Electrokinetic remediation of nickel from low permeability soil
Document Type
Article
Publication Date
1-1-2011
Abstract
Electrokinetic remediation of nickel from low permeability soil using titanium electrodes having inter-electrode spacing of 10 cm was carried out in a cylindrical reactor. The influences of current density, voltage gradient and electrolyte pH were investigated upon removal efficiency for 60 h experimental runs. Efficiency improved from 49.3 to 57.2 when the current density was increased from 4.36 mA/cm 2 to 13.1 mA/cm 2. Furthermore, an enhancement in efficiency from 38.5 to 54.3 was observed when voltage gradient increased from 1 V/cm to 2 V/cm (at 13.1 mA/cm 2). Further increase in voltage gradient to 2.5 V/cm improved efficiency during initial runs. However, an overall reduction of 3.2 was observed after 60 h of operation in comparison to that obtained at 2 V/cm. This may be attributed to precipitation and localized accumulation of metallic ions. An inverse relationship between efficiency and electrolyte pH was also observed (at 13.1 mA/cm 2 and 2 V/cm). Although a removal of 74.1 was achieved at pH = 4.5, the system required optimization as the nickel content in treated soil was above the maximum values given in international standards.
Keywords
Electrokinetic process, Nickel, Low permeability soil, Removal efficiency, Current density, Contaminated soil, Heavy-metals, Removal, Chromium, Cadmium
Divisions
fac_eng
Publication Title
International Journal of Electrochemical Science
Volume
6
Issue
9
Publisher
Electrochemical Science Group
Additional Information
854NL Times Cited:2 Cited References Count:34