过氧化钠氧化修复多环芳烃污染土壤活化剂研究

Research on the activator for the remediation of polycyclic aromatic hydrocarbon contaminated soil by sodium peroxide oxidation

化学氧化技术常用于治理土壤或者地下水中的石油烃、挥发性有机物、半挥发性有机物、氯代挥发性有机物、农药等大部分有机物。选择过硫酸钠类药剂作为氧化药剂,每吨土壤投加30 kg(3.0%)修复药剂。设计了二价铁和生石灰两种活化方式:A组将亚铁盐活化剂配制成质量分数一定的溶液,B组以石灰作为活化剂。两组分别投加3.0%的氧化药剂,混合均匀,最后加水调节含水率,养护168 h后检测样品中多环芳烃的浓度和pH。分析上述实验中各污染物的去除率,确定最优活化方式以及合适的活化剂投加比例。

Chemical oxidation technology is commonly used to treat most organic compounds such as petroleum hydrocarbons,volatile organic compounds,semi volatile organic compounds,chlorinated volatile organic compounds,pesticides,etc.in soil or groundwater.Sodium persulfate was chosen as the oxidant.The amount of soil added per ton was designed as a 30 kg(3.0%)repair agent.Two activation methods were designed:ferrous salt activator was prepared into a solution with a certain mass fraction in Group A,and lime was used as activator in Group B.In the two groups,3.0%oxidation agent were added,mixed evenly,and finally water was added to adjust the water content.After 168 h of curing,the concentration and pH of the polycyclic aromatic hydrocarbons were tested.The removal rate of each pollutant in the above experiment was analyzed to determine the optimal activation model and the appropriate proportion of activator.