REMOVAL OF PB(II), CD(II) AND CR(III) FROM SAND BY ELECTROMIGRATION

This study presents the results of a new electrokinetic soil remediati on technique in which a conductive solution is inserted between the ca thode and the soil being treated. In this arrangement, the heavy metal s will no longer precipitate in the treated soil. They are transported out of the soil and precipitated in the conductive solution. Furtherm ore, the decrease in conductivity, due to metals precipitated in the s oil, has been avoided. Six laboratory tests have been carried out to r emove lead (II), cadmium (II) and chromium (III) from sand. The experi mental results show that metal removal efficiencies higher than 90% ca n be reached. (C) 1997 Elsevier Science B.V.