The Study Of Migration Transformation Of Groundwater System Chlorinated Hydrocarbons In The Eastern Area Of A City

Chlorinated hydrocarbon contamination of groundwater is a global problem, in the shallow subsurface investigation of many cities in northern China were found in chlorinated hydrocarbons serious pollution, a serious threat to people’s lives and health. Once chlorinated hydrocarbons into the underground aquifer, a short time is difficult to effectively remove, and will diffuse as time progresses, the threat of neighboring aquifers, the study of the mechanism of chlorinated hydrocarbon migration and transformation of pollutants in the groundwater system has important theoretical and practical significance.Study area is located in a city in eastern Industrial Zone, during the Quaternary loose layer of widely distributed, according to lithology, Quaternary loose layer including sub-clay and clay layers, wherein the clay layer is a major research area of shallow groundwater burial ground. Quaternary loose layer below the Ordovician limestone layer, deep groundwater occurrence for the main study area.Chlorinated hydrocarbons of groundwater pollution. Through the study area 10 surveillance zone sampling survey, detected in groundwater volatile semi-volatile organic compounds 119 kinds, with chlorinated hydrocarbons and BTEX in the majority, and pick from a chlorinated hydrocarbon contaminants out of the eight kinds of concentration than the as a characteristic of high pollutant pollutants distribution studies showed that eight kinds of chlorinated hydrocarbons generally characterized by excessive concentration of pollutants, including carbon tetrachloride exceeded the rate reached 90%.Groundwater aquifer system Adsorption of chlorinated hydrocarbon contaminants, desorption and degradation of the aquifer microbial contaminants of chlorinated hydrocarbons are the main factors leading to changes in the concentration of chlorinated hydrocarbon contaminants in aquifers. The interior is an effective means of dynamic simulation features and characteristics of the aquifer media migration and transformation of pollutants in the study. To determine the main parameters of the model were designed three laboratory experiments, the use of sand and configuration solution samples collected from the study area were tested, respectively strike diffusion coefficient, block coefficient, degradation coefficient and adsorption coefficient.GMS use software to simulate objects as carbon tetrachloride, established a research area of water and solute transport model transformation model, and analyze and validate the simulation results analysis migration and transformation of chlorinated hydrocarbons in groundwater. The simulation results show that changes in the concentration of carbon tetrachloride in the future inconsistencies 10 to 15 years, monitoring different areas, in general, consistent with studies of groundwater trends and changes in the concentration of chlorinated hydrocarbons groundwater flow direction, that migrate along the fault direction from southeast to northwest. Overall, the concentration of carbon tetrachloride in southern decreased gradually, the concentration of carbon tetrachloride in northern study area was a shock rise...