Migration and fate of metallic elements in a waste mud impoundment and affected river downstream: A case study in Dabaoshan Mine, South China

Ecotoxicology and Environmental Safety
Meiqin ChenZhi Dang

Abstract

Fate of metallic elements and their migration mechanisms in a waste mud impoundment and affected downstream were assessed. Physicochemical and mineralogical methods combined with PHREEQC calculation, statistical analysis and review of relevant literatures were employed. Results showed that the waste in mud impoundment had been severely weathered and acidized. Metallic elements exhibited high mobility and activity, with a mobility ranking order of Cd > Zn > Mn > Cu ≈ Cr > As ≈ Pb. Hydraulic transportation originating from elevation variation was the most important driving force for metallic elements migration. Although damming standstill was considered as an effective strategy for controlling coarse suspended particulate pollutants, metallic elements were still transported to the Hengshi River in both dissolved phase and fine suspended particle phase accompanied by the overflow of acid mine drainage. The concentrations of dissolved metallic elements were attenuated significantly along the Hengshi River within 41 km stretch. Precipitation/ co-precipitation of iron oxyhydroxides, especially schwertmannite, ferrihydrite and goethite minerals, were established as the most critical processes for metallic elements attenuation in river...Continue Reading

Citations

Apr 15, 2019·Environmental Geochemistry and Health·Raylane Pereira GomesLilian Carla Carneiro
Sep 9, 2020·Environmental Science and Pollution Research International·Yanping BaoZhi Dang
Nov 17, 2019·Environmental Science and Pollution Research International·Da-Mao XuHan-Zhi Lin
Feb 5, 2021·Bulletin of Environmental Contamination and Toxicology·Jichang WenZhibin Duan
Apr 8, 2021·Environmental Science & Technology·Xiaoming WangMengqiang Zhu

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