Study on Shortcut and Simultaneous Nitrification and Denitrification under Low Temperatures

Abstract:

This paper studies the impact of cooling and warming on shortcut and simultaneous nitrification and denitrification under low temperature. The results show that the effluent concentration of NH4+-N and TN gradually increased, the nitrite accumulation rate decreased when DO was 0.3~0.5 mg•L-1, sludge return ratio was 300%, PH was 7.5~8.5, temperature dropped from 15 °Cto 8°C. From 10°C to 8°C in cooling, the average nitrite accumulation rate was 58.17% in A (HRT=24h) reactor. During the system heating process, treatment effect of the system gradually changed for the better. From 12°C to 15°Cin heating process, the average nitrite accumulation rate was 74.39% in B (HRT=48h) reactor. The system treatment effect in B reactor was better by contrasting A and B reactors, therefore, we can increase HRT to reduce the adverse effects on the system due to the temperature decreases to enhance TN removal effect of system.

• Periodical: Advanced Materials Research (Volumes 610-613)
• Pages: 2047-2052
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.610-613.2047
• Online since: December 2012
• Authors: Jin Xiang Fu*, Xin Chun Zhang, Peng Fei Yu
• Keywords: HRT, Hypothermia, Shortcut Nitrification and Denitrification, Simultaneous Nitrification and Denitrification (SND)

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