy and Cartography, Warsaw University of Technology, Pl Politechniki 1, 00-661 Warsaw, Poland;3. AGH University of Science and Technology, Department of Hydrogeology and Engineering Geology, Al. Mickiewicza 30, 30-059 Krakow, Poland;1. Utrecht University, Department of Earth Sciences, The Netherlands;2. KWR Watercycle Research Institute, Nieuwegein, The Netherlands |
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| Abstract: | This study focuses on coupling geochemistry with geo-hydraulics to enable time-dependent modelling of the remediation of acidic groundwater using an alkaline permeable reactive barrier (PRB). Chemical clogging due to secondary mineral precipitates reduces the porosity and hydraulic conductivity of the reactive medium. The governing equations are incorporated into commercial numerical codes, MODFLOW and RT3D. An original algorithm was developed for RT3D to simulate geochemical reactions occurring in the PRB. The results and the model predictions are in agreement, confirming that the hydraulic conductivity reduction due to mineral precipitation occurs at the start of permeation and continues until halfway through the testing phase. |
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| Keywords: | Acidic groundwater Chemical clogging Permeable reactive barrier Mineral precipitation Transport modelling |
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