Denitrification characteristics and pathways of a facultative anaerobic denitrifying strain, Pseudomonas denitrificans G1

文献类型： 外文期刊

第一作者： Chen, Zhao

作者： Chen, Zhao;Chang, Zhiqiang;Wang, Jiajia;Li, Jian;Jiang, Yuli;Song, Xiefa;Huang, Zhitao;Chen, Shibo

作者机构：

关键词： Aerobic denitrification; Anaerobic denitrification; Nitrogen removal; Pseudomonas denitrificans; Denitrification mechanism

期刊名称：JOURNAL OF BIOSCIENCE AND BIOENGINEERING （ 影响因子：2.894； 五年影响因子：2.746 ）

ISSN： 1389-1723

年卷期： 2020 年 129 卷 6 期

页码：

收录情况： SCI

摘要： Excessive nitrate in aquaculture systems has attracted wide attention. To isolate novel aerobic denitrifying strain and characterize its nitrogen removal processes, a facultative anaerobic denitrification bacterium, identified as Pseudomonas denitrificans G1, was isolated from marine sediments. Strain G1 could grow and remove 90-98% of nitrate and 97-99% of nitrite under an aerobic or anaerobic condition in 24 h, with the total nitrogen removal rate of 33-38% (87-100 mg/L). The highest denitrification rate could reach 15.1 mg/(L$h). The suitable condition for the denitrification of G1 is C/N ratio 5-22, dissolved oxygen 0e4.68 mg/L, salinity 0-30 g NaCl/L, pH 7-9.5. Under the aerobic condition, G1 grew fast; however, the mass spectrographic analysis showed that the gas product was N2O. Under the anaerobic conditions, G1 grow relatively slowly, but could also achieve effective denitrification and the final product was N-2. In denitrification of aquaculture wastewater, strain G1 can remove 60.57% of nitrate and 36.36% of total nitrogen; meanwhile, there was a slight accumulation of ammonia nitrogen. P. denitrificans strain G1 has potential in denitrification processes for the treatment of aquaculture wastewater. However, the regulation of reaction conditions and gas products needs to be further studied. (C) 2019, The Society for Biotechnology, Japan. All rights reserved.

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