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Removal of Molybdenum from Mining-Impacted Water by Sorption onto Manganese-Rich Sludge

Eliminación del molibdeno del agua impactada por la minería mediante la sorción en lodos ricos en manganeso

Abstract

Molybdenum (Mo) concentrations in mining-impacted water can be orders of magnitude higher than health-based values for drinking water. Mo in oxidized mine waters is predominantly present as the oxyanion molybdate, which is problematic in mine water treatment because it is not removed by conventional alkaline addition treatment and requires separate Mo-specific methods. Mo removal by sorption to ferric precipitates is the typical treatment strategy. We investigated a sustainable alternative for a mine water with low-iron content and high manganese (Mn). We evaluate the potential for Mo removal by sorption onto Mn-rich sludge from a mine water treatment plant that uses lime to remove metals at pH 10. In laboratory sorption batch tests with an initial Mo concentration of 10 mg/L in a sodium chloride solution, over 90% of the Mo was removed onto the sludge at pH 6 and below (up to 34 mg Mo/g Mn). Sorption was sensitive to pH, with sharp decreases in sorption levels from pH 6 to 8. Sorption was also affected by the matrix composition of the mine water samples, apparently due to competitive sorption from other ions in the mine water. Use of site Mn for water treatment provides a more sustainable treatment approach; however, additional knowledge is required to understand the effects of site-specific complexities.

Resumen

Las concentraciones de molibdeno (Mo) en las aguas afectadas por la minería pueden ser algunos órdenes de magnitud superiores a los valores sanitarios para el agua potable. El Mo en las aguas mineras oxidadas está presente predominantemente como el oxianión molibdato, que presenta complicaciones durante el tratamiento del agua minera porque no se elimina con el tratamiento convencional de adición alcalina y requiere métodos separados específicos para el Mo. La eliminación de Mo mediante sorción en precipitados férricos es la estrategia de tratamiento típica. Investigamos una alternativa sostenible para un agua de mina con bajo contenido en hierro y alto en manganeso (Mn). Evaluamos el potencial de eliminación de Mo por sorción en lodos ricos en Mn procedentes de una planta de tratamiento de aguas de mina que utiliza cal para eliminar metales a pH 10. En pruebas de sorción en laboratorio con una concentración inicial de Mo de 10 mg/L en una solución de cloruro de sodio, más del 90% del Mo se eliminó en el lodo a pH 6 y por debajo (hasta 34 mg Mo/g Mn). La sorción fue sensible al pH, con fuertes descensos en los niveles de sorción desde el pH 6 al 8. La sorción también se vio afectada por la composición de la matriz de las muestras de agua de la mina, aparentemente debido a la sorción competitiva de otros iones en el agua de la mina. El uso del Mn del emplazamiento para el tratamiento del agua proporciona un enfoque de tratamiento más sostenible; sin embargo, se requieren conocimientos adicionales para comprender los efectos de las complejidades específicas del emplazamiento.

含锰污泥吸附去除受采矿影响废水中钼的方法

受采矿影响水体的钼(Mo)浓度可能比饮用水健康标准高几个数量级.钼在氧化环境的矿井水中主要以钼酸盐阴离子的形式存在, 不能为常规的加碱水处理方法所去除,还需再用特定的钼去除方法分开处理,给矿井水处理带来了困难.用铁沉淀物吸附处理是去除钼的典型方案.研究用低铁和高锰的可持续替代物来处理矿井水.评价了矿井水处理厂含锰污泥的钼(Mo)吸附去除潜力, 水处理厂在pH = 10的条件下用石灰去除污水金属.在实验室吸附批处理试验中,氯化钠溶液的钼(Mo)初始浓度10 mg/L,pH值小于6,超过90%的Mo被污泥吸附去除 (达34 mg Mo/g Mn).吸附对pH值很敏感,pH值从 6到8时,吸附水平也急剧下降.吸附还受矿井水样品的基本成分影响, 显然是因矿井水中其它离子具有竞争吸附作用.利用现场含锰产物进行水处理是—种更可持续的处理方法;然而,还需要更多地了解现场复杂性的影响.

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Acknowledgements

The authors thank the mine staff for providing sludge and water samples for use in this research.

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Correspondence to Sarah Doyle.

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Doyle, S., Figueroa, L. Removal of Molybdenum from Mining-Impacted Water by Sorption onto Manganese-Rich Sludge. Mine Water Environ 41, 721–730 (2022). https://doi.org/10.1007/s10230-022-00893-4

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  • DOI: https://doi.org/10.1007/s10230-022-00893-4

Keywords

  • Molybdate
  • Adsorption
  • Mine water treatment
  • Manganese hydroxide
  • Manganese oxide