Research Article

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

C. N. Uyo
Federal University of Technology, Nigeria
* Corresponding author
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
DOI icon 10.24018/ejchem.2021.2.4.74

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Submitted 2021-09-01
Published 2021-10-18

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Article Main Content

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.

Keywords: EDTA EDSS Extraction H₂S gas Metals Washing

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