Electrokinetic treatment of an agricultural soil contaminated with heavy metals

Electrokinetic treatment of an agricultural soil contaminated with heavy metals

The high organic matter content in agricultural soils tends to complex and retain contaminants such as heavy metals. Electrokinetic remediation was tested in an agricultural soil contaminated with Co +2 , Zn +2 , Cd +2 , Cu +2 , Cr(VI), Pb +2 and Hg +2 . The unenhanced electrokinetic treatment was n...

Full description

Saved in:
Bibliographic Details
Published in:Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Vol. 51; no. 9; pp. 691 - 700
Main Authors: Figueroa, Arylein, Cameselle, Claudio, Gouveia, Susana, Hansen, Henrik K.
Format: Journal Article
Language:English
Published: England Taylor & Francis 28-07-2016
Taylor & Francis Ltd
Subjects:
Agriculture
Agronomy
Anodes
Bioremediation
Cadmium - analysis
Cathodes
Citric Acid - analysis
Cobalt - analysis
Contamination
Copper - analysis
Edetic Acid - analysis
Electric fields
Electrochemical Techniques - methods
Electrodes
Electrokinetic remediation
Electrokinetics
Environmental Restoration and Remediation - methods
Heavy metals
Hydrogen-Ion Concentration
Kinetics
Metals, Heavy - analysis
organic matter
soil
Soil (material)
Soil - chemistry
Soil contamination
Soil Pollutants - analysis
Zinc - analysis
organic matter
Electrokinetic remediation
soil
heavy metals
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The high organic matter content in agricultural soils tends to complex and retain contaminants such as heavy metals. Electrokinetic remediation was tested in an agricultural soil contaminated with Co +2 , Zn +2 , Cd +2 , Cu +2 , Cr(VI), Pb +2 and Hg +2 . The unenhanced electrokinetic treatment was not able to remove heavy metals from the soil due to the formation of precipitates in the alkaline environment in the soil section close to the cathode. Moreover, the interaction between metals and organic matter probably limited metal transportation under the effect of the electric field. Citric acid and ethylenediaminetetraacetic acid (EDTA) were used in the catholyte as complexing agents in order to enhance the extractability and removal of heavy metals from soil. These complexing agents formed negatively charged complexes that migrated towards the anode. The acid front electrogenerated at the anode favored the dissolution of heavy metals that were transported towards the cathode. The combined effect of the soil pH and the complexing agents resulted in the accumulation of heavy metals in the center of the soil specimen.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1093-4529
1532-4117
DOI:10.1080/10934529.2016.1170425