Remediation of Lead Contaminated Soil by EDTA. I. Batch and Column Studies

摘要: Extraction using ethylenediaminetetraacetic acid (EDTA), and other chelates has been demonstrated to be an effective method of removal Pb from many contaminated soils. However, column leaching alkaline soils with EDTA problematic due extremely low soil permeability. The first purpose this study was develop batch extraction procedures methods analysis data provide solubility information which can used model the second determine effect addition KOH CaCl2 K2H2EDTA extract solution on both hydraulic conductivity removal. A Pb-contaminated sample collected abandoned battery recycling facility. Both shaker extractions experiments were completed 5 different solutions. When only added no change in amount removed by observed. As expected, lead observed decrease as pH increased KOH. slightly decreased time required leach 6.0 L through columns varied 2 33 days. and/or resulted relative EDTA-only solution. related residual calcium carbonate content, suggesting that dissolution CaCO3 subsequent production CO2 gas pores partially responsible for reductions diminished because also kinetic limitations associated shorter residence column.