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Experimental Study on the Adsorption/Desorption Law and Biodegradation on Shengli Oilfield

Author: LiuYaQiong
Tutor: LiuZhiQiang
School: Qingdao Technological University
Course: Environmental Engineering
Keywords: Petroleum pollutants Soil Adsorption / desorption Law Biodegradable Victory
CLC: X53
Type: Master's thesis
Year: 2008
Downloads: 71
Quote: 0
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Abstract


Nearly fifty years, along with the development and utilization of the Shengli Oilfield, a large area of ??soil and water have been polluted to varying degrees, local pollution is more serious. The soil is the material basis for human survival and development, and environmental conditions, if the soil is subject to contamination or pollution load exceeding its self-purification capacity, its viability will decline, or even disappear, and soil pollutants harm plants and humans of life and health, along with the socio-economic structure and function of the ecosystem damage. For hazards, through the static laboratory experiment and simulation studies of petroleum pollutants in soil adsorption / desorption of the law and its microbial degradation, to investigate the feasibility of environmental protection in the oil and gas field development and construction of soil. Laboratory simulation of petroleum contaminants in the soil adsorption / desorption of the law and its impact factors; use of petroleum-contaminated soil, with crude oil as the sole carbon source After repeated domesticated, screening, separation, obtained a The group of petroleum hydrocarbon degradation dominant bacteria; choose as the object of study with a group of natural mixed bacteria, discussed the conditions of its degradation of petroleum hydrocarbons in the water column; bacteria degradation of soil through laboratory simulation experiments, on this basis, The effect of petroleum hydrocarbons. The main contents and results are as follows: 1, soil adsorption of petroleum substances through the conical flask oscillation experiments, studied under static conditions, soil of the petroleum-based substances adsorption kinetics and the main influencing factors. The results showed that the soil adsorption of petroleum pollutants faster, 4h basically reached adsorption dynamic equilibrium; soil adsorption of petroleum pollutants Langmuir adsorption model, correlation coefficient of 0.99. With varying degrees of temperature, salinity and pH on the adsorption. 2, soil desorption of petroleum substances through the conical flask oscillation experiment to study the desorption kinetics of the process and the main influencing factors of soil petroleum substances. The results showed that the soil faster desorption of petroleum contaminants, 6h desorption basically reached dynamic equilibrium; desorption of soil for oil in line with the Langmuir desorption mode, correlation coefficient of 0.99. On desorption, the temperature, salinity, pH, and surfactant value having different degrees of impact. The dominant bacteria after repeated domestication, selection, separation, obtained as sole carbon source by cast them crude petroleum hydrocarbon degradation, degradation of petroleum contaminants. The results show that the desorption of petroleum contaminants in the soil; microorganisms able to promote a certain extent, by the application of nutrients can effectively promote biodegradation of petroleum pollutants and appropriate N / P ratio of 10:1. 3, laboratory simulation microbial degradation of petroleum pollutants late in the experiment simulated petroleum-contaminated soil microorganisms biological degradation of petroleum contaminants. The results show that, 55d degradation under conditions of constant temperature of 30 ℃, inoculation natural mixed soil bacteria and its petroleum hydrocarbon removal efficiency of 42.6%, without inoculated microorganisms blank, its oil removal rate was 31.1% vaccinated advantage of soil bacteria, its petroleum hydrocarbon removal efficiency of 58.7%; inoculated at room temperature the natural soil mixed bacteria, petroleum hydrocarbons removal efficiency of 41.2% without vaccination microorganisms blank , its oil removal rate of 28.3%, inoculated with the advantages of soil bacteria, its petroleum hydrocarbon removal efficiency of 57.1%. Experimental results show that the dominant bacteria in a suitable degradation under the conditions, the filtered better removal of petroleum hydrocarbons.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
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