Study on Micro-Biological Degradation of Diesel Oil Cooperated with Plants

With the rapid development of the petroleum industry, a large number of oil contaminants leaked into the soil in the petrochemical complex areas, gas stations, automobile factory and other places, which resulted in serious soil and groundwater contamination. Micro-biological degradation of oil pollution is the focus of the present study, while the mechanism of mutual promotion and restriction of restoration system of microorganisms cooperated with plants will also be investigated. It is an effective method to grow plants in the contaminated soil to improve the environment and promote microbial degradation. The alfalfa and mustard may enhance the activity of strain and the ability of consortium in the degradation of oil with more developed root systems, as well as faster growth rates. Then in this study, the strains capable of metabolizing diesel oil were isolated from soils polluted by diesel in the gas station. It´s found that the existence of alfalfa and mustard could promote the degradation of diesel oil significantly. The existence of plant and the growth of roots may have changed the soil environment to make it more suitable for the growth of strains and degradation. In addition, the number of strain in the mustard rhizosphere was larger than that in the alfalfa rhizosphere, which showed that mustard had stronger ability on the activation of strains. In the experiment, Rhodococcus Q18-Indian mustard complex had the highest rate of degradation of diesel oil.