Extraction of heavy metals from contaminated soils using EDTA and HCl

Engineering Journal. 2015;21(1):45-61

 

Journal Homepage

Journal Title: Engineering Journal

ISSN: 1726-4073 (Print); 2520-3339 (Online)

Publisher: University of Baghdad

Society/Institution: University of Baghdad, College of Engineering

LCC Subject Category: Technology: Engineering (General). Civil engineering (General)

Country of publisher: Iraq

Language of fulltext: Arabic, English

Full-text formats available: PDF, DOC

 

AUTHORS

Hatem Asel Gzar
Israa Mohammed Gatea

EDITORIAL INFORMATION

Double blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 12 weeks

 

Abstract | Full Text

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.