外加电场下镍污染土壤离子迁移过程及机理  

Ion Migration Process and Characteristics in Nickel-contaminated Soil under an Electric Field

作　　者：熊钡 邵友元[2] 易筱筠[1] 

机构地区：[1]华南理工大学环境与能源学院,广东广州510006 [2]东莞理工学院化学与环境工程学院,广东东莞523808

出　　处：《环境科学与技术》2015年第6期33-38,共6页Environmental Science & Technology

基　　金：国家自然基金(51176036);2014年东莞市社会科技发展项目:土壤重金属污染治理与修复关键技术研究

摘　　要：通过设计正交实验对镍污染土壤的电动修复进行研究,结果表明,在外加电场下镍离子迁移效果很明显,大部分镍离子迁移到阴极电解液和位置5土壤中,两位置总迁移率基本达到70%以上,且沙土和沙壤土的迁移速度明显比黏土快,沙土最高迁移率达到99.9%,沙壤土最高为68.3%,黏土仅为37.8%,最高迁移率均出现在阴极p H控制为5条件下。极差计算结果表明,对迁移率影响大的因素为土壤类型和阴极p H,在相同土壤类型下,阴极p H则为最重要影响因素,而电压梯度和阳极p H对迁移率影响不明显。由于电压梯度对迁移率影响不大,但对耗电量影响却很大,因此综合分析可得,该次试验最适合的电压梯度为0.5 V/cm。外加电场对土壤p H影响较小,土壤p H均分布在弱酸和中性范围。Orthogonal experiments are designed to study electro-kinetic remediation of nickel-contaminated soil. The results show that, applied electric field has more influence on nickel ion migration, most of nickel ions migrate to cathode electrolyte and position 5 soil, total migration rate of the two position almost reached more than 70%, migration rate in sand and sandy loam is obviously faster than that in clay, with the highest migration rate 99.9% in sand, 68.3% in sandy loam, only 37.8% in clay, and the highest migration rate all appears in cathode pH equal to 5. Range calculation results indicate that soil type and cathode pH are two important influence factors, in the same type soil, cathode pH is the most important influence factor, voltage gradient and anode pH have little influence on nickel ion migration. Because voltage gradient has little influence on nickel ion migration and most influence on power consumption, so the best voltage gradient in the test is 0.5 v/cm. Applied electric field has less effect on soil pH, soil pH is in weak acid and neutral range.

关 键 词：土壤 镍污染 外加电场 电迁移 电动力学修复 

分 类 号：X131.3[环境科学与工程—环境科学]