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首页> 外文OA文献 >Enhancing As(V) adsorption and passivation using biologically formed nano-sized FeS coatings on limestone: implications for acid mine drainage treatment and neutralization
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Enhancing As(V) adsorption and passivation using biologically formed nano-sized FeS coatings on limestone: implications for acid mine drainage treatment and neutralization

机译：在石灰石上使用生物形成的纳米级FeS涂层增强As（V）的吸附和钝化：对酸性矿山排水处理和中和的意义

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摘要

The iron-reducing bacterium Acidiphilium cryputum JF-5 and a sulfate reducing bacterium (SRB) collected and purified from the mine drainage of a copper mine in the northwest of Sichuan Province, China, were used to biologically synthesize nano-sized FeS-coated limestone to remove As(V) from solution. The adsorption efficiency of As(V) is improved from 6.64 μg/g with limestone alone to 187 μg/g with the FeS coated limestone in both batch and column experiments. The hydraulic conductivity of the columns are also improved by the presence of the nano-sized FeS coatings, but the solution neutralization performance of the limestone can be reduced by passivation by gypsum and Fe(III) precipitates. Calculations for FeS-coated limestone dissolution experiments show that the process can be described as nCa.sol=At1/2-nCa,gyp. The results suggest that FeS-coated limestone may be an effective medium for remediating As(V)-bearing solutions such as acid mine drainage in systems such as Permeable Reactive Barriers.
机译：从四川西北部某铜矿的矿山排水中收集和纯化的还原铁细菌嗜酸性嗜酸性菌JF-5和硫酸盐还原细菌（SRB）用于生物合成纳米FeS包覆的石灰石从溶液中去除As（V）。在批处理和色谱柱实验中，As（V）的吸附效率从单独使用石灰石的6.64μg/ g提高到使用FeS涂层石灰石的187μg/ g。纳米级FeS涂层的存在还可以提高柱的水力传导性，但是石灰石的溶液中和性能可能会由于石膏和Fe（III）沉淀物的钝化而降低。 FeS涂层石灰石溶解实验的计算表明，该过程可以描述为nCa.sol = At1 / 2-nCa，gyp。结果表明，FeS包覆的石灰石可能是补救含As（V）溶液的有效介质，例如渗透性反应屏障等系统中的酸性矿山排水。

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