Study On The Migration Evolution And Interaction Law Of Organic And Metal Ion Pollutants In Sandy Loam Soil In Petrochemical Parks

The refining process of petroleum may produce a variety of environmentally harmful substances,such as petroleum components,intermediate compounds,final products,spent catalysts,etc.When there is a leak in a petrochemical plant or sludge dump,these pollutants can enter the soil and migrate deeper into the affected rainfall leaching,contaminating the surrounding soil and groundwater.Therefore,studying the migration evolution and interaction law of this part of the material in the soil of the park is of practical significance for the monitoring and control of pollution around the petrochemical park.Based on the above problems,this paper took some potential pollutants common in petrochemical parks,such as petroleum hydrocarbons,polycyclic aromatic hydrocarbons（phenanthrene,pyrene,benzo[α]pyrene）and water-soluble nickel ions(Ni²⁺),and designed a batch adsorption test to study the adsorption characteristics of pollutants in soil and clarify the adsorption kinetics.Soil aging test and soil column leaching test were designed to analyze the relationship between speciation change and migration release of organic matter and Ni²⁺.In order to find out whether there is an interaction between organic matter and catalytic metal components in soil,the speciation change characteristics and migration transportion laws of the two in the coexistence environment were also studied.The results suggested that higher temperature,higher p H and lower ionic strength had positive effects on the adsorption of Ni²⁺in soil.Simulated acid rain leaching reduced exchangeable Ni and carbonate bound Ni,and changes the soil environment,resulting in the release of iron-manganese oxide-bound Ni and organically bound Ni from the soil.The coexistence of organic matter would affect the ironophility of Ni in the soil,increased the content of residual Ni,reduce the release of Ni by leaching and affect the migration of Ni in the soil.The presence of Ni improved the retention capacity of the soil for some organic matter such as PAHs,and reduced the release of PAHs in the soil.This study is helpful to understand the migration and transformation law of pollutants in water-soil media,provide a valuable reference for the reasonable assessment of the risk characteristics of pollutants in the actual environment,and provide a theoretical basis for soil pollution remediation.