Electrokinetic Remediation of Tropical Soils: Effect of the Electric Potential Difference

R.Z. Velten, D.C. Lima, M.P.F. Fontes, C.A.B. Carvalho

Article

Soils and Rocks, São Paulo, 39(3): 249-260, September-December, 2016 | PDF


Abstract

This paper addresses the influence of electric potential difference on the electroosmotic decontamination of two tropical soils from Brazil. The laboratory testing program encompassed: (i) two residual soils of gneiss, a C-horizon saprolite clayey silty sand (soil sample A) and a B-horizon sandy silty clay (soil sample B); (ii) mineralogical and chemical analysis of the soils; (iii) addition of an aqueous solution of cadmium nitrate in the concentration of 100 mg.L-1 to the soil samples; (iv) compaction of the mixtures specimens at the Standard AASHTO; (v) electroosmotic decontamination tests applying 5, 15 and 30 V; (vi) application of a modified sequential extraction analysis adapted to tropical soils. The results support that the PZC of soils influenced the direction of cadmium migration and that the increase in the applied electric potential difference led to the increase in the amount of extractable contaminant.


Submitted on October 20, 2015; Final Acceptance on November 27, 2016; Discussion open until April 28, 2017.