Polycyclic aromatic hydrocarbons (PAH) are neutral, nonpolar and hydrophobic molecules that tend to sorb onto soil organic matter. Chemical oxidation is a good choice to avoid the limitations of bioremediation.

To evaluate the efficiency of different types of oxidation (permanganate, hydrogen peroxide, and persulfate) and activation (heat, alkaline, and iron), batch reactors were prepared. The soil was contaminated with phenanthrene and pyrene (1200 ± 200 and 2800 ± 100 mg per kg of dry soil, respectively) and aged for fifteen months. Treatments were prepared with 10 g of contaminated dry soil and 20 ml of water and incubated at room temperature for 7 days. Analyses of phenanthrene and pyrene concentrations, soil pH and electric conductivity were performed. Counts of heterotrophic cultivable bacteria on R2A medium and PAH-degraders were carried out after 7 days of treatment. The persulfate treatment at room temperature, without the addition of activators, achieved better results than treatments with the same doses of permanganate or hydrogen peroxide. All the strategies to improve persulfate treatments yielded higher degradation of pyrene than the biological control, as expected from the structural description of this compound by Clar's model. The thermal activation of persulfate (65 °C for 6 h) led to the degradation of more than 90% of both PAHs after 7 days of treatment.

多环芳烃（PAH）是中性，非极性和疏水性分子，易于吸附到土壤有机物上。化学氧化是避免生物修复的局限性的好选择。

为了评估不同类型的氧化（高锰酸盐，过氧化氢和过硫酸盐）和活化（热，碱和铁）的效率，准备了间歇式反应器。土壤被菲和pyr污染（分别为每公斤干燥土壤1200±200和2800±100 mg）并老化15个月。用10g受污染的干燥土壤和20ml水制备处理物，并在室温下孵育7天。进行了菲和pyr浓度，土壤pH和电导率的分析。处理7天后，对R2A培养基和PAH降解剂上的异养可培养细菌进行计数。与使用相同剂量的高锰酸盐或过氧化氢的处理相比，室温下的过硫酸盐处理（不添加活化剂）取得了更好的效果。正如克拉尔模型从该化合物的结构描述所预期的那样，所有改进过硫酸盐处理的策略均比生物控制产生更高的degradation降解。在处理7天后，过硫酸盐的热活化（65°C加热6小时）导致两种PAH的降解率超过90％。