Biochemical Characteirstics Analysis And Water Quality Evaluation Of Underground Water Of Datong Mining District

Based on the underground water of Datong mining district as the researchobject, through the investigation of pollution sources, pollution situation andhydrogeology, collected in the previous monitoring data of water quality, water level,weather and experimental operation. Based on the data of the22groundwatermonitoring well and the distribution pressure station, I have done the followingseveral aspects of research work and results:1Found out the status of the underground water resources, the dynamicchange and pollution. Analysed the main routine quality index and metal index, drawthe conclusion: Hardness, total coliforms and chloride are the high content oftotal.They are also the main factor affecting the groundwater quality. Comparison ofthe water quality of Shizhuang and Xiawozhai, the water quality of Xiawozhai isbetter. Metal indicators are qualified, but the nickel content of Shizhuang19#andJichang station is high content. May be the waterpipe is loss and old.2Analysis biochemical characteristics of the underground water of Datongmining district, draws the conclusion: with the increase of the intensity of humanactivities, the degree of deterioration of groundwater quality are rising. From thebeginning of1995various ion appeared obvious changes, mass concentrationshowed a rising trend, this time human activities began to significantly affect thequality of groundwater. Before1995, basically, hydrochemical characteristics ofgroundwater is mainly controlled by various natural conditions. Human activities ongroundwater in Datong mining area affect the strength of industrial activity area,secondly in agricultural activities, again in the light of human activities. From thebeginning of2002, the nitrate concentration of industrial activities and agriculturalactivities in the sharp increase of groundwater, groundwater in the othercomponents (except SiO2) rates are generally higher than that of the early.3Research the temporal and evolution rule of the groundwater quality byintensive human activities affect, draws the conclusion: Datong mining areagroundwater flow field has changed, the formation of local hydrological and geochemical anomalies, resulting in groundwater chemical field redistribution. Waterwith low salinity bicarbonate saline gradually narrowing the scope, high degree ofmineralization of sulfate, chloride water gradually expanded the scope; with thecontinuous pumping, groundwater pumped from the original bicarbonate saline intosulfate, will eventually turn to chlorinated water.4To explore the Datong Mining hydrogeochemical zonation, i.e. creatively studydivided into groundwater recharge zone (not affected zone), groundwater runoff area(agricultural activities influence zone) and discharge area of groundwater (industrialactivities influence zone). These hydrochemical zonation will provide scientific basisfor formulating and implementing policies of Datong mining area groundwater.Theconventional single pollution index of evaluation and fuzzy mathematicscomprehensive evaluation method for the Datong coal mine underground drinkingwater quality evaluation, results show that: the portion of the total hardness,detecting the sample of chloride and total coliform bacteria exceed the standard, thecontent of total dissolved solids, sulfate, nitrate, nitrite is generally high, but notexceeding the country standard. Comprehensive evaluation of Datong mining areathe groundwater quality is grade of slightly polluted water.The change of waterquality2001-2011ten years trend by using coefficient of correlation analysis, resultsshowed that: Although individual index showed a downward trend, but the overallquality is deteriorating. Development status of Datong mining area the groundwaterquality is not optimistic.