Regulating Strategies of Strengthening Nitrogen Removal for Low-Carbon Wastewater in Reversed A²/O Process

Abstract:

According to the ineffective denitrification and the initial controlling technique flaws for low-carbon source in reversed A²/O process, and full scale experimental studies were conducted to strengthen denitrification at normal and low temperature days in 2008~2010, to ensure the best conditions of biological denitrification and promote the stable and efficient operation of the system. The results showed that in normal temperature seasons of 2008, after shortening the HRT of the primary sedimentation tank to 1/3 of design value, improving the MLSS to 4500mg/L, setting the first section of the aerobic zone as the denitrification transition section and improving the reflux ratio, available carbon source was increased by 15%, the effluent NH₃-N was 2.5mg / L and the removal rate was 90%, the effluent TN was 17 mg/L and the removal rate was increased to 54% and unit power consumption was reduced by 15% to 0.22Kw•h/m³.At low temperature seasons of 2008~2009,by improving the MLSS to 6000mg/L, extending the sludge age to enrich a large number of nitrification and denitrification bacteria, controlling DO at about 1.2mg / L in the aerobic zone and so on, the effluent NH₃-N was 3 mg / L and the removal rate was 88%, the effluent TN was 15.5 mg/L and the removal rate was 62%. In low temperature of 2009 ~2010, besides the same measures as before, adding a blender in the first section of the aerobic zone to provide a better anoxic environment for denitrification and to improve nitrogen removal, the effluent NH₃-N was 3 mg / L and the removal rate was 87%, the effluent TN was 13.5 mg/L and the removal rate was 66%.

• Periodical: Advanced Materials Research (Volumes 243-249)
• Pages: 4811-4816
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.243-249.4811
• Online since: May 2011
• Authors: Jie Yun Chen, Zhi Zhang, Li Hua Xie, Ling Kong, Xiao Jing Yin
• Keywords: Low-Carbon Source, Regulating Strategies, Reversed A²/O Process, Strengthening Nitrogen Removal, Temperature

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