Research On Complex Phytoremediation For Petroleum-contaminated Soil In Daqing

Oil leakages are including the petroleum's exploration, storage, transportation, processing, and in the process of petrifaction products as well as the leakage by oil outburst accidents. These leakages can force plenty of petroleum into the environment and lead to pollution. Pollution of oil field soil are an extremely serious issue.In this passage, we choose chernozem, swamp soil, and saline alkali soil, which is the typical, most wide-spread oil staining the soil of Daqing. The typical soil and the high concentration of oil-contaminated soil are mixed according to the proportion of 4:1, 2:1, 1:1, 1:2; with the seeds of the plants in proportion to the distribution of various types of soil with a broad portfolio of cultivation. After a period, the role of composite repair system of plants alter the oil content of the soil test analysis and calculate relative to the blank experiment greasy soil removal, to study the effect of composite plant system rehabilitation, screening out the advantages of the composite plant system. The results show different types of soil, different oil concentrations and the oil removal compound in different plant systems. For example, in the oil-polluted chernozem, Soil-oil ratio 4:1, 1-4 Maryland - Millet - Phlox - Parthenocissus - Japanese Thistle Herb - lettuce combined effects of good repair plant systems, 105 day removal of up to 68.5%; soil-oil ratio 2:1 ,1-1 Motherwort - Asclepiadaceae - step climb - Artemisia sieversiana Willd - clover - Oil Rehabilitation composite plant Artemisia best, 105 day removal rate reached 62.5%.In this passage, pH value, nutrition elements, oil-soil ratios and microbes differently influence factors such as to research how to change the environment to increase degradation rate by the composite plants systems. Hence, the results show the control factors of soil's pH value, nutrition elements, oil-soil ratios and microbes, etc. under certain circumstances in which others factors are not changed. The factors on plant degradation of the petroleum have obvious effects, meanwhile, microbes have promote degradation of the petroleum. While increasing the oil stain quality of the sample, composite plants systems degradation rates shows the decreasing tendency. Meanwhile, this passage is based on the Daqing territorial situation establish a set of composite plants systems of oil stain degradation methods, and evaluate the composite plants systems as they restore the oil-polluted soil. In conclusion, a number of improved soil conditions, enhance the oil degradation rate of effective measures and methods.