Enhancement Of Electro-Osmotic Flow During The Electrokinetic Treatment Of A Contaminated Soil. (1st November 2015)

• Record Type: Journal Article
• Authors: Cameselle, Claudio
• Is Part Of: Electrochimica acta. Volume 181(2015)
• Page Start: 31
• Page End: 38
• Publication Date: 2015-11-01
• Subjects: electro-osmotic flow -- electrokinetic remediation -- voltage gradient -- citric acid; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.02.191
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: The electrokinetic remediation of contaminated soils relies in two main transport mechanisms: electromigration and electro-osmosis. The electro-osmotic flow depends on fluid characteristics (dielectric constant and viscosity) and soil surface characteristics represented by Z-potential, as well as voltage gradient. In this work, the influence of voltage gradient in the development and maintenance of electro-osmotic flow is studied. The voltage gradient directly affected the electro-osmotic flow but it also affected the geochemistry of soil that had a critical effect on electro-osmosis. It was demonstrated that 1 V/cm resulted in the development and maintenance of a large electro-osmotic flow. The use of organic acids, such as citric acid, induced large electro-osmotic flow due to the interaction of the organic acids with the soil particles. The use of citric acid was considered to be very promising for large-scale operation.