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Washing and Extraction of Metals from Two Industrially Contaminated Soils: A Prognostication for Techno-economic Clean up

Author

Listed:
  • C. N. Uyo

    (Federal University of Technology, Nigeria)

  • L. Mgbeahuruike

    (Federal University of Technology, Nigeria)

  • S. S. Potgieter-Vermaak

    (Manchester Metropolitan University, UK)

  • L. van Dyk

    (University of the Witwatersrand, South Africa)

  • J. H. Potgieter

    (Manchester Metropolitan University, UK)

  • M. U. Dike

    (Federal University of Technology, Nigeria)

  • E. I. Emereibeole

    (Federal University of Technology, Nigeria)

  • R. F. Njoku-Tony

    (Federal University of Technology, Nigeria)

  • C. E. Ihejirika

    (Federal University of Technology, Nigeria)

  • F. A. Edo

    (Federal University of Technology, Nigeria)

  • K. M. Iwuji

    (Federal University of Technology, Nigeria)

Abstract

The extraction and recovery of metals from contaminated soil has become inevitable considering the increasing premium placed on environmental and human health protection as well as predicted shortfalls in primary metal production. In this study, metal extraction from two industrially contaminated soils (Copsa-mica [Rb-So] and Campina [Ro-PH]) were considered for process (column and heap) leaching configuration using different selected chelating substances; ethylene diamine tetraacetic acid [EDTA], ethylene diamine disuccinic acid [EDDS], acetylacetone [Hacac] and citric acid [CA]. The result confirms optimal recovery of EDTA column-induced-Rb-So over chelant-heap induced configuration and was adopted for economic prediction using two possible (60% and 100%) recycled scenarios. The 100% recycled scenario resulted in a viable economic process sufficient enough to offset clean-up cost. Metal separation and recovery from M-EDTA complex could be facilitated with the use of H2S gas precipitated in hydrogen flame combustion. The process economics predicted offered a probable prospect for metal separation from washing liquor.

Suggested Citation

Handle: RePEc:epw:ejchem:v:2:y:2021:i:4:id:5074
DOI: 10.24018/ejchem.2021.2.4.74
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