| Due to the high speed development of social economy,people increasingly strong demand for crude oil,make more and more the amount of crude oil,it is to bring huge benefits to people at the same time also brought serious environmental damage,a sharp increase in the amount of oil in oil related organic compounds in the environment is very common,become the most common organic pollutants in groundwater.In coastal areas as the main research area,this paper select silt,silty and sandy soil as a representative of porous material,with petroleum hydrocarbon and hydrocarbon migration in the process of hydrological geochemistry as the main research object,through indoor static adsorption experiment and migration of indoor soil column experiment,The relevant experimental parameters and experimental data were obtained,and various formulas and mathematical models were used to simulate the migration and transformation of petroleum hydrocarbons and explore the hydrogeochemical mechanism of petroleum hydrocarbons.The following research results are obtained:(1)Adsorption kinetics experiment,waterfront three aquifer medium(silt,silt and sand)of petroleum hydrocarbon pollutants in a somewhat different adsorption equilibrium time,silt and silty sand in 80 minutes to reach adsorption equilibrium,but sandy soil can wait to 120 minutes to balance,silt and silty sand adsorption quantity is big,The adsorption rate is also faster than that of sand,so it can be known that the adsorption capacity of silt and silt to petroleum hydrocarbon is stronger than that of sand.(2)Isothermal adsorption experiment shows that the isothermal adsorption of petroleum hydrocarbons by three water-bearing media in coastal area has a good fitting effect on Langmuir model,and the correlation coefficient R~2 of the fitting equation is between 0.9895 and 0.9981.(3)The dynamic process of migration of oil-bearing groundwater in aqueous medium was studied by soil column leaching experiment.The results show that petroleum hydrocarbon pollutants will not be completely trapped or completely removed by soil in aqueous medium.(4)In this paper,the interaction between p H,salinity and petroleum hydrocarbons in the vertical migration process is studied through the petroleum hydrocarbon migration column experiment,and the hydrogeochemical mechanism of petroleum hydrocarbons in the migration process is explored.The migration of petroleum hydrocarbons in different water-bearing media is different.The type of water-bearing media has a great influence on the adsorption of petroleum hydrocarbons,and the migration of petroleum hydrocarbons is also affected by many factors,including biodegradation,organic matter,p H,salinity and so on. |
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