Mobility and natural attenuation of metals and arsenic in acidic waters of the drainage system of Timok River from Bor copper mines (Serbia) to Danube River
| Autor: | Daizo Ishiyama, Yasumasa Ogawa, Stefan Đorđievski, Zoran Stevanović |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Iron
Health Toxicology and Mutagenesis chemistry.chemical_element Fresh Water Sulfides 010501 environmental sciences engineering.material 010502 geochemistry & geophysics 01 natural sciences Mining Arsenic chemistry.chemical_compound Rivers Metals Heavy Tributary Environmental Chemistry 0105 earth and related environmental sciences Calcite geography geography.geographical_feature_category Bedrock General Medicine Acid mine drainage Pollution Tailings chemistry Wastewater Metals Environmental chemistry Metallurgy engineering Environmental science Pyrite Serbia Copper Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Environmental Science and Pollution Research. 25:25005-25019 |
| ISSN: | 1614-7499 0944-1344 |
| DOI: | 10.1007/s11356-018-2541-x |
| Popis: | Bor, Krivelj, and Bela Rivers belong to the watershed of Timok River, which is a tributary of transboundary Danube River. These rivers receive metal-rich acidic wastewater from metallurgical facilities and acid mine drainage (AMD) from mine wastes around Bor copper mines. The aim of this study was to determine the mobility and natural attenuation of metals and arsenic in rivers from Bor copper mines to Danube River during the year 2015. The results showed that metallurgical facilities had the largest impact on Bor River by discharging about 400 t of Cu per year through highly acidic wastewater (pH = 2.6). The highest measured concentrations of Cu in river water and sediments were 40 mg L−1 and 1.6%, respectively. Dissolution of calcite from limestone bedrock and a high concentration of bicarbonate ions in natural river water (about 250 mg L−1) enhanced the neutralization of acidic river water and subsequent chemical precipitation of metals and arsenic. Decreases in the concentrations of Al, Fe, Cu, As, and Pb in river water were mainly due to precipitation on the river bed. On the other hand, dilution played an important role in the decreases in concentrations of Mn, Ni, Zn, and Cd. Chemically precipitated materials and flotation tailings containing Fe-rich minerals (fayalite, magnetite, and pyrite) were transported toward Danube River during the periods of high discharge. This study showed that processes of natural attenuation in catchments with limestone bedrock play an important role in reducing concentrations of metals and arsenic in AMD-bearing river water. |
| Databáze: | OpenAIRE |
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