Mine waste water self-purification (arsenic) in neutral hydrogeochemical ecosystem: A case study from V-Ti-Fe mine tailings |
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| Institution: | 1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;2. Institute of Subsurface Energy Systems, Clausthal University of Technology, Clausthal Zellerfeld 38678, Germany;3. State Key Laboratory of Geohazard Prevention and Geoenvironmental Protection, Chengdu University of Technology, Chengdu 610059, China;4. Department of Petroleum & Gas Engineering, University of Engineering & Technology, 54890 Lahore, Pakistan;5. Sichuan bureau of geology & mineral resources - 402 Team, Chengdu 611743, China;1. Planetary Chemistry Laboratory, Dept. of Earth & Planetary Sciences and McDonnell Center for the Space Sciences, Washington University, St Louis, MO 63130, USA;2. Materials and Structures Division, NASA Glenn Research Center/HX5, 21000 Brookpark Road, Cleveland, OH 44135, USA;1. Fachbereich Erdsystemwissenschaften, Universität Hamburg, Grindelallee 48, D-20146 Hamburg, Germany;2. Dipartimento di Scienze, Università di Roma Tre, Largo S. Leonardo Murialdo 1, 00146 Rome, Italy;3. INFN-LNF, Via E. Fermi 40, Frascati, 00044 Rome, Italy.;4. INGV, Via di Vigna Murata 605, 00143 Rome, Italy;5. Mineralogisches Museum, Leibniz-Institut zur Analyse des Biodiversitätswandels, Grindelallee 48, D-20146 Hamburg, Germany;1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;3. Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;4. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China;5. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China;1. Department of Geology and Geography, University of North Carolina at Pembroke, 1317 Oxendine Science Building, 1 University Dr., Pembroke, NC 28372, USA;2. Department of Geosciences, Midlands State University, Private Bag, 9055, Gweru, Zimbabwe;1. Laboratório de Estudos Tectônicos (LESTE), Universidade Federal dos Vales do Jequitinhonha e Mucuri, Campus JK, MGT 367, Km 583, n° 5000 Alto da Jacuba, Diamantina, MG 39100-000, Brazil;2. Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, Bauxita, Ouro Preto, MG, 35.400-000. Brazil |
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| Abstract: | The fate of the arsenic (As) under neutral hydrogeochemical conditions in the mining ecosystem has attracted increasing concern, as the ecological restoration of As provides a possibility for safe use of mine water. However, successful cases are still inadequately reported worldwide. Therefore, to investigate the As-behavior in the mine tailings ecosystem, a study of the Wanniangou tailings pond (regional largest V-Ti-Fe mine tailings pond, Sichuan province, China) and the downstream (Rehe River) was conducted. It involves hydro-geochemistry, mineralogy, biogeochemistry, and the Geographically Weighted Regression model (GWR). The results reveal that: (1) the pH range of the mine water is 6.32 to 7.21. The chemical weathering of tailings resulted in an abnormal As concentration in water (e.g., transport pipe wastewater 76.5 μg L−1, the outlet of tailings pond 28.4 μg L−1), and it declines to the national water quality guideline (<10 μg L−1) after 2.59 km from the pond outlet. (2) Although sulfide oxidation boosts As migration in the tailings, As ecological refixation is promoted by tailings particle percolation, river sediment absorption, and aquatic plant uptake. The As refixation behaviors vary spatially, corresponding with the diversity of precipitation and absorption. Besides, Manganese (oxides or/and hydroxides) is conducive to As coprecipitation in the neutral hydrogeochemical environment. (3) The site selection of the V-Ti-Fe mine tailings pond with a downstream longer than 3 km creates a toxic metals self-restoration buffer zone, which could relieve the contamination probability and make the mining wastewater re-utilization feasible. |
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