电活化过硫酸盐氧化修复石油烃污染土壤研究

Research on Remediation of Petroleum Hydrocarbon Contaminated Soil by Electrokinetic Activated Persulfate Oxidation

石油烃污染土壤修复研究已成为当前关注的热点与重点,但目前的修复方法存在处理成本高、修复时间长、污染物矿化不彻底等问题,本研究采用电活化过硫酸盐氧化技术修复石油烃污染土壤,通过循环伏安曲线分析验证电活化,考察了pH值、过硫酸盐浓度、水土比和电场强度对土壤中石油烃降解速率的影响。结果表明,在9000~27000 mg/kg的浓度范围内,电活化过硫酸盐氧化对石油烃的降解率为83.3%~98.7%,最佳条件为pH=7.0、过硫酸盐初始浓度为1mol/L、水土比1∶2、电场强度1.5V/cm。该方法能够实现土壤石油烃的快速高效修复,为石油烃的降解及有机污染土壤的原位快速修复提供了重要的基础理论和参考借鉴。

The remediation of petroleum hydrocarbon contaminated soil has been the focus of current attention,but the current remediation methods have some problems,such as high treatment cost,long remediation time and incomplete mineralization of pollutants,etc.In this study,the electrokinetic activated persulfate oxidation technology was used to remediate petroleum hydrocarbon contaminated soil.The electrochemical activation was verified by cyclic voltammetry curve analysis,and the effects of pH,persulfate concentration,liquid-solid ratio and electric field intensity on the degradation rate of petroleum hydrocarbons in soil were investigated.The results showed that in the concentration range of 9000~27000 mg/kg,the degradation rate of petroleum hydrocarbon is 83.3%~98.7%.The optimal conditions are pH=7.0,initial concentration of persulfate is 1 mol/L,liquid-solid ratio is 1:2,and the electric field intensity is 1.5V/cm.This method can achieve rapid and efficient remediation of petroleum hydrocarbons in soil and has important significance for the degradation of petroleum hydrocarbons and other macromolecular organic pollutants.