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Hydrophilic sulfurized nanoscale zero-valent iron for enhancing in situ biocatalytic denitrification: Mechanisms and long-term column studies
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2023-03-12 , DOI: 10.1016/j.jhazmat.2023.131197
So Yeon Yoon 1 , Min Ji Kim 2 , Hye Won Kim 2 , Seon Hwa Lim 2 , Choe Earn Choong 1 , Sang-Eun Oh 3 , Jung Rae Kim 4 , Yeomin Yoon 5 , Jae Young Choi 6 , Eun Ha Choi 7 , Min Jang 1
Affiliation  

The aim of this study was to investigate the effects of hydrophilic sulfur-modified nanoscale zero-valent iron (S-nZVI) as a biocatalyst for denitrification. We found that the denitrifying bacteria Cupriavidus necator (C. necator) promoted Fe corrosion during biocatalytic denitrification, reducing surface passivation and sulfur species leaching from S-nZVI. As a result, S-nZVI exhibited a higher synergistic factor (fsyn = 2.43) for biocatalytic NO3- removal than nanoscale zero-valent iron (nZVI, fsyn = 0.65) at an initial nitrate concentration of 25 mg L−1-N. Based on kinetic profiles, SO42- was the preferred electron acceptor over NO3- when using C. necator and S-nZVI for biocatalytic denitrification. Up-flow column experiments demonstrated that biocatalytic denitrification using S-nZVI achieved a total nitrogen removal capacity of up to 2004 mg L−1 for 127 d. Notably, microbiome taxonomic profiling showed that the addition of S-nZVI to the groundwater promoted the growth of Geobacter, Desulfosporosinus, Streptomyces, and Simplicispira spp in the column experiments. Most of those microbes can reduce sulfate, promote denitrification, and match the batch kinetic profile obtained using C. necator. Our results not only discover the great potential of S-nZVI as a biocatalyst for enhancing denitrification via microbial activation but also provide a deep understanding of the complicated abiotic-biotic interaction.



中文翻译:

用于增强原位生物催化反硝化作用的亲水硫化纳米级零价铁:机制和长期柱研究

本研究的目的是研究亲水性硫改性纳米级零价铁 (S-nZVI) 作为反硝化生物催化剂的效果。我们发现反硝化细菌Cupriavidus necator ( C. necator ) 在生物催化反硝化过程中促进了 Fe 腐蚀,减少了 S-nZVI 的表面钝化和硫物质浸出。因此,在初始硝酸盐浓度为 25 mg L −1 -时,S-nZVI 表现出比纳米级零价铁(nZVI,f syn = 0.65)更高的生物催化 NO 3 去除协同因子(f syn = 2.43 ) - N. 基于动力学曲线,SO 4 2-是优于 NO 3的首选电子受体-当使用C. necator和 S-nZVI 进行生物催化反硝化时。上流柱实验表明,使用 S-nZVI 的生物催化反硝化在 127 天的时间内实现了高达 2004 mg L -1的总脱氮能力。值得注意的是,微生物组分类学分析表明,在柱实验中,向地下水中添加 S-nZVI 促进了GeobacterDesulfosporosinusStreptomycesSimplicispira spp 的生长。这些微生物中的大多数可以还原硫酸盐,促进反硝化作用,并与使用C. necator获得的批次动力学曲线相匹配. 我们的研究结果不仅发现了 S-nZVI 作为生物催化剂通过微生物活化增强反硝化作用的巨大潜力,而且还提供了对复杂的非生物-生物相互作用的深刻理解。

更新日期:2023-03-12
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