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Outline
Continuous sampling and analysis of characteristic pollutant concentrations were conducted on the wastewater from a closed uranium mine discharge outlet and surrounding surface water from 2020 to 2024. The monitored characteristic pollutants included U, 226Ra, 210Po, 210Pb, Cd, Mn, As, and pH. Using the Mann-Kendall test to analyze the spatiotemporal distribution characteristics of characteristic pollutants in wastewater, and using the Nemerow Index method to evaluate the ecological risk of surrounding surface water. The results show that during 2020—2024, the concentrations of characteristic pollutants in wastewater and surface water meet the limit requirements, and the concentrations of U, 226Ra, Mn, and As in surface water are generally higher than those in the control points. The Mann-Kendall test results indicate that from 2020 to 2024, the concentrations of U, As, and Cd in the wastewater discharged from uranium mines are effectively controlled and show a significant downward trend. The ecological risk analysis of monitoring data from six surface water sampling points using the Nemerow Index method shows that the pollution factors that have a significant impact on surface water are U natural, 226Ra, and Mn. In the process of long-term monitoring of the closed uranium mines, the focus is on the concentration changes of U, 226Ra, Mn, and As in wastewater, as well as U, 226Ra, and Mn pollution factors in downstream surface water.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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