Column Experiment for the Removal of Cadmium, Copper, Lead and Zinc from Artificially Contaminated Soil using EDTA, Rhamnolipids, and Soapnut

Elijah Ugwu, Bhaskar Sen Gupta, Adebayo J. Adeloye, Nadia Martínez-Villegas

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Abstract

Environmental contamination caused by high contents of toxic metals in the
soil is a global concern. Soil washing using chelating agents and saponin can
enhance metal removal from contaminated soils through the formation of
soluble metal complexes, mobilization, and extraction with the washing
solutions. Column experiments were conducted in this study to assess the
feasibility of using a chelate (EDTA), a saponin (soapnut) and microbial
(rhamnolipid) cleaning agents to enhance the removal of Cd, Cu, Pb and Zn
from sandy loam contaminated soils. The cumulative removal of Cd after 10
pore volumes were 74.05 for EDTA, 63.08 for rhamnolipids, and 69.07 for
soapnut. The cumulative removals of Cu after washing with 10 pore volumes
were 64.72% for soapnut, 61.58% for rhamnolipids and 61.95% for EDTA.
Also, the cumulative removals of Pb were 62% for soapnut, 59.65% for
rhamnolipids and 59.95% for EDTA after washing with 10 pore volumes.
The cumulative removals of Zn after washing with 10 pore volumes were
68.54% for soapnut, 62.65% for rhamnolipids and 66.08% for EDTA. The
performance of these experiments demonstrates that the application of these
cleaning agents in in-situ soil remediation can be effective alternative to ex-situ remediation.
Original languageEnglish
Number of pages7
JournalEuropean Journal of Environment and Earth Sciences
Volume2
Issue number2
DOIs
Publication statusPublished - 5 Mar 2021

Keywords

  • Heavy metals
  • Saponin
  • CONTAMINATED SOIL
  • Pore volume
  • Biosurfactant
  • Soil washing

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