| As plenty of the tailings were produced by the heavy metal mining resources,the tailing reservoir became the heavy disaster area. What’s more, the heavy metalpollutants were easily released by the leaching of the acid rain. Heavy metalpollutants enter into the groundwater environment, which it can be harm to thehuman health and causes seriously environmental pollution by food chain’s. Therelationship between the groundwater environment and people’s health was by thehealth risk assessment in mine land and surrounding area. It can quantitativelydescribe the hazard degree. Hence, this paper was studied the characteristics of theheavy metals in groundwater based on the analysis of the water environmentpollution around the mine land. The health risks of heavy metal were evaluated inthe flood and the dry seasons. The assessment was benefit to the control of heavymetal pollution in groundwater, and then it promoted the sustainable develo pment ofthe mineral resources.(1) The heavy metal pollution was easily caused by the exploitation of miningresources. The results showed that the pollution of heavy metal in groundwateraround the tailing area was aggravated by the private mining illegally in1984. Thewastewaters in the mining area were easily entered into the groundwater, thegroundwater were deterioration significantly. Because the copper sulfide ore wereexploited vigorously, the copper contents in the groundwater increased year by year.As Caoduikeng tailing area lied in mountain valley, the hydraulic slope was high andthe flow velocity was fast. The longer time the serving time was in the tailing, themore possibility the heavy metals pollution of groundwater in the tailing area caused,which deserves paying much more attention.(2) A systematic survey and determination of Cu,Pb,Zn and Cd concentrationsin the groundwater were studied in the Dabaoshan mineland. The sampling site in thetailing area The results show that the concentrations of all other heavy metalsexcept the simple plot which effected by the tailing area, were lower than the thirdstandard of GB/T14848-93.The heavy metal(Cu, Zn,Pb,Cd) contents in the tailingarea in flood area were higher than in dry area, it was greatly affected byprecipitation, and the contents around the tailing area were inversely correlated. Thecorrelation between the heavy metals in dry seasons is different from the flood seasons. A significance correlation was observed between Cu and Zn,Pb,Cd i n dryseasons, and the Pb content is also significantly related to Cu or Zn. Moreover, thePb was mot significantly related to Cu or Cd.(3) The possible health risk to local inhabitants via consumption and showerwere assessed based on the USEPA health r isk assessment model.The results showedthat the Cu,Pb,Zn and Cd concentrations in the tailing area in the wet season higherthan dry season.The non-carcinogen risk values of Cu,Pb and Zn via consumptionwere mainly in the range of10-10~10-12，and the carcinogen risks were in the rangeof10-11~10-17，which will not cause harm to the health of local inhabitants.Thevalues（Cu,Pb,Zn,Cd）of carcinogen risks in the dry season via shower were mostlyhigher than wet season. The precipitation had little effect. The health risks of Pb andZn in the wet season were higher than the dry season, but the value of Cd risks hadrelated with the distance to the tailing area. In the tailing area the levels of healthrisk were affected by the tailing discharge. Moreover, the heavy metal contents far tothe mining area were affected by the precipitation. Moreover, the carcinogenic riskvalues of Cd in the tailing area exceeded the maximum acceptable levels set by U SEPA. Therefore the pollution of Cd should be firstly taken into consideration ofprevention in the groundwater of the Dabaoshan mineland. |
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