| For Huaibei mining area,the aquifer set,located in the central layers of the thick loose-bed seam(abbreviated as "mid-layer water"),is the major water supply.The shallow water overlying it is connected with the supergene environment of the mining area.Due to the large amount of water supply from industrial and mining enterprises and residents,and the complex environmental factors in mining area,the environmental quality of mid-layer water have been widely conceemed by the residents of mining areas.This paper took as an the research area of Sulin mining area(Sunan-Linhuan mining area)in Huaibei mining area,and sampled and tested the mid-layer water and shallow water.The study aimed to analyze the hydrogeochemical characteristics and relationships of major ions?trace elements and environmental isotopes for shallow and mid-layer water;to evaluate mid-layer water environmental quality;and to discuss the geochemical evolution of the mid-layer water,laying the scientific foundation for water development and utilization,and water supply safety.The main research results are as follows:(1)The study expounded the content characteristics of conventional components in shallow and mid-layer water in Sulin mining area.Based on Gibbs plots and principal component analysis,the source analysis of conventional components in water was carried out and the mechanism of water-rock interaction was also revealed.The water quality difference and relationship between shallow and mid-layer water were effectively judged by the variation degree of TDS,F-,NO3-et al.(2)Through the analysis of trace elements abundance in water,it was found that the contents of Mn and Sr in shallow and mid-layer water were high(the content of Mn exceeded the standard values),while the content of other trace elements did not exceed the standard values.In addition,the order of enrichment rate of trace elements controlled by pH was Sr>Mn>Ba>Li>Mo>Zn>Ni>Rb>Cu>Cr>Cd>Pb.(3)Based on the analysis results of D and 18O,the linear equation of isotopes in different water bodies(the evaporation line is δD=4.8δ180-13.6,shallow water line isδD=5.4δ18O-12.5,mid-layer water line is δD=6.1δ18O-10.4),which provides a scientific basis for the study on the recharge sources of shallow and mid-layer water.(4)Based on the analysis of the historical monitoring data for the conventional ions components of mid-layer water,the evolution characteristics of the conventional components and hydrochemical types were analyzed in different periods,and the evolution in space and time of water-rock interaction and groundwater flow field were discussed by using the contour map of ion combination ratio,principal component load score and TDS.(5)Using single factor method,modified Nemerow index method and fuzzy analytic hierarchy process to evaluate the environmental quality of mid-layer water.The results showed that the conclusions of different evaluation methods were slightly different,but the comprehensive result was that the mid-layer water quality was good.(6)Wiih the help of Crystal Ball software,the health risk assessment of trace elements in mid-layer water was carried out by using Monte Carlo simulation.It was found that the carcinogenic risk of Cr was higher that that of Cd.Moreover,the probabilistic distribution characteristics of total non-carcinogenic risk and total carcinogenic risk showed that those trace elements did not pose a threat to human health seriously.Figure 42 table 29 reference 156... |
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