The Nitrogen Removal Characteristics of a Novel Salt-Tolerant Bacterium, Enterobacter quasihormaechei DGFC5, Isolated from Municipal Sludge

文献类型： 外文期刊

第一作者： Wang, Bingguo

作者： Wang, Bingguo;Liu, Wei;Wang, Bingguo;Liu, Wei;Peng, Huanlong

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关键词： heterotrophic nitrification-aerobic denitrification; salt-tolerant; nitrogen metabolism pathway; environmental factors

期刊名称：MICROORGANISMS （ 影响因子：4.2； 五年影响因子：4.6 ）

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年卷期： 2024 年 12 卷 12 期

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收录情况： SCI

摘要： A novel bacterial strain, Enterobacter quasihormaechei DGFC5, was isolated from a municipal sewage disposal system. It efficiently removed ammonium, nitrate, and nitrite under conditions of 5% salinity, without intermediate accumulation. Provided with a mixed nitrogen source, DGFC5 showed a higher utilization priority for NH4+-N. Whole-genome sequencing and nitrogen balance experiments revealed that DGFC5 can simultaneously consume NH4+-N in the liquid phase through assimilation and heterotrophic nitrification, and effectively remove nitrate via aerobic denitrification and dissimilatory reduction reactions. Single-factor experiments were conducted to determine the optimal nitrogen removal conditions, which were as follows: a carbon-to-nitrogen ratio of 15, a shaking speed of 200 rpm, a pH of 7, C4H4Na2O4 as the carbon source, and a temperature of 30 degrees C. DGFC5 showed efficient nitrogen purification capabilities under a wide range of environmental conditions, indicating its potential for disposing of nitrogenous wastewater with high salinity.

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