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首页> 外文期刊>Journal of Hazardous Materials >Effects of microbially induced transformations and shift in bacterial community on arsenic mobility in arsenic-rich deep aquifer sediments
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Effects of microbially induced transformations and shift in bacterial community on arsenic mobility in arsenic-rich deep aquifer sediments

机译：微生物诱导的转化和细菌群落迁移对富砷深层含水层沉积物中砷迁移率的影响

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摘要

Elevated concentration of arsenic (As) prevailed in deep aquifers of Chianan Plain, Taiwan. Arsenic release in relation to microbially induced transformations and shift in bacterial communities in deep aquifer sediments of Budai, southwestern Taiwan were investigated using microcosm experiments and substrate amendments over 90 days of anaerobic incubation. The results revealed that As reduction was independent of Fe reduction and a modest rate of sedimentary As release into aqueous phase occurred at the expense of the native organic carbon. Addition of lactate resulted in a parallel increase in As(III) (3.7-fold), Fe(II) (6.2-fold) and Mn (3.5 fold) in aqueous phase compared to un-amended slurries and the enrichment of sequences related to mostly Bacillus, Flavisolibacter, and Geobacter spp, suggesting the important role of these bacteria in As enrichment through reductive dissolution of As-bearing Fe and Mn minerals. The increase in phosphate-extractable As in solid phase with concomitant rise in As in aqueous phase over the course of incubation further attested to the importance of reductive dissolution in promoting As release. Furthermore, the increase in arrA gene abundance with addition of labile carbon suggests that dissimilatory As reduction also may contribute to As enrichment in the water of the deep aquifer of Budai. (C) 2016 Elsevier B.V. All rights reserved.
机译：台湾正南平原的深层含水层中砷（As）浓度升高。利用微生物实验和厌氧培养90天后的基质改良剂，研究了砷释放与微生物诱导的转化和细菌群落在台湾西南部布岱深层含水层沉积物中的迁移有关。结果表明，As的还原与Fe的还原无关，沉积态的As向水相的释放速率适中，但以天然有机碳为代价。与未修改的浆液相比，添加乳酸会导致水相中的As（III）（3.7倍），Fe（II）（6.2倍）和Mn（3.5倍）平行增加，并且与多数是芽孢杆菌，黄杆菌和土杆菌属菌种，表明这些细菌通过还原溶解含砷的铁和锰矿物质而在富集砷中起着重要作用。在温育过程中，固相中可磷酸盐萃取的As的增加与水相中As的伴随上升进一步证明了还原溶解对促进As释放的重要性。此外，添加不稳定的碳会增加arrA基因的丰度，这表明异化As的减少也可能有助于Budai深层含水层中As的富集。 （C）2016 Elsevier B.V.保留所有权利。

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