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Microbial iron reduction enhances in-situ control of biogenic hydrogen sulfide by FeOOH granules in sediments of polluted urban waters.
Water Research ( IF 12.8 ) Pub Date : 2019-12-31 , DOI: 10.1016/j.watres.2019.115453
Jianliang Sun 1 , Li Wei 2 , Ran Yin 3 , Feng Jiang 4 , Chii Shang 5
Affiliation  

This paper discusses the abiotic and biotic processes in the in-situ control of biogenic hydrogen sulfide generated from microbial sulfate reduction by ferric (FeIII) (hydr)oxides (FeOOH) granules in the sediments of polluted urban waters. Granular ferric hydroxide (GFH, β-FeOOH) and granular ferric oxide (GFO, α-FeOOH) dosed in the organic- and sulfate-rich sediments had 180% and 19% higher sulfide removal capacities than those used for the purely abiotic removal of dissolved sulfide, respectively. The enhancement was attributable to the involvement of the biotic pathways, besides the abiotic pathways (mainly sulfide oxidation). The FeOOH granules stimulated the microbial reduction of surface FeIII by iron-reducing bacteria (e.g., Desulfovibrio and Carnobacterium), and increased the microbial sulfate reduction by 24%-30% under an organic-rich condition, likely due to the enhanced organic fermentation. The microbial iron reduction significantly enhanced the removal of the formed biogenic hydrogen sulfide through increasing sulfide precipitation because it remarkably promoted the release of Fe2+ ions from the granule surface, likely due to the involvement of siderophores as ligands. This biotic pathway led to the formation of amorphous FeS(s) as a major sulfur product (56%-81%), instead of elemental sulfur. The enhancement in the sulfide control performance was much more pronounced when the poorly ordered GFH was used, because of the faster Fe2+ release, compared to the highly ordered GFO. The abiotic and biotic mechanisms elucidated in this study provide insights into the iron-sulfur chemistry in the sediments of various polluted waters (e.g., storm drains, urban rivers, and estuary), where the manually-dosed and naturally-occurring FeIII (hydr)oxides control biogenic hydrogen sulfide.

中文翻译:

微生物中铁的还原增强了FeOOH颗粒在污染的城市水域沉积物中对生物硫化氢的原位控制。

本文讨论了就地控制生物污染的生物过程中的非生物和生物过程,该过程是由污染的城市水域沉积物中的三价铁(FeIII)(氢)氧化物(FeOOH)颗粒还原微生物硫酸盐而产生的。富含有机和硫酸盐的沉积物中加入的颗粒状氢氧化铁(GFH,β-FeOOH)和颗粒状三氧化二铁(GFO,α-FeO​​OH)的硫化物去除能力比纯非生物去除高出180%和19%。溶解的硫化物。除非生物途径(主要是硫化物氧化)外,增强还归因于生物途径的参与。FeOOH颗粒通过还原铁细菌(例如,脱硫弧菌和食肉杆菌)刺激表面FeIII的微生物还原,并且在富含有机物的条件下,微生物硫酸盐的减少量增加了24%-30%,这可能是由于有机发酵的增强所致。微生物中铁的还原通过增加硫化物的沉淀显着提高了生成的生物硫化氢的去除,因为它显着地促进了Fe2 +离子从颗粒表面的释放,这可能是由于铁载体作为配体的缘故。这种生物途径导致非晶态FeS的形成,成为主要的硫产物(56%-81%),而不是元素硫。当使用有序的GFH时,由于与高有序的GFO相比,Fe2 +释放更快,因此硫化物控制性能的增强要明显得多。
更新日期:2019-12-31
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