重金属-POPs复合污染土壤的电动修复机理研究

项目名称： 重金属-POPs复合污染土壤的电动修复机理研究

项目编号： No.20807044

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 轻工业、手工业

项目作者： 仓龙

作者单位： 中国科学院南京土壤研究所

项目金额： 18万元

中文摘要： 本项目选择典型的重金属污染物铜和POPs污染物芘为目标污染物，主要研究了控制阴、阳极溶液池pH和添加表面活性剂条件下红壤中铜和芘的迁移和去除的规律；探讨了不同类型氧化剂对土壤中芘的直接降解作用，结合阴、阳极溶液池pH的调控实现了土壤中铜和芘的同时去除，研究表明Na2S2O8是较好的对铜和芘均有较高去除效率的氧化剂；以红壤、黄棕壤和黑土三种典型土壤为供试土壤，研究了不同土壤性质对铜-芘复合污染土壤电动修复的影响，结果表明土壤pH、黏粒含量和重金属形态分布等是影响不同类型土壤上铜和芘去除效率的主导因素。另外针对不同控制条件对土壤pH等理化性质的影响，研究了电动修复处理对土壤性质特别是土壤酶活性的影响机制。根据上述研究结果，获得了同时去除土壤中重金属和有机污染物的最优实验条件，并申请了一项发明专利，为重金属-POPs复合污染土壤的电动修复提供了理论基础和技术依据。

中文关键词： 重金属；POPs；复合污染；电动修复

英文摘要： Copper and pyrene, typical heavy metal and POPs pollutants, were selected as target pollutants and the migration and removal mechanism of copper and pyrene were studied by the control of electrolyte pH and addition of surfactants. The oxidation of pyrene by different kinds of oxidants were investigated. The simultaneous removal of copper and pyrene was achieved by combining pH control and the addition of oxidants, which indicated that Na2S2O8 was the best oxidants for the removal of copper and pyrene among all selective oxidants. The effect of different soil types (red soil, yellow-brown soil and black soil) on the EK-oxidation remediation of copper-pyrene contaminated soil was studied. The results demonstrated that soil pH, clay content and soil heavy metal speciation were the dominant factors affecting the migration and removal of pollutants. In addition, the effect of EK remediation on soil physicochemical properties and soil enzyme activities was discussed. According to the results of this study, the optimal experimental conditoins for simultaneous removal of heavy metals and organic pollutants in the soil were achieved and a patent of invention was applied, which provide the theoretical foundation and technical basis for the EK remediation of heavy metal-POPs compound contaminated soil.

英文关键词： heavy metals; POPs; compound pollution; electrokinetic remediation