, Volume 40, Issue 6, pp 1131-1138
Date: 20 Apr 2010

The efficacy of using electrokinetic transport in highly-contaminated offshore sediments

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Abstract

Contaminated offshore mud samples from two regions of Abu Dhabi were tested for selected element removal using electrokinetics. The efficacy of the test results were compared for low and high salinity pore fluids applied to the mud samples. All samples showed some degree of removal efficiency at the anode end of each specimen by 24-h duration tests. The significance of the work was that similar removal efficiencies of about 20 ± 10% were achieved in both the low and high salinity specimens of these heavily contaminated offshore muds, revealing the potential of electrokinetic treatment in marine environments. The electroosmotic efficiency, as measured by the cumulative volume of flow per Coulombs of charge, was 0.002 cm3/C for the low salinity and 0.006 cm3/C for the high salinity samples. These values compared well with the electroosmotic efficiency of 0.008 cm3/C reported for a synthetic soil reference matrix of high electrolyte content. The low electroosmotic efficiency showed that although flow was achieved in all specimens, the mass transport was mainly dominated by electromigration as expected, and not by electrosmosis.