Effect of Carbon Nitrogen Ratio on Simultaneous Nitrification and Denitrification via Nitrite Technology in Sequencing Batch Biofilm Reactor and the Process Control

Abstract:

This study aimed to evaluate the effect of carbon nitrogen ratio (COD/N) on simultaneous nitrification and denitrification (SND) via nitrite technology in SBBR and the process control. Under the condition of different C/N ratios respectively 1.8, 3.6, 7,5,11.1 and 13.7, the various indices of the removal efficiency in the system and DO, ORP, and pH in the process of reaction were investigated. The C/N ratio was found to be an important limiting factor for SBBR simultaneous nitrification and denitrification via nitrite process. After integrating the factor of energy consumption and removal efficiency, we obtained that the optimum C/N ratios control range from 7.5 to 11.1, reaction time was between 225 min and 315 min, nitrite accumulation rate was between 72.83 % and 78.7 %, COD removal rate was between 92.31 % and 93.08 %, the total nitrogen removal rate was between 81.0 % and 85.86 %. For steady-state simultaneous nitrification and denitrification via nitrite process in SBBR, the jump point (C) on the DO, pH and ORP curve at reaction later period can be used as a control point to indicate the end of the reaction.

• Periodical: Advanced Materials Research (Volume 777)
• Pages: 232-237
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.777.232
• Online since: September 2013
• Authors: Hui Wei Zhao, Ke Fang Zhang, Hong Wei Rong, Chao Sheng Zhang, Zhi Wen Yang
• Keywords: Carbon Nitrogen Ratio (COD/N), Process Control, Sequencing Batch Biofilm Reactor (SBBR), Simultaneous Nitrification and Denitrification (SND) via Nitrite

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