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

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Journal of Oceanology and Limnology 2018年第3期36卷 913-925页

作者： WANG Cuicui ZHANG Kai XIE Jun LIU Qigen YU Deguang WANG auangjun YU Ermeng GONG Wangbao LI Zhifei Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation Ministry of AgriculturePearl River Fisheries Research InstituteChinese Academy of Fishery SciencesGuangzhou 510380China College of Fisheries and Life Sciences Shanghai Ocean UniversityShanghai 201306China

This work evaluates the application potential of a new indigenous aerobic denitrifi er, 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 denitrifi cation. 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 P roteobacteria, Bacteroidetes, Planctomycetes, and N itrospirae continuously changed their relative abundances in relation to carbon and the addition of strain cw-2; this finding implies that the conventional denitrifi cation process was weakened under the ef fects 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 denitrifi cation performance.

关键词： aerobic denitrification ammonium removal Micropterus salmoides pseudomonas cw-2

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