【摘要】 电动-氧化修复可同时去除污染土壤中的重金属和有机物,但需要控制合适的条件,因此研究了电动-氧化修复的条件对土壤中多环芳烃(PAHs)和重金属去除的影响。结果表明,阴极安装阳离子交换膜可避免氧化剂与阴极直接接触,提高氧化剂在土壤中的输送效率,PAHs总平均去除率达82.8%,同时可维持土壤pH在中性范围,土壤电导率(EC)变化较小,但对重金属的去除率也较小;控制阴极液pH为酸性,PAHs总平均去除率可达96.2%,对重金属也有一定的去除作用,然而会改变土壤pH和EC。相对来说,阴极安装阳离子交换膜是一种比较可行的电动-氧化修复处理条件,PAHs去除率高,对土壤性质的影响小,但对重金属去除率不高。维持土壤基本性质的基础上,如何同时高效去除PAHs和重金属的条件还需进一步研究。更多还原

【Abstract】 Electrokinetic oxidation remediation can simultaneously remove heavy metals and organic pollutants in soil.But it is vital to control proper concitons.The influence of conditions on removal of polycyclic aromatic hydrocarbons(PAHs)and heavy metals in soil was studied.Results showed that the cation exchange membrane(CEM)at the cathode avoided the direct contact between the oxidant and the cathode,improved the transport efficiency of oxidant in soil and resulted in the removal rate of PAHs of 82.8%.Meanwhile,the soil pH kept at neutral range,and the EC changed little,but the removal rate of heavy metals was not obvious.Controlling catholyte pH acid achieved the removal rate of PAHs of 96.2%together with a certain removal rate of heavy metals,but the soil pH and EC changed drastically.Relatively,the former was a more practical condition since the PAHs removal rate was high and the change of soil basic properties was little,but the removal rate of heavy metal was low.How to simultaneously remval PAHs and heavy metals by electrokinetic oxidation remediation with little change of soil basic properties need to further explore.更多还原