电动力学技术修复铅污染的土壤的条件优化研究

Research on Optimum Condition of Remedying Soil Contaminated by Lead Based on the Technology of Electrokinetic

电动力学修复技术修复被铅污染的土壤受到多种因素的影响,如电压、电极面积、电极材料等都有较大的影响,很有必要进行研究。针对存在的问题,系统的研究了电压、电极面积、电极材料对电动力学修复技术的影响。研究表明影响土壤中重金属Pb去除率的因素大小顺序为:电压>电极面积>电极材料。元素铅的最佳去除条件分别为A1B2C3。采用低于氢析出电压进行电动力学修复时,更有利于提高土壤中重金属去除率;增大电极面积,提高了电流强度,有利于土壤中重金属的转化、迁移,从而提高土壤中重金属去除率。

Repairing lead contaminated soil with the electrokinetic remediation technology gets influenced with many factors such as voltage, electrode area, electrode material and so on. All above are necessary to carefully investigate their huge effects on the technology of electrokinetic remediation. In the light of existing problems, the effects of voltage, electrode area and electrode material on electrokinetic remediation were systematically studied. The results of the experiment indicate that voltage has greatest effects on removing rate of lead in the soil; electrode area comes second and electrode material has the least influence. The optimum condition of the removing rate of lead is the presence of A1B2C3. The application of electrokinetic remediation with a voltage that does not exceed the voltage of hydrogen evolution will improve the removing rates of heavy metal in the soil. Increasing the electrode area and improving the intensity of current are conducive to the migration and transformation of heavy metal in the soil, thus improving the removal rates of heavy metal.