Heterotrophic nitrogen removal by <Emphasis Type="Italic">Providencia rettgeri</Emphasis> strain YL |
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Authors: | Bin Zhao Yi Liang He Jue Huang Shauna Taylor Joseph Hughes |
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Institution: | (1) School of Environmental Science and Engineering, Shanghai Jiao-Tong University, Shanghai, 200240, China;(2) School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA; |
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Abstract: | Providencia rettgeri strain YL was found to be efficient in heterotrophic nitrogen removal under aerobic conditions. Maximum removal of NH4
+–N occurred under the conditions of pH 7 and supplemented with glucose as the carbon source. Inorganic ions such as Mg2+, Mn2+, and Zn2+ largely influenced the growth and nitrogen removal efficiency. A quantitative detection of nitrogen gas by gas chromatography
was conducted to evaluate the nitrogen removal by strain YL. From the nitrogen balance during heterotrophic growth with 180 mg/l
of NH4
+–N, 44.5% of NH4
+–N was in the form of N2 and 49.7% was found in biomass, with only a trace amount of either nitrite or nitrate. The utilization of nitrite and nitrate
during the ammonium removal process demonstrated that the nitrogen removal pathway by strain YL was heterotrophic nitrification-aerobic
denitrification. A further enzyme assay of nitrate reductase and nitrite reductase activity under the aerobic condition confirmed
this nitrogen removal pathway. |
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Keywords: | |
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