Nitrate removal during Fe(III) bio-reduction in microbial-mediated iron redox cycling systems

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. T...

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Autores principales:	Yongsheng Lu, Hui Liu, Xueer Huang, Lu Xu, Jizhi Zhou, Guangren Qian, Jupei Shen, Xueping Chen
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	biogenic fe(ii) denitrification gaseous nitrogen iron minerals iron-reducing bacteria Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/8b05aa4691f64090a30a918055dd3e47
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spelling	oai:doaj.org-article:8b05aa4691f64090a30a918055dd3e472021-11-06T11:18:31ZNitrate removal during Fe(III) bio-reduction in microbial-mediated iron redox cycling systems0273-12231996-973210.2166/wst.2021.280https://doaj.org/article/8b05aa4691f64090a30a918055dd3e472021-08-01T00:00:00Zhttp://wst.iwaponline.com/content/84/4/985https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Fe(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. HIGHLIGHTS Low-concentration nitrate did not inhibit the bio-reduction of Fe(III).; Nitrate was removed continuously in a microbial Fe redox cycle.; Abiotic reduction with biogenic Fe(II) was the sole process to remove TN.; Nitrite accumulated might have a negative effect on nitrate removal.;Yongsheng LuHui LiuXueer HuangLu XuJizhi ZhouGuangren QianJupei ShenXueping ChenIWA Publishingarticlebiogenic fe(ii)denitrificationgaseous nitrogeniron mineralsiron-reducing bacteriaEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 4, Pp 985-994 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	biogenic fe(ii) denitrification gaseous nitrogen iron minerals iron-reducing bacteria Environmental technology. Sanitary engineering TD1-1066
spellingShingle	biogenic fe(ii) denitrification gaseous nitrogen iron minerals iron-reducing bacteria Environmental technology. Sanitary engineering TD1-1066 Yongsheng Lu Hui Liu Xueer Huang Lu Xu Jizhi Zhou Guangren Qian Jupei Shen Xueping Chen Nitrate removal during Fe(III) bio-reduction in microbial-mediated iron redox cycling systems
description	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. HIGHLIGHTS Low-concentration nitrate did not inhibit the bio-reduction of Fe(III).; Nitrate was removed continuously in a microbial Fe redox cycle.; Abiotic reduction with biogenic Fe(II) was the sole process to remove TN.; Nitrite accumulated might have a negative effect on nitrate removal.;
format	article
author	Yongsheng Lu Hui Liu Xueer Huang Lu Xu Jizhi Zhou Guangren Qian Jupei Shen Xueping Chen
author_facet	Yongsheng Lu Hui Liu Xueer Huang Lu Xu Jizhi Zhou Guangren Qian Jupei Shen Xueping Chen
author_sort	Yongsheng Lu
title	Nitrate removal during Fe(III) bio-reduction in microbial-mediated iron redox cycling systems
title_short	Nitrate removal during Fe(III) bio-reduction in microbial-mediated iron redox cycling systems
title_full	Nitrate removal during Fe(III) bio-reduction in microbial-mediated iron redox cycling systems
title_fullStr	Nitrate removal during Fe(III) bio-reduction in microbial-mediated iron redox cycling systems
title_full_unstemmed	Nitrate removal during Fe(III) bio-reduction in microbial-mediated iron redox cycling systems
title_sort	nitrate removal during fe(iii) bio-reduction in microbial-mediated iron redox cycling systems
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/8b05aa4691f64090a30a918055dd3e47
work_keys_str_mv	AT yongshenglu nitrateremovalduringfeiiibioreductioninmicrobialmediatedironredoxcyclingsystems AT huiliu nitrateremovalduringfeiiibioreductioninmicrobialmediatedironredoxcyclingsystems AT xueerhuang nitrateremovalduringfeiiibioreductioninmicrobialmediatedironredoxcyclingsystems AT luxu nitrateremovalduringfeiiibioreductioninmicrobialmediatedironredoxcyclingsystems AT jizhizhou nitrateremovalduringfeiiibioreductioninmicrobialmediatedironredoxcyclingsystems AT guangrenqian nitrateremovalduringfeiiibioreductioninmicrobialmediatedironredoxcyclingsystems AT jupeishen nitrateremovalduringfeiiibioreductioninmicrobialmediatedironredoxcyclingsystems AT xuepingchen nitrateremovalduringfeiiibioreductioninmicrobialmediatedironredoxcyclingsystems
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Nitrate removal during Fe(III) bio-reduction in microbial-mediated iron redox cycling systems

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