Abstract:

The transport of selected polycyclic aromatic hydrocarbons（PAHs），phenanthrene (Phe)，anthracene (Ant) and pyrene (Pyr)，under conditions with and without bacteriostasis was studied through leaching experiments.The results showed that ,microorganisms inhibited leaching of PAHs with a leaching rate of 8.74％，28.53％ and 13.56％ of Phe，Ant and Pyr respectively after 180 days’ leaching under the condition with bacteriostasis and 0.95％，1.47％ and 0.37％ after 240 days’ leaching under the condition without bacteriostasis. The tested 3 PAHs tended to be attached on the top of the soil under both conditions with and without bacteriostasis with 75% of Phe distributing at 0—2 cm from the feeding side，above 90％ of Ant distributing at 10 cm from the feeding side and 85％ of Pyr distributing at 4 cm from the feeding side after 240 days’ leaching.Microorganisms affected the PAHs transport by blocking and degrading.All of Phe，Ant and Pyr could be biodegraded.Before 60 d，PAHs were mainly degraded through the aerobic process while through the anaerobic process after 60 d.

Key words:

多环芳烃, 土壤, 微生物, 迁移

摘要：

以菲、蒽和芘为研究对象，通过淋溶实验考察抑菌和未抑菌条件下三者在土壤中的迁移过程，结果表明，微生物的存在抑制PAHs淋出：抑菌条件下180 d时菲、蒽和芘的淋出率分别为8.74％、28.53％和13.56％，未抑菌条件下240 d时菲、蒽和芘的淋出率分别为0.95％、1.47％和0.37％。抑菌和未抑菌条件下3种PAHs均易吸附于表层土壤中：淋滤240 d时，约75%的菲分布在进水端0～2 cm;超过90％的蒽分布在进水端10 cm以内;85％的芘分布在4 cm以内;微生物通过阻滞作用和降解作用影响PAHs的迁移，菲、蒽和芘在土壤中都能被土著微生物降解;60 d以前土柱中PAHs降解以好氧降解为主，60 d以后， PAHs的生物降解转为厌氧降解。

关键词:

多环芳烃, 土壤, 微生物, 迁移