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Effect of Acetic Acid on Field Remediation Efficiency of Lead (Pb) contaminated soil with Electrokinetic Technology

Document Type : Original Article

Authors

Assistant prof., National Salinity Research Center, Agricultural Research, Education and Extension Organization, Yazd

Abstract

Electrokinetic soil remediation is one of the innovative methods for decontamination of heavy metals from polluted soils. However, employing that method at field condition in soils with great adsorption capacity for heavy metals, needs to be studied thoroughly. In this research a Loam soil spiked with Lead (Pb) used to investigate electrokinetic remediation at field-scale in three depths (0, 15 and 30 cm) at experimental plots. After contamination with lead nitrate solution (1 g l-1), the soil had large amount of Pb (109.5, 102.1 and 87.3 mg kg−1 in three depths 0, 15 and 30 cm, respectively). All experiments were imposed with a constant voltage gradient of 1 V/cm in 10 days period in saturation condition at a field in Tabriz area, North West of Iran. In this study effect of different electrolytes (distilled water, Acetic acid 0.005 M) on the Pb removal efficiency by electrokinetic remediation were studied. The results suggested that removal efficiencies for Pb were influenced by type of electrolyte solution. After applying electrical current for 10 days, mean metal removal efficiency of Pb in distilled water treatment for three depths (0, 15 and 30) were 18.15%, 18.05% and 20.85% respectively. The mean Pb removal from the soil in acetic acid treatment in three mentioned depths were 22.0, 21.55 and 24.05 %, respectively, which represented 3.85, 3.5 and 3.2 % increasing in removal efficiency compared to the distilled water. High lime content (20.1%) of the examined soil appears hindered the increasing in removal efficiency with acetic acid solution. In addition, the pH changes along the soil plots showed an increasing trend from the anode to the cathode. In acetic acid treatment a greater reduction of pH was observed in the anode side.

Keywords

References
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Applied Soil Research
Volume 7, Issue 1 - Serial Number 1
June 2019
Pages 95-107
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History
  • Receive Date: 10 May 2017
  • Revise Date: 06 May 2019
  • Accept Date: 31 October 2017
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