Evaluation Of Ground Water Pollution And Three Nitrogen Transport In Ground Water On Typical Contamintated Sites In Shenfu Mining Area

Shenfu mining area in northern Shaanxi, Shanxi, Shaanxi, Mongolia provinces (regions) border zone, located in the hinterland Shenfu coalfield which is the core area of national energy and chemical base in northern Shaanxi. However, it belonges to the arid and semi-arid temperate continental monsoon climate, precipitation, strong evaporation, water shortages, fragile ecological environment, land desertification and soil erosion. Especially in recent years, with the development of mineral resources and infrastructure to accelerate the pace of construction, rapid regional economic and social development, mines and towns continued to expand, increasing the demand for water, while the exploitation of coal resources and coal chemical production enterprises have varying degrees of environmental problems caused by the depletion of water resources, pollution of groundwate and other environmental problems. Therefore, study of Shenfu mining area groundwater quality evaluation, pollution of groundwater, contaminant transport, the effective prevention and control of groundwater pollution, underground water resources protection, as the area to implement pollution prevention plan has important theoretical value and practical significance.Based on the China Geological Survey Bureau issued "the main city of northwest area groundwater pollution investigation and evaluation" project, in Northern Shaanxi evaluation of groundwater pollution investigation, taking the underground Shenfu mining area of shallow water as the research object, the comprehensive utilization of data collection, industrial and mining enterprises pollution source investigation, sample collection and theory analysis, system research on Evaluation of groundwater pollution and antifouling performance of Shenfu mining area.According to the75group of groundwater samples test data acquisition the groundwater pollution survey, using the single index evaluation method, the Nemero index method and fuzzy comprehensive evaluation method to evaluate the quality of groundwater. The single index evaluation results show that exceed the standard TH, Mg2+, Mn, Fe and other components are the major factors affecting the quality of groundwater in the study area; according to the Nemero index, the groundwater in the study area are super class III water ratio reached68%; fuzzy comprehensive evaluation results showed that in the study area, more than1/4of the water is unfit for drinking. Combined with the environment background values of groundwater in the study area to evaluate the groundwater pollution in Shenfu mining area, the results of this study show that the groundwater pollution and light pollution without water, influence of groundwater pollution in the area were mainly NO3-, NO2-, F-, Cr6+and Mo etc..The groundwater numerical simulation of two-dimensional simulation of groundwater flow in the study area is a typical contaminated field and "three nitrogen" contaminant transport numerical flow, mathematical model. Based on the field measured data and the calculated results of the model of groundwater model identification and inspection, migration and the change tendency of eliminate pollution source after the prediction of underground water "after20years, three of nitrogen pollutants in the site" existing pollution extent.Based on the DRASTIC model, combined with the actual situation of the study area, select the depth of underground water level, media of vadose zone, aquifer lithology, precipitation infiltration coefficient and conductivity of aquifer5Influence Factors of groundwater vulnerability, the index calculation model superposition method, to evaluate the vulnerability of groundwater survey.