ABSTRACT

When crude oil spills on land, it may leach into the soil and reach the groundwater thus posing a threat to drinking water resources. The Niger Delta region provides such an opportunity to study the migration of environmentally important constituents of crude oil in the soil using adsorption models. Soil properties were determined and data obtained from batch equilibrium experiments were applied to nine adsorption isotherms and the characteristic parameters were obtained from the isotherm models. The results show that the clay and organic matter content controlled the rates of infiltration of contaminants into underground water. The correlation values $\left(R^2\right)$ for the isotherms models studied showed that the data from the selected compounds fitted differently to individual isotherms. Adsorption was not monolayer for all adsorbates and the experimental optimum sorption capacity was phenanthrene (100.01 mg g⁻¹), pyridine (33.23 mg g⁻¹), phenol (13.20 mg g⁻¹) and crude oil (10.20 mg g⁻¹). These results indicate that differences in oil residue components and soil property following spillage will determine the type of sorption processes taking place. The model discussed in the study may contribute to the knowledge of the sorption process for technically informed remediation strategy in the Niger Delta region of Nigeria.

摘要

当原油泄漏到陆地上时，它可能会渗入土壤并到达地下水，从而对饮用水资源构成威胁。尼日尔三角洲地区提供了这样一个机会，可以使用吸附模型研究原油中对环境重要的成分在土壤中的迁移。确定土壤性质，将从批次平衡实验获得的数据应用于9个吸附等温线，并从等温线模型中获得特征参数。结果表明，粘土和有机质含量控制着污染物向地下水的渗透速率。相关值$（{\mathrm{[R}}^{\mathrm{2个}}）$等温线的模型研究表明，所选化合物的数据与各个等温线的拟合程度不同。并非所有吸附物都具有单层吸附能力，实验上的最佳吸附能力是菲（100.01 mg g ^-1），吡啶（33.23 mg g ^-1），苯酚（13.20 mg g ^-1）和原油（10.20 mg g ^-1）。 。这些结果表明，溢油后残油成分和土壤性质的差异将决定吸附过程的类型。该研究中讨论的模型可能有助于了解尼日利亚尼日尔三角洲地区的技术知识修复策略的吸附过程。