title: Heterotrophic nitrification and aerobic denitrification by Pseudomonas tolaasii Y-11 without nitrite accumulation during nitrogen conversion.
abstract: A hypothermia aerobic nitrite-denitrifying bacterium, Pseudomonas tolaasii strain Y-11, was found to display high removal capabilities for heterotrophic nitrification with ammonium and for aerobic denitrification with nitrate or nitrite nitrogen. When strain Y-11 was cultivated for 4days at 15°C with the initial ammonium, nitrate and nitrite nitrogen concentrations of 209.62, 204.61 and 204.33mg/L (pH 7.2), the ammonium, nitrate and nitrite removal efficiencies were 93.6%, 93.5% and 81.9% without nitrite accumulation, and the corresponding removal rates reached as high as 2.04, 1.99 and 1.74mg/L/h, respectively. Additionally, ammonium was removed mainly during the simultaneous nitrification and denitrification process. All results demonstrate that P. tolaasii strain Y-11 has the particularity to remove ammonium, nitrate and nitrite nitrogen at low temperatures, which guarantees it for future application in winter wastewater treatment.
authors.affiliation: Chongqing Key Laboratory of Soil Multiscale Interfacial Process, College of Resources and Environments, Southwest University, Chongqing 400716, China.
authors.forename: Tengxia
authors.initials: T
authors.lastname: He
authors.affiliation: Chongqing Key Laboratory of Soil Multiscale Interfacial Process, College of Resources and Environments, Southwest University, Chongqing 400716, China. Electronic address: lizhlun4740@sina.com.
authors.forename: Zhenlun
authors.initials: Z
authors.lastname: Li
authors.affiliation: Guizou Dejiang Secondary Vocational School, Guizhou 565200, China.
authors.forename: Quan
authors.initials: Q
authors.lastname: Sun
authors.affiliation: Chongqing Key Laboratory of Soil Multiscale Interfacial Process, College of Resources and Environments, Southwest University, Chongqing 400716, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Chongqing Key Laboratory of Soil Multiscale Interfacial Process, College of Resources and Environments, Southwest University, Chongqing 400716, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Ye
mesh_terms: D000332:Aerobiosis; D064751:Ammonium Compounds / Q000737:chemistry; D001419:Bacteria; D058440:Denitrification; D052836:Heterotrophic Processes; D006863:Hydrogen-Ion Concentration; D058465:Nitrification; D009573:Nitrites / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D011549:Pseudomonas / Q000201:enzymology*; D013696:Temperature; D062065:Wastewater; D018508:Water Purification / Q000379:methods*
chemical_list: D064751:Ammonium Compounds; D009573:Nitrites; D009584:Nitrogen; D062065:Wastewater
keywords: Aerobic denitrification; Heterotrophic nitrification; Nitrogen conversion; Pseudomonas tolaasii