A Study On The Influence Of Aged Refuse On The Migration Of Petroleum Pollutants In Soil

With the continuous development of industrial economy,the economic status occupied by the oil industry is becoming more and more important.With the economic development,environmental damage brought by the oil industry is getting serious.During the process of oil exploitation,processing,transportation and use,oil leakage or oily waste water enters the soil and enters the underground water body through the rainfall process,thus causing a series of environmental problems.At the same time,petroleum contaminant in soil accumulate in crops,which will harm human health through the food chain.They have done a lot of work to study how to control the migration of petroleum pollutants through a way,that adding different material to improve the quality of soil.It is rare to use aged refuse as additive to improve the ability to resist pollution.For this reason,this research through the establishment of the lab-scale soil column leaching experiment,what intend to let petroleum pollutant as characteristic pollutant,and put aged refuse to soil with different proportions,to simulation the remediation of petroleum pollutant in soil.And combined with the experiment of adsorption and desorption,establish the mathematical model to explore the effect of aged refuse on the migration of petroleum pollutants in soil,and reveal its action mechanism.This study can provides a new way to the application of aged refuse and control of petroleum contaminated soils,and provides technical support for the practical application and safety research of aged refuae for petroleum-contaminated soil remediation.The main research results are as follows:1.Aged refuse can reduce the migratory quantity and depth of petroleum pollutants in soil.The migration quantity of oil pollutants in soil is positively correlated with the proportion of aged refuse.As follows:the concentration of pollutants in the soil co lumn that aged refuse dosing proportion was 50%was significantly lower than the aged refuse dosing proportion were 0%,10%and 25%.when the proportion of aged refuse was 50%,the migration of pollutants in the soil column was decreased by 35%than the reference soil at 10cm,the migration of pollutants in the soil was decreased by 54%at 15 cm.It was easier to degrade pollutants when the proportion of aged refuse was 50%,because there were more microbial.The concentration of petroleum contaminant,which the proportion of the aged refuse was 75%,was more than the proportion of the aged refuse was 50%.The water quality was tested and found that the concentration of COD,Cl^-and NO^2-accord with the groundwater quality standard?GB/T 14848-2017?in the class II water quality standard,the water of heavy metal,ammonia nitrogen,SO₄^2-accord with the groundwater quality standard?GB/T 14848-2017?in class III water quality standards.2.Aged refuse can improve adsorption of soil for petroleum pollutants.Through the experiment of adsorption and desorption,it was found that adsorption rate in soil,which adding aged refuse,was higher than the soil without aged refuse.The experiment of adsorption and desorption reveal that the adsorption constant D of soil increased from30.2804cm²/d to 34.2460cm²/d when the aged refuse was 50%,it was indicated that the aged refuse can increase the adsorption of soil.By building mathematical model,combined with the parameters obtained from the experiment,to simulate the migrate process of petroleum pollutants in soil with aged refuse,the results show that the aged refuse can reduce the migratory quantity of petroleum pollutants in soil.3.The migration of petroleum-based pollutants in soils containing aged refuse is lower than that in the control soil.The quantity and type of microorganisms in the soil have been improved,and the number and type of microorganisms that degrade petroleum hydrocarbons have increased,making the degradation rate of petroleum-related pollutants increases.In addition,the increase of porosity,the improvement of pH,the increase of organic matter and nutrient elements can also increase the biodegradation of petroleum contaminants.Simultaneous addition of aged refuse increases the adsorption of organic contaminants by soil.Under the combined influence of these factors,the migration of petroleum pollutants has been reduced.