Department of Environmental Engineering, Mersin University, Mersin, Turkey.
Environ Technol. 2013 Mar-Apr;34(5-8):799-805. doi: 10.1080/09593330.2012.717107.
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)).
评价了一种两步法修复三种不同类型铅（Pb）污染土壤的方法。第一步包括用乙二胺四乙酸（EDTA）从土壤中洗脱 Pb。洗涤实验在 0.05 M Na2EDTA 与土壤液比为 1:10 的条件下进行。洗涤后，土壤中 Pb 的去除效率在 50-70%之间。在土壤洗涤过程之后，在固定床反应器中电化学还原洗出液中的 Pb2+离子。在-2.0 V 电位下电化学还原的 Pb 去除效率在 57-76%之间。总体结果表明，由于将有毒的 Pb2+离子转化为无害的金属形式（Pb(0)），该两步法是一种环保且有效的修复 Pb 污染土壤和处理 Pb 污染废水的技术。
