title: Heterotrophic ammonium removal characteristics of an aerobic heterotrophic nitrifying-denitrifying bacterium, Providencia rettgeri YL.
abstract: Bacterium Providencia rettgeri YL was found to exhibit an unusual ability to heterotrophically nitrify and aerobically denitrify various concentrations of ammonium (NH4+-N). In order to further understand its removal ability, several experiments were conducted to identify the growth and ammonium removal response at different carbon to nitrogen (C/N) mass ratios, shaking speeds, temperatures, ammonium concentrations and to qualitatively verify the production of nitrogen gas using gas chromatography techniques. Results showed that under optimum conditions (C/N 10, 30 degrees C, 120 r/min), YL can significantly remove low and high concentrations of ammonium within 12 to 48 h of growth, respectively. The nitrification products hydroxylamine (NH2OH), nitrite (NO2(-)) and nitrate (NO3(-)) as well as the denitrification product, nitrogen gas (N2), were detected under completely aerobic conditions.
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. shauna.taylor@gmail.com
authors.forename: Shauna M
authors.initials: SM
authors.lastname: Taylor
authors.forename: Yiliang
authors.initials: Y
authors.lastname: He
authors.forename: Bin
authors.initials: B
authors.lastname: Zhao
authors.forename: Jue
authors.initials: J
authors.lastname: Huang
mesh_terms: D000332:Aerobiosis; D001673:Biodegradation, Environmental; D052836:Heterotrophic Processes / Q000502:physiology*; D008855:Microscopy, Electron, Scanning; D009573:Nitrites / Q000378:metabolism*; D011532:Providencia / Q000378:metabolism* / Q000648:ultrastructure; D000644:Quaternary Ammonium Compounds / Q000378:metabolism*; D013696:Temperature
chemical_list: D009573:Nitrites; D000644:Quaternary Ammonium Compounds