Simultaneous nitrification and denitrification in activated sludge system under low oxygen concentration |
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Authors: | Zhang Peng and Zhou Qi |
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Institution: | (1) College of Environmental and Material Engineering, Yantai University, Yantai, 264025, China;(2) State key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai, 200092, China |
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Abstract: | Simultaneous nitrification and denitrification (SND), which is more economical compared with the traditional method for nitrogen
removal, is studied in this paper. In order to find the suitable conditions of this process, a mixed flow activated sludge
system under low oxygen concentration is investigated, and some key control parameters are examined for nitrogen removal from
synthetic wastewater. The results show that SND is accessible when oxygen concentration is 0.3–0.8 mg/L. The nitrogen removal
rate can be obtained up to 66.7% with solids retention time (SRT) of 45 d, C/N value of 10, and F/M ratio of 0.1 g COD/(g
MLSS·d). Theoretical analysis indicates that SND is a physical phenomenon and governed by oxygen diffusion in flocs.
Translated from Environmental Pollution and Control, 2004, 26(1): 11–13 译自: 环境污染与防治] |
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Keywords: | low oxygen concentration simultaneous nitrification and denitrification (SND) aerobic nitrification microenvironment theory |
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