Investigation of a combined continuous flow system for the removal of Pb and Cd from heavily contaminated soil

In this study, a combined continuous flow system was designed to remove Pb and Cd from heavily contaminated mine tailing soils. 0.05 M Na2EDTA was used as a chelating agent to remove Pb and Cd from polluted soil, taken from the vicinity of Kayseri ÇİNKUR, Turkey. The initial concentrations of Pb and...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2019-08, Vol.229, p.181-187
Main Authors: Delil, Aydeniz D., Köleli, Nurcan
Format: Article
Language:English
Subjects:
Combined treatment system
EDTA
Electrodeposition
Potential toxic metals
Soil leaching
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Summary:In this study, a combined continuous flow system was designed to remove Pb and Cd from heavily contaminated mine tailing soils. 0.05 M Na2EDTA was used as a chelating agent to remove Pb and Cd from polluted soil, taken from the vicinity of Kayseri ÇİNKUR, Turkey. The initial concentrations of Pb and Cd were 16381 ± 643 and 34347 ± 1310 mg kg-1, respectively. The electrochemical treatment process was applied to the waste washing solution, which emerged after being extracted from soil column and contained Pb and Cd. Metal ions were transformed to the metallic form by applying the electrochemical treatment process to the washing solution, containing Pb2+ and Cd2+. At the end of the leaching experiment, which was done with a 50 g soil sample in the soil column system, Pb and Cd removal efficiencies from soil were 59.72% and 58.01%, respectively. Then, the soil column solution was subjected to electrolysis through a 48 h period at 10 V. The electrochemical removal efficiency of ions, which moved from column to solution, was 84.46% for Pb and 59.21% for Cd. •The remediation performance of the continuous flow combined treatment system was evaluated for heavily contaminated soils.•The Cd concentration transferred from the soil column to the solution is greater than the Pb.•There is a linear relationship between the potential that is applied in electrochemical studies and the removal efficiency.•Cd ion, compared to Pb ion, is less reduced in the electrochemical cell.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2019.04.201