Heterotrophic ammonium removal characteristics of an aerobic heterotrophic
nitrifying-denitrifying bacterium, Providencia rettgeri YL |
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| Authors: | TAYLOR Shauna M HE Yiliang ZHAO Bin and HUANG Jue |
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| Institution: | School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
E-mail: shauna.taylor@gmail.com,School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.,School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. and School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. |
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| 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 di erent 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°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. |
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| Keywords: | Providencia rettgeri YL heterotrophic ammonium removal aerobic denitrification |
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