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Extraction of heavy metals from contaminated soils using EDTA and HCl | ||
| Journal of Engineering | ||
| Article 1, Volume 21, Issue 1, 2015, Pages 45-61 | ||
| Authors | ||
| Hatem Asel Gzar; Israa Mohammed Gatea | ||
| Abstract | ||
| The present study examines the extraction of lead (Pb), cadmium (Cd) and nickel (Ni) from a contaminated soil by washing process. Ethylenediaminetetraacetic acid disodium salt (Na2EDTA) and hydrochloric acid (HCl) solution were used as extractants. Soil washing is one of the most suitable in-situ/ ex-situ remediation method in removing heavy metals. Soil was artificially contaminated with 500 mg/kg (Pb , Cd and Ni ). A set of batch experiments were carried out at different conditions of extractant concentration , contact time, pH and agitation speed. The results showed that the maximum removal efficiencies of (Cd, Pb and Ni ) were (97, 88 and 24 ) % respectively using ( 0.1 M) Na2EDTA. While the maximum removal efficiencies using (1M) HCl were (98, 94 and 55)% respectively. The experimental data of batch extraction were applied in four kinetic models; first order, parabolic diffusion, two constant and Elovich model. The parabolic diffusion was the most fitted to the experimental data. | ||
| Keywords | ||
| Contaminated Soil; Heavy metals; soil washing; chemical extraction; Kinetics | ||
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