Spatial Distribution And Multimedia Fugacity Environment Behavior Of Pahs In Beiyun River Basin Of Beijing

Multimedia environment fugacity model is a mathematical model to study the environmental behaviors of pollutants, which can effective quantitative analysis of pollutant migration and tending towards rule. This study Using gas chromatography mass spectrometry(GC-MS), analyses the north canal(Beijing segment) in drought and rain seasons of surface water, suspended matter and sediment PAHs levels, characteristics of seasonal change and source analysis and applies Ⅲmultimedia environment model method,to research the environment behavior of typical PAHs in the north canal basin(Beijing segment).North canal basin(Beijing segment) of PAHs in surface water and suspended solids distribution presents the changing seasons, content in the rainy season is higher than the dry season. Dry season to the average content of PAHs in water is 0.17 μ g/L, the average contents of PAHs in the suspended solids is 0.15μg/L. The rainy season of PAHs in water content to an average of 0.43μg/L, the average contents of PAHs in the suspended solids is0.24 μ g/L. The average contents of PAHs in the sediments of 1000.70 ng/g.On the composition, the third and fourth ring PAHs accounts for a large proportion.Survey 2013 residents of coal, industrial coal, industrial fuel quantity, amount of straw combustion and vehicle mileage in the north canal basin(Beijing segment), collect different fuel use of PAHs emission factor in the process, get the main contribution of the PAHs emissions.Through ratio method and main factor analysis method, qualitative analytical study area source of PAHs, and through the emission factor method, quantitative calculation concluded that the main source of PAHs, coal combustion, traffic sources, biomass burning.Simulate the typical of PAHs concentration distribution and tending towards north canal basin(Beijing segment). Estimation of PAHs emissions as input values of the model,in accordance with the input and output balance principle, establish Ⅲ fugacity model.Model is divided into atmosphere, water, soil, sediment, calculation of typical PAHs concentration distribution in the environment, water phase between measured and simulated values of PAHs vary within a logarithmic unit, sediment phase between measured andsimulated values of PAHs slightly higher than a logarithmic unit, and the fitting results are good, the results show that soil and sediment PAHs is the main link.Simulation and migration behavior of typical PAHs, and migration flux calculation, the results showed the typical PAHs in the main migration process is: migration of air and soil,migration of water and sediment, migration of air and water,the main way to quit is the degradation. Through sensitivity analysis, obtains the main factors influencing the concentration of pollutants. Calculate the concentration of typical PAHs in surface water and sediment.The surface water and sediment of PAHs concentration of risk assessment for many years in the north canal basin, less risk of water, there is a risk in sediments.