Einsatz reaktiver Tracer zur Bewertung der Langzeitstabilit�t und Reaktivit�t von Fe(0)-Reaktionsw�nden

Parbs, Anika; Ebert, M.; Köber, Ralf; Plagentz, Volkmar; Schad, Hermann; Dahmke, Andreas

doi:10.1007/s00767-003-0176-3

Cited by 6 publications

(2 citation statements)

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“…A prediction of degradation efficiency and its longevity presents a challenge because such a complete model has yet to be developed, probably because the important processes are not yet identified. Furthermore, at field PRBs complex flow patterns may result in a nonuniform flow through the reactive media and variable residence times ( , ). Despite these uncertainties, column experiment results have shown to be in good agreement with field results for the Rheine PRB () or the Borden PRB ().…”

Section: Discussionmentioning

confidence: 99%

“…ZVI was used as delivered without any pretreatment. Material from coring in the Rheine PRB (3) and Tu ¨bingen PRB (27) was additionally investigated. Vertical drillings in the up-and downgradient interface regions of the PRBs captured material for the experiments and were performed 3.5 and 4.5 y after installation at the Rheine and Tu ¨bingen sites, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Assessing Degradation Rates of Chlorinated Ethylenes in Column Experiments with Commercial Iron Materials Used in Permeable Reactive Barriers

Ebert

Köber

Parbs

et al. 2006

Environ. Sci. Technol.

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Multiple column experiments were performed using two commercial iron materials to evaluate the necessity and usefulness of preliminary investigations in permeable reactive barrier (PRB) design for chlorinated organics. Experiments were performed with contaminated groundwater and involved fresh iron granules or altered iron material excavated from PRBs. The determination of first-order rate coefficients by global nonlinear least-squares fittings indicated a variability in rate coefficients on 1 or 2 orders of magnitude. Geometric mean values of surface area normalized rate coefficients (in 10(-5) L m(-2) h(-1)) for fresh gray cast iron and iron sponge, respectively, are: tetrachloroethene (4.5, 2.6), trichloroethene (8.1, 3.3), cis-1,2-dichloroethene (3.1, 2.9), trans-1,2-dichloroethene (9.5, 5.3), 1,1-dichloroethene (4.0, 4.4), and vinyl chloride (1.6, 6.1). The increasing rate coefficients with decreasing grade of chlorination, which characterize degradation at iron sponge are linearly related to diffusion coefficients in water, suggesting diffusion limitation in the degradation process for this particular material, possibly due to a high inner surface. The variability in rate coefficients seems to be too high to use mean rate coefficients from published studies in the design procedure of PRBs, and variabilities cannot be related to groundwater characteristics, waterflow through the reactive cells, or secondary corrosion reactions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%