含水层介质对石油类污染质的吸附特征研究

 东北某石油采区由于输油管道锈蚀而发生石油泄漏,对地下水造成了一定的污染,含水介质的吸附作用对石油类污染质的迁移转化具有重要影响.根据该地下水石油类污染场地水化学测试结果,结合其典型的地质及水文地质条件,通过吸附动力学和等温吸附实验,以最大吸附量、吸附速率、吸附动力学常数等为定量指标,分析该地区的含水层介质对石油类污染质的吸附特征.研究结果表明,含水层介质对石油类污染质的吸附动力学规律符合准二级动力学模型,吸附量与含水层介质的比表面积成正比,吸附作用主要为物理吸附作用;含水层介质对石油类污染质的等温吸附规律为非线性等温吸附;由Langmuir 模型结果可知,含水层介质对石油烃的吸附量及吸附速率由大到小顺序为粉土、粉砂、细砂.实验结果为研究石油类污染质在含水层的迁移转化规律及修复技术提供可靠的科学依据.

Adsorption Characteristics of Petroleum Hydrocarbon Pollution in Aquifer Media

Because of the petroleum pipelines corrosion in northeastern China, the groundwater would be polluted by the hydrocarbons and the adsorption by aquifer media would have impact on the transport of hydrocarbons in aquifer. According to the test results of groundwater quality, combining with the hydrogeology conditions, by means of the kinetics and isothermal experiments of adsorption, taking the largest adsorption, absorption rate, and adsorption dynamics constant as quantitative indices, the adsorption characteristics of the aquifer medium to petroleum pollution in the regions are qualitative analyzed. The results show that the adsorption dynamics law involving aquifer medium to petroleum pollution are complied with two class dynamics model, adsorption volume is proportional to the specific surface area of aquifer medium, the major adsorption effect is physical adsorption effect; the isothermal adsorption law of aquifer medium to petroleum pollution is nonlinear isothermal adsorption; based on Langmuir model, by colloids, adsorption quantity and adsorption rate for aquifer medium to petroleum hydrocarbon by the order from large to small are silty, silty sand, and fine sand. The above experimental results provide the reliable scientific basis for the further study on the gas transform rule for petroleum pollutant in aquifer media and relevant repair technology.