Aquatic environment

N2O emission from nitrogen removal via nitrite in oxic-anoxic granular sludge sequencing batch reactor

Hong Liang , Jiaoling Yang , Dawen Gao


Received April 29, 2013,Revised July 03, 2013, Accepted , Available online March 04, 2014

Volume 26,2014,Pages 537-541

Bionitrification is considered to be a potential source of nitrous oxide (N2O) emissions, which are produced as a by-product during the nitrogen removal process. To investigate the production of N2O during the process of nitrogen removal via nitrite, a granular sludge was studied using a lab-scale sequence batch reactor operated with real-time control. The total production of N2O generated during the nitrification and denitrification processes were 1.724 mg/L and 0.125 mg/L, respectively, demonstrating that N2O is produced during both processes, with the nitrification phase generating larger amount. In addition, due to the N2O-N mass/oxidized ammonia mass ratio, it can be concluded that nitrite accumulation has a positive influence on N2O emissions. Results obtained from PCR-DGGE analysis demonstrate that a specific Nitrosomonas microorganism is related to N2O emission.

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