Heterotrophic ammonium removal characteristics of an aerobic heterotrophic nitrifying-denitrifying bacterium, Providencia rettgeri

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• 作者：Shauna M TAYLOR ; Yiliang HE ; Bin ZHAO ; Jue HUANG
• 关键词：Providencia rettgeri YL ; heterotrophic ammonium removal ; aerobic denitrification
• 刊名：Journal of Environmental Sciences
• 出版年：2009
• 出版时间：2009
• 年：2009
• 卷：21
• 期：10
• 页码：1336-1341
• 全文大小：244 K

文摘

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°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.