化学氧化技术修复苯并(a)芘污染土壤试验

Experiment on Activated Sodium Persulfate Oxidation of Benzoapyrene Contaminated soil

苯并(a)芘是高环多环芳烃有机物的典型代表,它具有难降解、高致癌性、高疏水等特性。为了确保公众健康和环境安全,苯并(a)芘污染土壤的修复迫在眉睫。本文先以摇床氧化实验做室内模拟实验,探求Fen-ton试剂和过硫酸钠试剂对苯并(a)芘的降解效果。然后以过硫酸钠为氧化剂,硫酸亚铁和柠檬酸作为活化剂,通过实验室小试详细地分析了过硫酸钠氧化技术下苯并(a)芘的去除效果及其对土壤理化性质的影响。为了确保以上结果能运用到实际工程中,最后通过现场工程中试验证配比可行性。结果表明:2%过硫酸钠添加量和过硫酸钠与硫酸亚铁、柠檬酸的添加摩尔质量比为5:1:1是处理本地块的最佳配比。此配比可为类似工程应用提供理论支撑,为相似污染场地提供数据印证。

As a typical representative of polycyclic aromatic hydrocarbons,benzo(a)pyrene has the char-acteristics of refractory,high carcinogenicity and high hydrophobicity.In order to ensure public health and environmental safety,the remediation of B(a)pyrene-contaminated soil is urgent.In this study,the shaking bed oxidation experiment was used as a laboratory simulation experiment to explore the degra-dation rate of benzopyrene by Fenton reagent and sodium persulfate reagent.Then,sodium persulfate was used as the oxidant,ferrous sulfate and citric acid were used as activators,and the removal effect of benzo(a)pyrene under sodium persulfate oxidation technology and its effect on soil physical and chemical properties were analyzed in detail through laboratory tests.In order to ensure that the above results can be applied to the actual project,the feasibility of the ratio is finally verified by the test in the field engineering.The results showed that the addition of 2%sodium persulfate and the molar mass ratio of sodium persulfate to ferrous sulfate and citric acid was 5:1:1,which was the best ratio for local block treatment.This ratio can provide theoretical support for similar engineering applications and provide data confirmation for similar polluted sites.