The Simulation And Analys For The Sudden Organic Pollutions Residual In The Pollution Ice Body On The Ice Age

In recent years, with the acceleration of the production、industrial and agriculturalactivities, sudden environmental accidents occur frequently.Due to characteristic of suddenaccident, it can caused tremendous harm on the people’s production and life, especiallyorganic pollution incidents, the destroy is even more greater, such as the november13,13of2005, the benzene plant workshop of China Petroleum Jilin Petrochemical Company wasexplosion, the sewage discharged into the Songhua River through the East of the10th lineof the Jilin Chemical Industrial Company,after this accident,which main contaminations thenitrobenzene and benzene.The accident caused a major water pollution in the SonghuaRiver basin, and has brought serious impact on the watershed residents living in coastal,industrial and agricultural production,and has security harm to the watershed ecologicalenvironment. At the time of the accident, the Songhua River has initially formed icesheet.This time called the glacial icy period. In accordance with its environmental chemicalcharacteristics, the main pollutant nitrobenzene has strong stability analysis, so part ofpollutants will be stuck in the ice and riverbed sediment at the pollution through thegroup.Organic toxicants pollution is difference between the frozen and non-frozen period,and more serious, therefore，strengthen the river frozen period of organic pollutionprevention, is the key to solve the organic pollution of rivers.This article is based on theSonghua River pollution incident, its emissions of nitrobenzene as the main pollutants,through reasonable simplification of the actual situation, established the simulation modelin order to study the ice freeze.In the early closure period of the high-latitude regions, when the accident Pollutionoccurs, the pollutants will discharged into the river with ice process, so pollutants could bestored up in the ice and released when the ice melts in spring, perhaps resulting insecondary pollution in the river. Based on multiphase flow theory, this paper establishtwo-dimensional river model along flow direction. Through simulation andcalculation, we can calculation residue content of nitrobenzene in polluted ice；know thespace distribution law of nitrobenzene in the polluted ice body and thetemperature&concentration which can impact the nitrobenzene residues in the ice pollutedbody；then applied the results of the simulation to the Songhua River, so as to knowSonghua nitrobenzene residues in each cross-section of the river、the freezing of icecapability and its impact on the water quality；Finally,verify the simulation results with the Songhua observations and calculated data. The results showthat:the lower the temperature,the lower the rivers of nitrobenzene concentration, the maximum concentration in the bodyof ice is higher; nitrobenzene concentration in the same and similar imported frozen timesituation, the lower the temperature, the ice thickness is larger, the average concentration ofnitrobenzene pollution ice body is also larger, so the nitrobenzene residues is greater; in thesame temperature and freezing time, the concentration of nitrobenzene in river is large, theaverage concentration of pollution, in ice body is large, but the ice thickness decreases, sothe contamination of ice in nitrobenzene residues are not simplyincreasing and decreasing,in a certain limit, nitrobenzene residues decreases with the concentration of pollutants in theriver, but beyond the certain limit, the concentration of pollutants in the river increasing, theresidue of nitrobenzene in the pollution ice body also increases; based on Songhua Riverobservation data, the ice melts in the spring Nitrobenzene was out after the release of thevery small, effect on water quality of time and limited in scope, will not cause two pollutionof water body.