Study on shallow groundwater quality impacted by Chenjiachong Sanitary Landfill
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Abstract:
Landfill is currently the primary way to handle the municipal refuse in China. However, the groundwater quality will be deteriorated by landfill leachate, which may become one of the main sources for the current water pollution. In this study, a municipal landfill in Wuhan City was selected to investigate its effects on the adjacent groundwater environment. Groundwater samples were collected from eight boreholes and these samples were analyzed to assess the current groundwater quality in the studied area. The results show that groundwater samples are mainly polluted by Pb, Cd and Fe. The pollutant concentrations increase with the decrease of sampling depth and the decrease of the distances between sampled wells and landfill site. The groundwater pollution impacted by landfill leachate was mainly within a distance of 800 meters and a depth of 5.5 meters. The human health risk assessment was performed to further investigate the potential human health risk exposure to the polluted groundwater in the studied area. The results show that the total risk values of the studied groundwater samples are within a range of 2.71×10-4 a-1 ~ 7.12×10-3 a-1, which is higher than the value recommended by the International Commission on Radiological Protection(ICRP), 5.0×10-5 a-1. The human health risk was mainly induced by exposure to pollutants including Cd, Cr(VI) and nitrate. Cd and nitrate of all the studied groundwater samples were with a potential human health risk higher than 5.0×10-5 a-1 and 50% of the samples were with a potential human health risk, induced by Cr(VI), higher than the recommend ICRP value. In addition, the results show that men's health risk value is generally higher than women exposure to the polluted groundwater.
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