| Oil as the blood of industrial development in China,heavy metal content in oil as part of environmental pollution,the distribution of its content is still not clear.In recent years,biological repair with less investment,no two pollution,widely used in oil recovery,in this study, the content of heavy metals in different oil content and the degradation efficiency of petroleum in soil are studied,improved soil by using a biological modifier,to study the effect of heavy metals and degradation in oil contaminated soil,to explore the bioremediation of heavy metals in soil conditions,in the course of the actual work,provide reference for large-scale use of the bioremediation of petroleum contaminated soil.The results of this study are as follows:（1） Soil p H of different oil content is between 7.5 and 6.8,the p H value of the soil in the study area is neutral.Soil p H showed an increasing trend with the total oil content,but the differences between the treatments were not significant.After adding a biological modifier,the soil p H of different treatments was 7.30 to 6.87.Compared with the oil content（60g/kg） of soil（CK）,after adding a biological modifier,elevated p H between different treatments,the performance sequence of soil p H between different treatments was: 2JJ <5JJ< 2JF+ 5JJ <CK.Compared with the soil without oil（CK1）, with the increase of the dosage of the modified agent, the p H of different treatments increased, and the p H of the soil in different treatments was in the order of: 2JJ <5JJ< 2JF+ 5JJ <CK.The soil p H of different treatments with different treatments was 8.44 to 8.19.Compared with CK, the p H of different treatments was decreased after the addition of the biological modifier, and the p H of the soil in different treatments was in the order of: 5JJ+2JF < 2JJ <5JJ <CK.（2） Along with the increase of the oil content, soil available nitrogen, available phosphorus and available potassium content had no change, the soil organic matter content showed an upward trend, and no obvious change law.There was no correlation between soil oil content and soil available nitrogen, available phosphorus and available potassium content. The content of soil organic matter and oil content in soil showed a linear relationship, but not significant.The soil alkaline hydrolysis nitrogen in different treatments showed a decreasing trend, available potassium showed an increasing trend, and the available phosphorus content had no change, and the soil organic matter had no regular change.Compared with the soil without oil（CK1）, the soil available phosphorus content was higher, the alkali solution nitrogen and available potassium was lower, and the soil organic matter of 5JJ+2JF was higher than that of the soil with different treatments.With the increase of the dosage of the modified agent, the organic matter content of each treatment increased, which showed that CK1<2JJ<5JJ<5JJ+2JF.The correlation between the effective nutrient and organic matter in the black soil with different treatments and the addition of 60g/kg was poor.After adding a biological modifier,with the increase of the biological treatment, the soil alkaline hydrolysis nitrogen, available potassium, and the increasing trend of different treatments were increased,the content of available potassium in different treatments had no change, and the soil organic matter showed a decreasing trend.Different treatments of the biological improvement agent and Songyuan oil field soil alkali solution nitrogen, available potassium has good correlation.The correlation between different treatments and the soil available phosphorus in Songyuan oil field was poor.The increase of soil organic matter and soil biological modifier agent, generally show a certain linear relationship, but not significant.（3） In the field soil with different oil content, the heavy metals in the soil did not show a regular change with the increase of oil content.The range of each metal content in the soil is: copper31.1-38.5mg·kg-1,zinc88.6-265mg·kg-1,iron364-466mg·kg-1,manganese466-539mg·kg-1,nickel28.2-35.2mg·kg-1,chromium156-194mg·kg-1,magnesium403-487mg·kg-1.Large amounts of oil in the soil lead to increased levels of copper, zinc, iron, manganese, nickel, chromium, and magnesium in varying degrees,but the heavy metals in the soil did not increase with the increase of oil content.The heavy metals in the black soil of 60g/kg with different dose of biological agent were not changed with the increase of oil content, but the change was not significant.The range of each metal content in the soil is:Cu18.5-22.1mg·kg-1,Zn213-231mg·kg-1,Fe 443-477mg·kg-1,Mn440-466mg·kg-1,Cr109-158mg·kg-1,Ni109-158mg·kg-1,Mg360-462mg·kg-1.C ompared with CK,the variation curves of Zn, Fe, Mn, Cr, Ni, Mg, and Cu in different treatments showed that 2JJ <5JJ<5JJ+2JF <CK, 5JJ+2JF< 2JJ< 5JJ<CK, CK < 5JJ<2JJ <5JJ+2JF, 5JJ+2JF < 5JJ<2JJ <CK, 2JJ< 5JJ <5JJ+2JF <CK, CK <2JJ<5JJ+2JF< 5JJ, 5JJ< 5JJ+2JF< 2JJ< CK.The heavy metals in the soil of Songyuan oil field which was applied in different dose of biological agent did not change with the increase of oil content, but the change was not significant.The range of each metal content in the soil is: Cu 38.2-41.1mg·kg-1,Zn 204-275mg·kg-1,Mn 542-617mg·kg-1,Cr 197-226mg·kg-1,Ni 109-158mg·kg-1.Compared with CK, the variation curves of Zn, Mn, Cr, Ni, Mg, and Cu in different treatments showed that CK<2JJ <5JJ <5JJ+2JF, CK <2JJ <5JJ <5JJ+2JF, CK<5JJ < 5JJ+2JF <2JJ, 2JJ< 5JJ <5JJ+2JF <CK, 5JJ< 2JJ <5JJ+2JF <CK. |
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