Denitrification potential evaluation of a newly indigenous aerobic denitrifier isolated from largemouth bass Micropterus salmoides culture pond

文献类型： 外文期刊

第一作者： Wang Cuicui

作者： Wang Cuicui;Zhang Kai;Xie Jun;Yu Deguang;Wang Guangjun;Yu Ermeng;Gong Wangbao;Li Zhifei;Wang Cuicui;Liu Qigen

作者机构：

关键词： aerobic denitrification; ammonium removal; Micropterus salmoides; Pseudomonas CW-2

期刊名称：JOURNAL OF OCEANOLOGY AND LIMNOLOGY （ 影响因子：1.265； 五年影响因子：1.276 ）

ISSN： 2096-5508

年卷期： 2018 年 36 卷 3 期

页码：

收录情况： SCI

摘要： This work evaluates the application potential of a new indigenous aerobic denitrifier, strain Pseudomonas CW-2, isolated from a largemouth bass culture pond. The rate of ammonium-N removal by strain CW-2 was approximately 97% at a DO concentration of 5.2 mg/L. Furthermore, when nitrate and ammonia coexisted, the strain gave priority to assimilating ammonia, and thereafter to denitrification. Under optimal cultivation conditions, citrate and acetate were the carbon resources, C/N was 8, dissolved oxygen was 5.2 mg/L, and pH was 7; the removal rate of ammonium reached nearly 90%. The changing patterns of different bacteria in strain CW-2-treated and the control pond water were also compared. Lower levels of ammonia, nitrite, and phosphates were observed in the treated water as compared with the controls. Meanwhile, phylum-level distributions of the bacterial OTUs revealed that Proteobacteria, Bacteroidetes, Planctomycetes, and Nitrospirae continuously changed their relative abundances in relation to carbon and the addition of strain CW-2; this finding implies that the conventional denitrification process was weakened under the effects of carbon or the presence of strain CW-2. We propose that strain CW-2 is a promising organism for the removal of ammonium in intensive fish culture systems, according to our evaluations of its denitrification performance.

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