加油站泄漏污染物的迁移分布规律

选择某废弃加油站场地为研究对象，通过采集分析土壤和地下水样品中的铅（Pb）、总石油烃（TPH）、多环芳烃（PAHs）、苯系物（BTEX）、甲基叔丁基醚（MTBE），分析了污染物在该区域地下环境中的迁移和分布特征.测试结果表明：场地包气带和含水层介质岩性以砂质粉土、粘质粉土和粉质粘土为主，土壤样品中总石油烃（C < 16）和苯均存在超标现象；垂向污染物高浓度值多出现在地下水面附近，其中上层滞水区总石油烃和苯大面积超标，潜水中总石油烃（C < 16）、苯及MTBE超标，承压水尚未被污染.在分析目前石油类污染场地修复技术的基础上，结合场地的实际条件，建议土壤和地下水的修复主要采用异位修复技术.

The underground migration and distribution of petroleum contamination at a gas station

This thesis studied a gas station site that has been polluted by leaking petroleum contaminant. Samples of soil and groundwater at the site were collected and analyzed. The concentrations of lead, total petroleum hydrocarbons (TPH), polycyclic aromatic hydrocarbons, benzene series, and methyl tert-butyl ether (MTBE) were analyzed, and their distribution and migration characteristics in soil and groundwater for different functional areas were discussed. The lithology of the aeration zone and aquifer were dominated by sandy silt, clayey silt, and silty clay. The main pollutants in the soils were TPH (C < 16) and benzene. Analyses in the vertical direction revealed very high concentrations of contaminants close to the groundwater table. In areas of perched groundwater, the main pollutants were TPH (C < 16) and benzene. For phreatic water the main pollutants were TPH (C < 16), benzene, and MTBE. The confined groundwater was uncontaminated. The study recommended that in situ restoration technologies should be applied to the soil and groundwater. This recommendation was based on an analysis of remediation carried out at other petroleum-contaminated sites, and the conditions at the study site.