Nitrate removal during Fe(III) bio-reduction in microbial-mediated iron redox cycling systems
Nitrate removal during Fe(III) bio-reduction in microbial-mediated iron redox cycling systems
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微生物介导的铁氧化还原循环系统中 Fe(III) 生物还原过程中硝酸盐的去除
DOI：
10.2166/wst.2021.280
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发表时间：
2021-07
影响因子：
2.7
通讯作者：
Xueping Chen
中科院分区：
文献类型：
--
作者：
Yongsheng Lu;Hui Liu;Xueer Huang;Lu Xu;Jizhi Zhou;Guangren Qian;Jupei Shen;Xueping Chen
摘要。铁（III）生物还原为铁氧化还原循环在水生环境硝酸盐修复中的应用提供了前景。本研究的目的是在含有希瓦氏菌MR-1 （S. oneidensis MR-1）和水合铁或磁铁矿的系统中实现硝酸盐的多重去除。结果表明：在添加30 mg·L−1 NO3−-N的3个周期内，硝酸盐的全部还原在170 h内完成。在第1个周期（0 ~ 30 h），硝酸盐的去除主要是由于S. oneidensis MR-1的生物还原过程，同时伴有Fe（III）的还原。在第二期（45 ~ 90 h）和第三期（100 ~ 170 h）硝酸盐添加过程中，生物源性Fe（II）氧化与硝酸盐还原同时发生。该氧化还原反应使水合铁/S的气态氮产出率分别为47.33%和16.8%。一种是MR-1和磁铁矿/S。分别为MR-1系统。此外，亚硝酸盐作为中间产物，在第三次添加硝酸盐后积累并对硝酸盐的去除产生负面影响。通过对比生物还原前后铁矿物的x射线衍射图，发现水合铁转变为磁铁矿，而磁铁矿则保持原有的晶体形态。
Abstract. Fe(III) bio-reduction provides a prospect of applying the iron redox cycle to nitrate remediation in the aquatic environment. The objective of this study was to realize multiple nitrate removals in the system containing Shewanella oneidensis MR-1 (S. oneidensis MR-1) and ferrihydrite or magnetite. The results showed that with three periods of 30 mg·L−1 NO3−-N addition, all nitrate reduction was completed within 170 h. In the first period (0–30 h) of nitrate addition, the main contribution of nitrate removal was due to the biological reduction process by S. oneidensis MR-1, accompanied by the reduction of Fe(III). During the second (45–90 h) and third periods (100–170 h) of nitrate addition, oxidation of biogenic Fe(II) coupled with the reduction of nitrate took place. This redox reaction resulted in the production of gaseous nitrogen of 47.33% and 16.8% for ferrihydrite/S. oneidensis MR-1 and magnetite/S. oneidensis MR-1 systems, respectively. In addition, nitrite, as an intermediate product, accumulated and negatively affected nitrate removal after the third addition of nitrate. By comparing the patterns of X-ray diffraction of the iron minerals before and after the bio-reduction, it was found that ferrihydrite was transformed into magnetite, while magnetite kept its original crystal form.
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影响因子：
1.5
作者：
P. Simpson;D. Richardson;R. Codd
通讯作者：
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DOI：
10.1038/ismej.2014.201
发表时间：
2014-10
期刊：
The ISME Journal
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影响因子：
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作者：
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影响因子：
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