陕北风沙滩地区煤矿排水对地下水污染特征分析

摘要

以某煤矿排水池为研究对象,分析煤矿排水入渗对陕北风沙滩地区低本底值地下水的污染特征.以排水池为起点,顺地下水流向和垂直地下水流向共采集27组地下水水样,通过水质分析得出:与地下水本底值相比较,煤矿排水中主要污染离子顺地下水流方向运移距离已达1 371.67 m,垂直地下水流向运移距离已达498.96 m;顺地下水流向上,TDS,SO42-,Na+,Ca2+的超标范围分别大于1 273,1 421,978,1 286 m;垂直地下水流向上,TDS,SO42-,Na+,Ca2+的超标范围分别大于429,446,404,443 m.说明排水池周边地下水受到矿坑排水入渗污染以SO42-,Na+,Ca2+最为明显,导致TDS升高,其运移扩散浓度大于本底值的范围就代表周边地下水受到的现状污染范围.%The pollution characteristics of underground water in northern shaanxi aeolian-sand area were studied by means of a coal mine drainage basin.To pool as a starting point,along the groundwater flow direction and vertical prospecting line construction of shallow groundwater flow respectively,setting out well and use the total people well 27 groups of water samples collected,through the water quality analysis: compared with background value of groundwater,the main pollution in coal mine drainage ion migration distance has amounted to 1 371.67 m in the groundwater flow direction,the vertical ground water flow to the migration distance has amounted to 498.96 m;In the direction of groundwater flow,TDS,SO42-,Na+,Ca2+exceeded the exceeding limit of 1 273,1 421,978,1 286 m respectively.Vertical groundwater flow is higher than 429,446,404,443 m respectively.That row pool surrounding groundwater polluted mine drainage infiltration with SO42-,Na+,Ca2+is most obvious,result in higher TDS,the scope of its transport diffusion concentration is greater than the background value is under the current situation of groundwater pollution around.