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  • 1
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    Testing the Suitability of Zerovalent Iron Materials for Reactive Walls (2018)
    Details
    Publication Date: 2021-03-29
    Description: Zerovalent iron (ZVI) has been proposed as reactive material in permeable in-situ walls for contaminated groundwater. An economically feasible ZVI reactive wall requires cheap but efficient iron materials. From an uranium treatability study and results of iron dissolution in 0.002 M EDTA by five selected ZVI materials, it is shown that current research and field implementation is not based on a rational selection of application-specific iron metal sources. An experimental procedure is proposed which could enable a better material characterization. This procedure consists in mixing ZVI materials and reactive additives including contaminant releasing materials (CRM) in long term batch experiments and characterise the contaminant concentration over the time.
    Keywords: contaminant; groundwater; in-situ remediation; zerovalent iron; uranium ; 551
    Language: English
    Type: article , submittedVersion
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    CITATION GEO-LEO
  • 2
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    Mechanism of uranium fixation by zero valent iron: the importance of co-precipitation (2018)
    Springer | Berlin
    Details
    Publication Date: 2021-03-29
    Description: The coprecipitation of U (VI) with iron corrosion products from aqueous solutions by zero valent iron was investigated. The evidence of coprecipitation was demonstrated by conducting experiments with well characterized scrap iron,pyrite and a mixture of both materials with experimental durations of up to four months. Results indicate that under anoxic conditions only less than one tenth of the immobilized U(VI) was associated with the surface of scrap iron, whereas theremaining amount is entrapped in aging corrosion products.
    Keywords: 551
    Language: English
    Type: anthologyArticle , acceptedVersion
    Format: 577-586
    Format: application/pdf
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    CITATION GEO-LEO
  • 3
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    Mitigating Uranium in Ground Water: Prospects and Limitations (2018)
    Details
    Publication Date: 2021-03-29
    Description: Removal of uranium(VI) by zero-valent iron (ZVI) has been suggested as a feasible pathway to control uranium contaminations in seepage waters. Available information in literature however presents discrepant evidence on the process responsible for the mitigation effect. On basis of an EH-pH diagram of uranium and iron it is outlined that these discrepancies may be explained by the aqueous chemistry of uranium and iron. Additional effects contributing to the complexity of the system are given. Solubilization experiments using scrap iron together with water works sludge, MnO2 and pyrite indicate that U(VI) is immobilized by iron corrosion products after about 50 days.
    Keywords: uranium; remediation; zero-valent iron; environment; ZERO-VALENT IRON; THERMODYNAMIC DATA; NATURAL-WATERS; METAL-IONS; URANYL-ION; ADSORPTION; REDUCTION; COMPLEXATION; SURFACE; REMEDIATION immobilization; corrosion ; 551
    Language: English
    Type: article , submittedVersion
    Format: 20
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    CITATION GEO-LEO
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