Electrokinetic remediation of nickel from low permeability soil

Saleem, M. and Chakrabarti, M.H. and Irfan, M.F. and Hajimolana, S.A. and Hussain, M.A. and Diya'uddeen, B.H. and Daud, W.M.A.W. (2011) Electrokinetic remediation of nickel from low permeability soil. International Journal of Electrochemical Science, 6 (9). pp. 4264-4275. ISSN 1452-3981

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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.

Item Type: Article
Additional Information: 854NL Times Cited:2 Cited References Count:34
Uncontrolled Keywords: Electrokinetic process, Nickel, Low permeability soil, Removal efficiency, Current density, Contaminated soil, Heavy-metals, Removal, Chromium, Cadmium.
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TP Chemical technology
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 10 Jul 2013 01:26
Last Modified: 08 Nov 2017 08:46
URI: http://eprints.um.edu.my/id/eprint/7012

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