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Potential for water and metal recovery from acid mine drainage by combining hybrid membrane processes with selective metal precipitation
Resources, Conservation and Recycling ( IF 13.2 ) Pub Date : 2022-09-08 , DOI: 10.1016/j.resconrec.2022.106629
Elena León-Venegas, Luis F. Vilches-Arenas, Custodia Fernández-Baco, Fátima Arroyo-Torralvo

Acid mining drainage has a serious impact on the environment. Forward osmosis allows the concentration of acid mine waters to favor the formation of enrichment sludges and subsequent selective metal precipitation. In this work, a methodology was proposed to treat mining effluents from the Iberian Pyrite Belt. Forward osmosis experiments were performed using different osmotic pressures from 0.5M to 2.5M NaCl to evaluate water fluxes and recovery. The water recovery obtained was in the range of 50-80%, and the flux remained above 5 (L•m−2•h−1). Four combined processes were modelled to determine the feasibility of eliminating water and precipitating metals. Furthermore, a new hybrid membrane process was proposed to recover at least 75% of water with recovery yields of Al, Fe, Cu, Zn and Mn of greater than 70%. A water production cost of 2.01 $/m3 and a specific energy consumption of 8.03 kWhe/m3 were estimated for the hybrid process.



中文翻译:

通过将混合膜工艺与选择性金属沉淀相结合,从酸性矿山排水中回收水和金属的潜力

酸性矿山排水对环境造成严重影响。正向渗透允许酸性矿井水的浓缩有利于富集污泥的形成和随后的选择性金属沉淀。在这项工作中,提出了一种处理伊比利亚黄铁矿带采矿废水的方法。使用从 0.5M 到 2.5M NaCl 的不同渗透压进行正向渗透实验,以评估水通量和回收率。获得的水回收率在 50-80% 范围内,通量保持在 5 (L•m -2 •h -1)。对四个组合过程进行了建模,以确定消除水和沉淀金属的可行性。此外,提出了一种新的混合膜工艺,以回收至少 75% 的水,铝、铁、铜、锌和锰的回收率大于 70%。估计混合工艺的水生产成本为 2.01 美元/m 3,单位能耗为 8.03 kWh e /m 3 。

更新日期:2022-09-09
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