N2O and N2 production during heterotrophic nitrification by Alcaligenes faecalis strain NR

被引：164

作者：

Zhao, Bin ^{[1
]}

An, Qiang ^{[1
]}

He, Yi Liang ^{[2
]}

Guo, Jin Song ^{[1
]}

机构：

[1] Chongqing Univ, Key Lab Ecoenvironm Three Gorges Reservoir Reg, Chongqing 400045, Peoples R China

[2] Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, Shanghai 200240, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2012年 / 116卷

基金：

中国国家自然科学基金;

关键词：

Heterotrophic nitrification; Biologic nitrogen removal; Enzyme activity; Hydroxylamine oxidase; Alcaligenes faecalis; AEROBIC DENITRIFICATION; THIOSPHAERA-PANTOTROPHA; NITRITE REDUCTASE; BACTERIUM; OXIDATION; REMOVAL; STEP;

D O I：

10.1016/j.biortech.2012.03.113

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

A heterotrophic nitrifier, strain NR, was isolated from a membrane bioreactor. Strain NR was identified as Alcaligenes faecalis by Auto-Microbic system and16S rRNA gene sequence analysis. A. faecalis strain NR shows a capability of heterotrophic nitrification and N2O and N-2 production as well under the aerobic condition. Further tests demonstrated that neither nitrite nor nitrate could be denitrified aerobically by strain NR. However, when hydroxylamine was used as the sole nitrogen source, nitrogenous gases were detected. With an enzyme assay, a 0.063 U activity of hydroxylamine oxidase was observed, while nitrate reductase and nitrite reductase were undetectable. Thus, nitrogenous gas was speculated to be produced via hydroxylamine. Therefore, two different metabolic pathways might exist in A. faecalis NR. One is heterotrophic nitrification by oxidizing ammonium to nitrite and nitrate. The other is oxidizing ammonium to nitrogenous gas directly via hydroxylamine. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：379 / 385

页数：7

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