Reactive Transport of Iomeprol during Stream-Groundwater Interactions

Irina Engelhardt, Henning Prommer, Manoj Schulz, Jan Vanderborght, Christoph Schüth, Thomas Ternes

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    The transport and biochemical transformations of the iodinated X-ray contrast medium (ICM) iomeprol were studied at the stream/groundwater interface. During a one-month field experiment piezometric pressure heads, temperatures, and concentrations of redox-sensitive species, iomeprol and 15 of its transformation products (TPs) were collected in stream- and groundwater. The data set was analyzed and transformation processes and rates identified by comparing conservative and reactive transport simulations. ICM and TP transformations were simulated as a cometabolic process during organic carbon degradation. Using iomeprol/TPs ratios as calibration constrain mitigated the uncertainties associated with the high variability of the ICM wastewater discharge into the investigated stream. The study provides evidence that biodegradation of ICM occurs at the field-scale also for predominantly denitrifying conditions. Under these anaerobically dominated field conditions shortest simulated half-life (21 days) was in the same range as previously reported laboratory-determined half-lives for aerobic conditions.

    Original languageEnglish
    Pages (from-to)199-207
    Number of pages9
    JournalEnvironmental Science and Technology
    Volume48
    Issue number1
    DOIs
    Publication statusPublished - 2014

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