Heterotrophic ammonium removal characteristics of an aerobic heterotrophicnitrifying-denitrifying bacterium, Providencia rettgeri YL
TAYLOR Shauna M , HE Yiliang , ZHAO Bin , HUANG Jue
DOI:
Received December 08, 2008,Revised February 25, 2009, Accepted , Available online
Volume 21,2009,Pages 1336-1341
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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.
