Retardation of organic contaminants in a fractured chalk formation: Modelling tracer experiments in a single natural fracture

A. Yakirevich, E. Adar, A. Wefer-Roehl

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    6 Scopus citations

    Abstract

    Breakthrough curves for two sorbing (halogenated aromatic compound 2,4,6-tribromophenol and the pesticide ametryn) and one non-sorbing (2,6-difluorobenzoic acid) contaminants obtained in column experiments with two types of fractured chalk (white and gray) were interpreted by mathematical simulations. The model of parallel plates describes transport of solute in a single fracture accounting for the processes of dispersion, diffusion into porous matrix, sorption, and rate-limited mass-transfer through stagnant film near the fracture wall. The unknown parameters: Fracture aperture, mass transfer coefficient, and dispersivity were found by fitting the experimental and the theoretical breakthrough curves of the non-sorbing contaminant. These parameters were then used to simulate transport of the sorbing organic contaminants. A fairly good agreement between the simulated and observed concentrations proves the validity of the model. The analysis of breakthrough curves reveals a stronger retardation of organic contaminants in the gray chalk than in the white chalk.

    Original languageEnglish
    Title of host publicationComputational methods in water resources - Volume 1 - Computational methods for subsurface flow and transport
    EditorsL.R. Bentley, J.F. Sykes, C.A. Brebbia, W.G. Gray, G.F. Pinder, L.R. Bentley, J.F. Sykes, C.A. Brebbia, W.G. Gray, G.F. Pinder
    PublisherA.A. Balkema
    Pages299-306
    Number of pages8
    ISBN (Print)9058091244
    StatePublished - 1 Jan 2000
    EventComputational Methods in Water Resources XIII - Calgary, Canada
    Duration: 25 Jun 200029 Jun 2000

    Conference

    ConferenceComputational Methods in Water Resources XIII
    Country/TerritoryCanada
    CityCalgary
    Period25/06/0029/06/00

    ASJC Scopus subject areas

    • Earth and Planetary Sciences (all)
    • Engineering (all)
    • Environmental Science (all)

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