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首页> 外文期刊>Environmental Science & Technology >Reduction of Nitroaromatic Compounds Coupled to Microbial Iron Reduction in Laboratory Aquifer Columns
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Reduction of Nitroaromatic Compounds Coupled to Microbial Iron Reduction in Laboratory Aquifer Columns

机译：实验室含水层柱中硝基芳族化合物的还原与微生物铁的还原

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Using 10 monosubstituted nitrobenzenes as model compounds, the interdependence between the reduction of organic pollutants and microbial iron reduction in anaerobic aquifers has been studied in laboratory column systems. All nitroaromatic compounds (NACs) investigated were stoichiometrically reduced to the corresponding amino compounds. It is proposed that NAC reduction occurred primarily by a reaction with surface-bound iron species, which served as mediators for the transfer of electrons originating from microbial oxidation of organic material by iron-reducing bacteria. Although the different NACs studied exhibited very different one-electron reduction potentials, they were reduced at very similar rates under all conditions investigated, indicating that the regeneration of reactive sites and not the electron transfer to the NAC was the rate-limiting process. It is also proposed that the presence of reducible organic pollutants such as NACs may significantly enhance the activity of iron-reducing bacteria in aquifers, in that reduction of such compounds continuously regenerates easily available Fe(III) species.
机译：使用10个单取代的硝基苯作为模型化合物，在实验室色谱柱系统中研究了厌氧含水层中有机污染物的减少与微生物铁的减少之间的相互依赖性。将所有研究的硝基芳族化合物（NAC）化学计量还原为相应的氨基化合物。有人提出，NAC还原主要是通过与表面结合的铁物质发生反应而发生的，该物质与铁还原细菌作为有机介质微生物氧化产生的电子的传递介质。尽管研究的不同NAC表现出非常不同的单电子还原电位，但它们在所有研究条件下均以非常相似的速率还原，这表明反应位点的再生而不是电子转移至NAC是限速过程。还提出，诸如NAC之类的可还原有机污染物的存在可以显着增强含水层中还原铁细菌的活性，因为此类化合物的还原连续地再生了容易获得的Fe（III）物质。

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