陕北神府矿区地下水污染评价

Groundwater Contamination Assessment of Shenfu Mining Area in Northern Shaanxi Province

神府矿区身为国家级陕北能源化工基地的核心区域,地处神府煤田腹地。通过对神府矿区地下水污染现状野外调查,采集水样,室内、室外分析化验,对地下水水污染进行评价。地下水污染程度采用层级阶梯评价,在此基础上按无机毒理指标和微量有机指标将地下水的污染划分为四级,并做地下水污染风险分区图。神府矿区地下水污染的影响指标为NO_3—N、NO_2—N、F^-、Mo和Cr^(6+),其中NO_3—N影响程度最高,说明地下水主要污染来源于工矿企业生产和生活废物,全区大部分地区污染程度为中等偏高,污染程度高的地区沿地下水水流方向的上游分布着较多重污染型企业,说明导致地下水污染的原因除生活污染外,工矿企业已经对水源保护区内局部地下水造成了不同程度的影响。

Shenfu mining area is the core area of the national energy and chemical base in the north of Shaanxi Province.It is located in the hinterland of Shenfu coal field. Through the field investigation of groundwater contamination in Shenfu mining area,water samples were collected,indoor and outdoor analysis tests were conducted to evaluate groundwater contamination. The groundwater contamination degree was evaluated by hierarchical staircase. On this basis,the groundwater contamination was divided into four grades according to the inorganic toxicological indicators and trace organic indicators,and the groundwater contamination risk zoning map was made. The influence indexes of groundwater contamination in Shenfu mining area are NO3-N,NO2-N,F-,Mo and Cr6+,among which NO3-N is the most influential factor. Therefore,the main pollution of groundwater comes from the production and living waste of industrial and mining enterprises. The degree of pollution in most areas of the middle high,high level of pollution in the upper reaches of the groundwater flow direction along the distribution with multiple pollution enterprises,that lead to groundwater pollution in life pollution,industrial and mining enterprises have the water source protection area of local groundwater caused by the influence of different degree.