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| Groundwater quality characteristics and health risk assessment in Longnan zudong rare earth mine |
| Received:September 14, 2020 Revised:September 30, 2020 |
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| DOI： |
| KeyWord:Ionic rare earth; Groundwater pollution; Ammonia nitrogen; Nemerow index method; Impact assessment |
| Author | Institution |
| 陈仁祥 |
江西省核工业地质局二六四大队 |
| gaoyang |
东华理工大学 水资源与环境工程学院 |
| 宋 勇 |
江西省核工业地质局二六四大队 |
| 王太伟 |
江西省核工业地质局二六四大队 |
| 高 柏 |
东华理工大学 水资源与环境工程学院 |
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| Abstract: |
| With the over-exploitation of ion-type rare earth ore for a long time, it is urgent to control the ecological environment of its mining area and its surroundings. In order to provide scientific basis for remediation of groundwater pollution in mining area and surrounding areas caused by in-situ leaching mining technology, groundwater monitoring was carried out in Longnan zudong rare earth mining area, comprehensive underground water quality assessment and exposure risk assessment were carried out by using modified Nemerow index method and health risk model. The results showed that the pollutants moved slowly in the groundwater during leaching and had great influence on the shallow groundwater. With the increase of distance and time, the pollutant concentration decreased. The groundwater quality in the mining area was extremely poor. The lead exceeding standard rate was 31.71%, the sulfate exceeding standard rate was 4.88%, and the ammonia nitrogen exceeding standard rate was 53.66%. The migration distance of ammonia nitrogen was 3500 meters. The health risk index of groundwater pollutants in this area was lead > ammonia nitrogen > nitrate nitrogen > nitrite nitrogen, and the non-carcinogenic risk index of young children, children and adults exceeded the standard rate of 7.32%, 4.88% and 0.48% respectively. |
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