Applied Microbiology and Biotechnology

, Volume 55, Issue 1, pp 90–94

Nitrate reduction by Citrobacter diversus under aerobic environment

  • H. K. Huang
  • S. K. Tseng
SHORT CONTRIBUTION

DOI: 10.1007/s002530000363

Cite this article as:
Huang, H. & Tseng, S. Appl Microbiol Biotechnol (2001) 55: 90. doi:10.1007/s002530000363

Abstract

A new aerobic denitrifier, Citrobacter diversus, was isolated from both nitrification and denitrification sludge. To monitor the variation in the concentration of nitrogen oxides, aerobic denitrification by C. diversus was carried out in a batch reactor. When the nitrate concentration was greater than 180 mg N l−1, the nitrate reduction rate became stable. The effect of the C/N ratio on the denitrification activity was also investigated. The results showed that the optimum denitrification activity was obtained when the C/N ratio was 4–5. The range of the C/N ratio was higher than that for traditional anoxic denitrification. The effect of the dissolved oxygen concentration was further studied; and it was found that the range of dissolved oxygen concentrations, both for specific growth rates and for specific denitrification rates, was 2–6 mg−1. From these results, it can be concluded that both the concentration of dissolved oxygen and the C/N ratio are key factors in the aerobic denitrification by C. diversus.

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • H. K. Huang
    • 1
  • S. K. Tseng
    • 1
  1. 1.Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Road, Taipei 106, Taiwan e-mail: d3507004@ms.cc.ntu.edu.tw Tel.: +886-2-23632637 Fax: +886-2-23637854TW

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