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The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment

Author

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  • Rui Hu

    (School of Earth Science and Engineering, Hohai University, Fo Cheng Xi Road 8, Nanjing 211100, China)

  • Arnaud Igor Ndé-Tchoupé

    (Department of Chemistry, Faculty of Sciences, University of Douala, B.P. 24157 Douala, Cameroon)

  • Mesia Lufingo

    (Department of Water and Environmental Science and Engineering, Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania)

  • Minhui Xiao

    (School of Earth Science and Engineering, Hohai University, Fo Cheng Xi Road 8, Nanjing 211100, China)

  • Achille Nassi

    (Department of Chemistry, Faculty of Sciences, University of Douala, B.P. 24157 Douala, Cameroon)

  • Chicgoua Noubactep

    (Department of Applied Geology, Universität Göttingen, Goldschmidtstraße 3, D-37077 Göttingen, Germany)

  • Karoli N. Njau

    (Department of Water and Environmental Science and Engineering, Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania)

Abstract

Studies were undertaken to determine the reasons why published information regarding the efficiency of metallic iron (Fe 0 ) for water treatment is conflicting and even confusing. The reactivity of eight Fe 0 materials was characterized by Fe dissolution in a dilute solution of ethylenediaminetetraacetate (Na 2 –EDTA; 2 mM). Both batch (4 days) and column (100 days) experiments were used. A total of 30 different systems were characterized for the extent of Fe release in EDTA. The effects of Fe 0 type (granular iron, iron nails and steel wool) and pretreatment procedure (socking in acetone, EDTA, H 2 O, HCl and NaCl for 17 h) were assessed. The results roughly show an increased iron dissolution with increasing reactive sites (decreasing particle size: wool > filings > nails), but there were large differences between materials from the same group. The main output of this work is that available results are hardly comparable as they were achieved under very different experimental conditions. A conceptual framework is presented for future research directed towards a more processed understanding.

Suggested Citation

  • Rui Hu & Arnaud Igor Ndé-Tchoupé & Mesia Lufingo & Minhui Xiao & Achille Nassi & Chicgoua Noubactep & Karoli N. Njau, 2019. "The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment," Sustainability, MDPI, vol. 11(3), pages 1-20, January.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:3:p:671-:d:201273
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    References listed on IDEAS

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