title: The sequential use of washing and an electrochemical reduction process for the remediation of lead-contaminated soils.
abstract: A two-step method for the remediation of three different types of lead (Pb)-contaminated soil was evaluated. The first step included soil washing with ethylenediaminetetraacetic acid (EDTA) to remove Pb from soils. The washing experiments were performed with 0.05 M Na2EDTA at 1:10 soil to liquid ratio. Following the washing, Pb removal efficiency from soils ranged within 50-70%. After the soil washing process, Pb2+ ions in the washing solution were reduced electrochemically in a fixed-bed reactor. Lead removal efficiency with the electrochemical reduction at -2.0 V potential ranged within 57-76%. The overall results indicate that this two-step method is an environmentally-friendly and effective technology to remediate Pb-contaminated soils, as well as Pb-contaminated wastewater treatment due to the transformation of toxic Pb2+ ions into a non-hazardous metallic form (Pb(0)).
authors.affiliation: Department of Environmental Engineering, Mersin University, Mersin, Turkey.
authors.forename: Aydeniz
authors.initials: A
authors.lastname: Demir
authors.forename: Nurcan
authors.initials: N
authors.lastname: Köleli
mesh_terms: D004492:Edetic Acid / Q000737:chemistry*; D052918:Environmental Restoration and Remediation; D007854:Lead / Q000737:chemistry* / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry* / Q000302:isolation & purification*
chemical_list: D012987:Soil; D012989:Soil Pollutants; D007854:Lead; D004492:Edetic Acid