Microbial mediated iron redox cycling in Fe (hydr)oxides for nitrite removal

被引：40

作者：

Lu, Yongsheng ^{[1
]}

Xu, Lu ^{[1
]}

Shu, Weikang ^{[1
]}

Zhou, Jizhi ^{[1
]}

Chen, Xueping ^{[1
]}

Xu, Yunfeng ^{[1
]}

Qian, Guangren ^{[1
]}

机构：

[1] Shanghai Univ, Sch Environm & Chem Engn, 99 Shangda Rd, Shanghai 200444, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2017年 / 224卷

关键词：

Nitrite removal; Iron (hydr)oxide; Microbial reduction; Redox cycling; ZERO-VALENT IRON; NITRATE REMOVAL; AQUEOUS-SOLUTION; WASTE-WATER; REDUCTION; BACTERIA; FE(III); NONTRONITE; MAGNETITE; SEDIMENTS;

D O I：

10.1016/j.biortech.2016.10.025

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Nitrite, at an environmentally relevant concentration, was significantly reduced with iron (hydr) oxides mediated by Shewanella oneidensis MR-1. The average nitrite removal rates of 1.28 +/- 0.08 and 0.65 +/- 0.02 (mg L-1) h(1) were achieved with ferrihydrite and magnetite, respectively. The results showed that nitrite removal was able to undergo multiple redox cycles with iron (hydr) oxides mediated by Shewanella oneidensis MR-1. During the bioreduction of the following cycles, biogenic Fe(II) was subsequently chemically oxidized to Fe(III), which is associated with nitrite reduction. There was 11.18 +/- 1.26 mg L-1 of NH4+-N generated in the process of redox cycling of ferrihydrite. Additionally, results obtained by using X-ray diffraction showed that ferrihydrite and magnetite remained mainly stable in the system. This study indicated that redox cycling of Fe in iron (hydr) oxides was a potential process associated with NO2-N removal from solution, and reduced most nitrite abiotically to gaseous nitrogen species. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：34 / 40

页数：7

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