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首页> 外文期刊>Environmental Science & Technology >Removal of Arsenic from Contaminated Soils by Microbial Reduction of Arsenate and Quinone
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Removal of Arsenic from Contaminated Soils by Microbial Reduction of Arsenate and Quinone

机译：通过微生物还原砷酸盐和醌去除污染土壤中的砷

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We investigated bioremediation of As-contaminated soils by reductive dissolution of As using a dissimilatory As(V)-reducing bacterium (DARB), Bacillus selenatarsenatis SF-1. We also examined the effect of anthraquinone-2,6-disulfonate (AQDS), an extracellular electron-shuttling quinone, on the As extraction. When B. selenatarsenatis was incubated with As(V)-laden Al precipitates, no acceleration of As dissolution was observed in the presence of AQDS, even though the microbial reduction of AQDS occurred actively. In contrast, AQDS addition significantly enhanced the reductive dissolution of As and Fe in analogous experiments with As(V)-laden Fe(III) precipitates, whereas As dissolution did not occur in the absence of the As(V) reducer. These results indicate the dissolution of As was accelerated by indirect reduction of solid-phase Fe(III) following microbial AQDS reduction, although As(V) reduction is vital for As extraction. B. selenatarsenatis was able to extract As from two types of industrially contaminated soils through reduction of solid-phase As(V) and Fe(III).The copresence of AQDS with B. selenatarsenatis improved the removal efficiency of As from the contaminated soils, concomitantly releasing Fe(II), suggesting that simultaneous use of DARB and electron-shuttling compounds can be an effective strategy for remediation of As-contaminated soils.
机译：我们通过使用异化As（V）还原细菌（DARB），硒化芽孢杆菌SF-1还原还原As来研究As污染土壤的生物修复。我们还研究了2,6-蒽磺酸蒽醌（AQDS）（一种细胞外电子节制醌）对As提取的影响。当硒枯草芽孢杆菌与载有As（V）的Al沉淀物一起孵育时，即使AQDS的微生物活性降低，在AQDS存在下也未观察到As的加速溶解。相反，在类似的实验中，添加AQDS的Fe（III）沉淀物显着提高了As和Fe的还原溶解度，而在没有As（V）还原剂的情况下，As溶解没有发生。这些结果表明，通过微生物AQDS还原后，固相Fe（III）的间接还原促进了As的溶解，尽管As（V）的还原对于As的提取至关重要。通过减少固相中的As（V）和Fe（III）的存在，B。selenatarsenatis能够从两种工业污染土壤中提取As.AQDS与B. selenatarsenatis的共存提高了被污染土壤中As的去除效率，同时释放Fe（II），表明同时使用DARB和电子穿梭化合物可能是修复被As污染土壤的有效策略。

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