The Chlorinated Hydrocarbon Pollution Mechanism Of Groundwater System In The Eastern City

As one of the types of halogenated hydrocarbon,Chlorinated hydrocarbon is classified by the difference of its molecules which contains halogen element atoms. Chlorinated hydrocarbons(CAHs) has a special odor as a kind of organic compound, it synthetizes through artificial. It has been widely used in many industries as a good organic solvents and intermediate products. It enters into the groundwater environment because of the reason such as the storage and handling. It becomes the most common pollutant of organic pollution by evaporation, seepage, waste water discharge and other means in the groundwater system. Chlorinated hydrocarbons as an aqueous organic matter, is stabilized and less volatile diffusion in groundwater, It will exist a long-term in the groundwater, it is hard to eliminated by self-purification of water body. Chlorinated hydrocarbon has higher harm to human body health, so the chlorinated hydrocarbon pollution mechanism of pollutants in the groundwater system research has important theoretical and realistic significance.The organic pollution of groundwater in the eastern part is seriously, and the risk problem of drinking water safety increasingly prominent. The region is a major industrial enterprise, a large number of metallurgical, chemical, chemical fiber, petroleum, machinery manufacturing enterprises are concentrated in the area. According to related statistics, the region’s total annual discharge of industrial waste water of about 36 million tons. The waste water through various channels into the groundwater system, and then pollution the groundwater. In this paper, cooperate with the national science and technology major special project " East of one urban underground water depth of chlorinated hydrocarbon processing technology research and application demonstration " project work, the pollution mechanism is researched in the eastern region groundwater system of chlorinated hydrocarbon, it can provides basic data and technical support for the safety of drinking water in the study area and the effective control of the pollution.The main research contents and achievements include:(1) Chlorinated hydrocarbon sources pollution in the groundwater systemThrough survey of hydrogeological condition in the study area, According to the sample point detection information feedback, It is concluded that the study area of chlorinated hydrocarbon pollution main components. Using factor analysis and cluster analysis to cause of chlorinated hydrocarbon pollution of groundwater in the study area of major industrial enterprises are divided into chemical pollution, mechanical and electrical manufacturing sources of pollution, chemical pollution and pesticide pollution in four categories.(2) Characteristics of chlorinated hydrocarbon distribution research in the groundwater systemBased on the analysis of the chlorinated hydrocarbon pollution source, the distribution of pollution sources of the groundwater in the study area, the distribution of different components of chlorinated hydrocarbon around all kinds of pollution sources, the thirteen kinds of typical pollutants were studied, then draw the different components of the chlorinated hydrocarbon distribution diagram.(3)The way of Chlorinated hydrocarbon pollution into the groundwater system wayCombined with the influencing factors of chlorinated hydrocarbon pollution: Industrial layout, "Three wastes" emissions, Drainage channels, Vadose zone permeability, Enterprise pollution, Wastewater irrigation and Pesticide use, Groundwater exploitation in the study area. Partitioning the way of quaternary pore water and fissure karst water pollution, Analyze the main pollution pathway of chlorinated hydrocarbons.(4) Migration simulation of Chlorinated hydrocarbon pollution in groundwater systemConcept the hydrogeological conditions into a physical model, Groundwater flow numerical model and solute transport model characterized by carbon tetrachloride pollutants is established, Comparisons between the measured value and the calculated value, showing full compliance of the simulation values with the measured ones.(5) Pollution mechanism of Chlorinated hydrocarbon in groundwaterThe shallow groundwater pollution mechanism is mainly about leaching by meteoric water, Leakage of drainage ditches, Within the enterprise pollution, Irrigation pollution. The pollution mechanism of deep groundwater is mainly about the pollution infiltration into the limestone exposed area directly, Shallow groundwater diffuse pollution through the broken wall.