土壤除Pb添加EDTA增加Pb的流动性.pdf

Science of the Total Environment 349 (2005) 56– 66 /locate/scitotenv Removal of Pb from a calcareous soil during EDTA-enhanced electrokinetic extraction a,b,T a c c S. Amrate , D.E. Akretche , C. Innocent , P. Seta aLaboratory of Hydrometallurgy and Molecular Inorganic Chemistry, Faculty of Chemistry, University of Science and Technology Houari Boumediene (USTHB), B.P. 32 El-Alia, 16111 Bab-Ezzouar, Algiers, Algeria b Centre of Research of Physico-Chemical Analyses (CRAPC), B.P. 248 Algiers, RP 16004 Algiers, Algeria cEuropean Institute of Membranes, IEM/UM II, Place Euge`ne Bataillon, CC 047, F 34095 Montpellier Cedex 5, France Received 1 June 2004; received in revised form 6 November 2004; accepted 12 January 2005 Available online 19 February 2005 Abstract Electrokinetic extraction has been tested to remove lead from an Algerian contaminated soil ([Pb]=4.432 F0.275 mg g1) sited near a battery plant. The effect of EDTA at various concentrations (0.05–0.20 M) on the enhancement of lead transport has been studied by applying a constant voltage corresponding to a nominal electric field strength of 1 V cm1 (duration: 240 h). Results of contaminant distribution across the experimental cell have shown efficient transport of lead toward the anode despite the presence of calcite (25%) and the high acid/base buffer capacity of the soil. To avoid ligand loss, which would be anodically oxidized, the cell was modified by adding extra compartments and inserting cation exchange membranes (Neosepta CMX). Thus, simultaneous recovery of