Flushing of a Pb(II) Contaminated Soil Using HCl, EDTA, and CaCl2
Publication: Journal of Environmental Engineering
Volume 122, Issue 1
Abstract
Flushing of a Pb(II) synthetically contaminated sandy loam using 0.1 N HCl, 0.01 M EDTA, and 1 M CaCl 2 was investigated in the continuous-flow (column) mode. Initial Pb soil concentrations ranged from 500 to 600 mg/kg. Pb-removal efficiencies (and final soil Pb concentrations) for HCl, EDTA, and CaCl 2 were 85% (77 mg/kg Pb), 100% (≈0 mg/kg Pb), and 78% (135 mg/kg Pb), respectively. Given that HCl and CaCl 2 could not reduce the soil Pb to background levels (≈25 mg/kg) for a synthetically contaminated soil brings into doubt their effectiveness in remediating actual contaminated soils where metal retention would be much stronger. While EDTA removed all lead (indigenous and “artificial”), its treatment and reuse and possible adverse health effects makes its use difficult. The final soil pH for HCl was near 1, raising the concern of increased contaminant mobility, decreased soil productivity, and adverse changes in the soil's chemical and physical structure due to mineral dissolution. Final soil pHs for EDTA and CaCl 2 ranged between 4.85 and 5.2.
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References
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Cline, S. R., and Reed, B. E.(1995). “Lead removal from soils via bench-scale soil washing techniques.”J. Envir. Engrg., ASCE, 121(10), 700–705.
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Moore, R. E. (1995). “In-situ soil flushing of a sandy loam contaminated with Pb(II), PbSO 4, PbCO 3, or Pb-Naphthalene,” MS thesis, Dept. of Civ. and Envir. Engrg., West Virginia Univ., Morgantown, W.Va.
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Reed, B. E., and Cline, S. R.(1994). “Retention and release of lead by a very fine sandy loam: I. Isotherm modeling.”Separation and Sci. Technol., 29(12), 1529–1551.
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Copyright © 1996 American Society of Civil Engineers.
History
Published online: Jan 1, 1996
Published in print: Jan 1996
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