Research On Heavy Metals Pollution Characteristics And Evaluation Methods In The Groundwater Of Metal Mines

The mine environmental geological problems that in the development of metal minein China are occupation of land, induced debris flow which caused by mining waste andunreasonable stacked tailings. With the metal mine waste water and waste residue ofheavy metals and other harmful substances content is high, the pollution problems is soheavy.Aiming at the typical metal mine development caused by the process of minegroundwater environmental problems in mines, Carry out the research of the minegroundwater pollution characteristics of heavy metals and the evaluation methodIn depth analysis of the predecessors on the basis of the results of research area,heavy metal pollution, surface water and groundwater on statistical characteristics ofheavy metal content. The results show that during the dry season, surface water Se, Mn,Hg, As, Sb exceed the standard rate is respectively62.5%,25%,12.5%,87.5%,100%, andother heavy metal exceed the standard rate of0; the abundant water period surface waterAs, Sb, Se, Pb, Hg exceed the standard rate is respectively100%,100%,50%,12.5%,12.5%, and other heavy metal exceed the standard rate of0.Dry season water Sb, As, Ni exceed the standard rate is respectively93.8%,70.5%,17.6%,11.1%, and other heavy metal exceed the standard rate of0; theabundant water period of groundwater As, Pb, Se exceed the standard rate isrespectively85.7%,14.3%,14.3%, and other heavy metal exceed the standard rate of0.Research of groundwater in Se, Zn, Mn, Hg content in the dry season than the highwater period, Pb, As, Sb content in the dry season than in high water period; and in thesurface water Mn, Zn content in the dry season than the high water period, Hg, As, Se,Pb, Sb content in the dry season than the wet period. By considering effect of formationsolution, the adsorption effect, except for Pb, Mn field in water, heavy metal content isless than or equal to surface water.Determination of surface and ground water, heavy metal elements and their contentexceed the standard interval, for metal mine groundwater pollution monitoring techniqueand equipment research and development provide a basis. Surface water heavy metalexceed the standard elements of Sb, As, Se, Mn, its contents were0.205-179.07mg/l,0.01-561.54mg/l interval,0.002-0.184mg/l,0.01-0.211mg/l, Sb, As, Se,Pb average concentration exceeds the standards for drinking water (GB5749-2006);heavy metal element of groundwater exceed the standard for Sb, As, Se, Pb, its content ranges were0.003-134.81mg/l,0.01-2.72mg/l,0.002-1.77mg/l,0.01-0.022mg/l, Sb, As, Pb,Se average concentration exceeds the standards for drinking water (GB5749-2006).Groundwater between heavy metals correlation analysis, correlation analysis andother components, and other components of the cluster analysis and principal componentanalysis. Groundwater in the Hg and Pb, As and Zn, Mn and Hg, As and Hg is negativecorrelation. In a high Hg content in sample Pb, Mn, As content is relatively low, the Ascontent in the Zn sample content is relatively low, other sources of heavy metals indifferent. While the pH of the study area the influence of heavy metal elements. Clusteranalysis results show that the study area of heavy metals in groundwater can be dividedinto two classes, Zn, Cu, Mn, Pb, Hg, As, Cr, Cd category. Principal component analysisof Zn, Hg, Pb, Mn, As five heavy metal elements Zn, As, Hg, Pb, Mn, Se and other fivekinds of heavy metals are divided into two main components, with the two maincomponent to evaluation of groundwater pollution of heavy metals have greater than59%reliability, does not conform to the principal component analysis of the cumulativevariance contribution rate is more than80%principles.Main pollution sources, pollution of the study area, pollution through differentpathways and hydrogeochemistry effect, the area of the groundwater pollutioncharacteristics of heavy metal in the main performance are: Sb、As、Pb、Se、Ni, elementanomaly, the average concentration of Sb、As、Pb、Se exceed the standards for drinkingwater (GB5749-2006).With the contents of heavy metals in groundwater statistical characteristics,correlation analysis, cluster analysis, principal component analysis based on thedetermination of heavy metal pollution of groundwater evaluation indexs are: Zinc (Zn),Arsenic (As), Mercury (Hg), Pencil lead (Pb), Manganese (Mn), Selenium (Se).Choose the Nemerow index method, fuzzy comprehensive evaluation method,support vector machine method3kinds of methods to the study of groundwater pollutionof heavy metals was evaluated, and the comparative analysis. Evaluation results showthat the support vector machine method and Nemerow index method can reflect theresearch of heavy metal pollution in groundwater in the actual situation, in addition toconsider Nemerow index method to evaluation of man-made pollution classification,support vector machine method in metal mine groundwater assessment of heavy metalpollution is more application prospects.