Nitrogen removal by a metal‐resistant bacterium, Pseudomonas putida ZN1, capable of heterotrophic nitrification–aerobic denitrification

2018 ◽  
Author(s):  
Ni Zhang ◽  
Hu Chen ◽  
Yongkang Lyu ◽  
Ying Wang
Keyword(s):  
Pseudomonas Putida ◽  
Nitrogen Removal ◽  
Heterotrophic Nitrification ◽  
Resistant Bacterium ◽  
Aerobic Denitrification

scholarly journals Nitrogen Removal Characteristics of Pseudomonas putida Y-9 Capable of Heterotrophic Nitrification and Aerobic Denitrification at Low Temperature

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Yi Xu ◽  
Tengxia He ◽  
Zhenlun Li ◽  
Qing Ye ◽  
Yanli Chen ◽  
...  
Keyword(s):  
Low Temperature ◽  
Pseudomonas Putida ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Heterotrophic Nitrification ◽  
Oxidation Products ◽  
Aerobic Denitrification ◽  
Nitrification Rate ◽  
High Concentration ◽  
Nitrate And Nitrite

The cold-adapted bacterium Pseudomonas putida Y-9 was investigated and exhibited excellent capability for nitrogen removal at 15°C. The strain capable of heterotrophic nitrification and aerobic denitrification could efficiently remove ammonium, nitrate, and nitrite at an average removal rate of 2.85 mg, 1.60 mg, and 1.83 mg NL−1 h−1, respectively. Strain Y-9 performed nitrification in preference to denitrification when ammonium and nitrate or ammonium and nitrite coexisted in the solution. Meantime, the presence of nitrate had no effect on the ammonium removal rate of strain Y-9, and yet the presence of high concentration of nitrite would inhibit the cell growth and decrease the nitrification rate. The experimental results indicate that P. putida Y-9 has potential application for the treatment of wastewater containing high concentrations of ammonium along with its oxidation products at low temperature.

scholarly journals Identification and Characterization of Janthinobacterium svalbardensis F19, a Novel Low-C/N-Tolerant Denitrifying Bacterium

2019 ◽  
Vol 9 (9) ◽  
pp. 1937 ◽  
Author(s):  
Yinyan Chen ◽  
Peng Jin ◽  
Zhiwen Cui ◽  
Tao Xu ◽  
Ruojin Zhao ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Removal Rate ◽  
Pcr Amplification ◽  
Domestic Wastewater ◽  
Heterotrophic Nitrification ◽  
Aerobic Denitrification ◽  
Nitrite Accumulation ◽  
Specific Pcr ◽  
Domestic Wastewater Treatment ◽  
Initial Ph

Herein, we isolated Janthinobacterium svalbardensis F19 from sludge sediment. Strain F19 can simultaneously execute heterotrophic nitrification and aerobic denitrification under aerobic conditions. The organism exhibited efficient nitrogen removal at a C/N ratio of 2:1, with an average removal rate of 0.88 mg/L/h, without nitrite accumulation. At a C/N ratio of 2, an initial pH of 10.0, a culturing temperature of 25 °C, and sodium acetate as the carbon source, the removal efficiencies of ammonium, nitrate, nitrite, and hydroxylamine were 96.44%, 92.32%, 97.46%, and 96.69%, respectively. The maximum removal rates for domestic wastewater treatment for ammonia and total nitrogen were 98.22% and 92.49%, respectively. Gene-specific PCR amplification further confirmed the presence of napA, hao, and nirS genes, which may contribute to the heterotrophic nitrification and aerobic denitrification capacity of strain F19. These results indicate that this bacterium has potential for efficient nitrogen removal at low C/N ratios from domestic wastewater.

Microbiological conversions in nitrogen removal

1998 ◽  
Vol 38 (1) ◽  
pp. 1-7 ◽  
Author(s):  
M. C. M. Van Loosdrecht ◽  
M. S. M. Jetten
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Organic Substrate ◽  
Heterotrophic Nitrification ◽  
Aerobic Denitrification ◽  
Ammonium Oxidation ◽  
Treatment Processes ◽  
Nitrogen Conversion ◽  
The Many ◽  
Wastewater Treatment Systems

Nitrogen conversion processes are essential for most wastewater treatment systems. Due to the many possible conversions, and the complexity of analysing the reactions under actual conditions, there is much room for confusion. This review provides an overview of the possible microbiological nitrogen conversions described in literature. The relevance of these conversions with respect to wastewater treatment processes is discussed. Rates described for aerobic denitrification or denitrification by autotrophic nitrifiers are so low that these conversions probably do not play a significant role under practical conditions. Heterotrophic nitrification may be of relevance only when the wastewater contains a high COD/N ratio (>10). Anaerobic ammonium oxidation can occur in fully autotrophic systems with very long sludge retention times or biofilm systems. This conversion offers great opportunities since it allows us to denitrify with ammonium as electron donor, i.e. no organic substrate is needed in the nitrogen removal process.

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