Modélisation du transport hydrogéochimique de l'infiltration d'eaux usées traitées par traitement tertiaire dans une zone de dune, Belgique

Translated title of the contribution: Hydrogeochemical transport modeling of the infiltration of tertiary treated wastewater in a dune area, Belgium

Alexander Vandenbohede, Ilka Wallis, Emmanuel Van Houtte, Eric Van Ranst

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    Managed artificial recharge (MAR) is a well-established practice for augmentation of depleted groundwater resources or for environmental benefit. At the St-André MAR site in the Belgian dune area, groundwater resources are optimised through re-use of highly treated wastewater by means of infiltration ponds. The very high quality of the infiltration water sets this system apart from other MAR systems. The low total dissolved solid (TDS) content in the infiltration water (less than 50 mg/L) compared to the dune aquifer (500 mg/L) triggers a number of reactions, increasing the TDS through soil-aquifer passage. Multi-component reactive transport modelling was applied to analyse the geochemical processes that occur. Carbonate dissolution is the main process increasing the TDS of the infiltration water. Oxic aquifer conditions prevail between the infiltration ponds and the extraction wells. This is driven by the high flow velocities, leaving no time to consume O2 between the ponds and extraction wells. Cation exchange is important when infiltration water is replaced by native dune water or when significant changes in infiltration-water quality occur. The seasonal variation of O2 and temperature in the infiltration water are the main drivers for seasonal changes in the concentration of all major ions.

    Translated title of the contributionHydrogeochemical transport modeling of the infiltration of tertiary treated wastewater in a dune area, Belgium
    Original languageFrench
    Pages (from-to)1307-1321
    Number of pages15
    JournalHydrogeology Journal
    Volume21
    Issue number6
    DOIs
    Publication statusPublished - 1 Sep 2013

    Keywords

    • Artificial recharge
    • Belgium
    • Geochemistry
    • Solute transport
    • Water re-use

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