活化过硫酸盐体系原位模拟去除土壤中多环芳烃

以过碳酸钠活化过硫酸钠,氧化去除土壤中蒽、芘及苯并芘3种多环芳烃(polycyclic aromatic hydrocarbons, PAHs),耦合表面活性剂考查该体系对PAHs的去除效果,并进行PAHs原位修复模拟实验。结果表明,过碳酸钠活化过硫酸钠的最优配比为0.67∶1,此时土壤中总PAHs去除率为92.3%。在此基础上,添加2%(质量分数)的表面活性剂,PAHs去除率最高,达97.4%,在原位修复土壤中PAHs去除率也较高,持续反应168 h后,上下层土壤中PAHs去除率均达97.0%以上。

In situ simulated remediation of polycyclic aromatic hydrocarbons by activated sodium persulfate system

A system of activated sodium persulfate by sodium percarbonate was used to remove anthracene, pyrene, and benzoapyrene (PAHs) in soil,and the system complying with surfactants was applied in a simulation experiment of in situ remediation of PAHs. In the case that ratio of sodium percarbonate to sodium persulfate was 0.67,the maximum removal yield of PAHs reached 92.3%. On the basis, as the ratio of surfactants to system was 2%, the obtained highest removal rate of PAHs was 97.4%. Meanwhile, the effect of sodium percarbonate activated sodium persulfate combined with surfactants system to repair PAHs in soil in situ was significant, and the removal efficiencies of PAHs in upper and lower soils were both above 97.0% after 168 h.