The Health Risk Assessment Of Groundwater Pollution In Nanyang

With the rapid growth of economy, the urbanization and industrialization process is speeding.A series of environmental problems also emerge, the situation of groundwater contaminationbecomes more and more serious. Due to characteristics of groundwater, it is difficult to manageonce they are contaminated. With the complex and varied sources of contamination, themanagement of ground-water pollution becomes more difficult. Therefore, to prevent furtherdeterioration of groundwater is particularly important, and the health risk assessment canprovide a scientific basis for groundwater pollution control.The issue makes the NAS four steps as the foundation, access health risks of some pollutantsin groundwater of Huai River basin near Nangyang. Including organic pollutants DDT, BHC,inorganic pollutants nitrate, nitrite and heavy metal Mn. Access to the typical pollutants ofcarcinogenic and non-carcinogens value at risk, and use the Monte Carlo method to do theuncertainty analysis for the results, obtained the risk probability distribution, which makes theresults of assessment more reliable.The results show that nitrite in the groundwater are on a higher non-carcinogenic risk level inthe research region. DDT, Nitrite and Mn are on a lower level of non-carcinogenic risk,although relatively lesser harmful to human body, but also cannot be ignored. And thecarcinogenic and non-carcinogenic risk of BHC is low, it is within the range which human bodycan accept. But it still needs to strengthen management, control in time and prevent thedeterioration. The groundwater of the north and west region in the study area is slightly polluted,while the eastern and southern region is heavier. The most serious pollution area lie in Nanyangcity, due to the developed industry and human activities on the groundwater.