Park, KY Inamori, Y Mizuochi, M Ahn, KH 2024-01-21T13:36:50Z 2024-01-21T13:36:50Z 2021-09-05 2000-09 1389-1723 https://pubs.kist.re.kr/handle/201004/141143 Nitrous oxide (N2O) can be emitted as a by-product of the process of nitrogen removal from wastewater. Two methods of complete denitrification and media application were studied in lab-scale intermittent aeration reactors fed with domestic wastewater to refine methods of controlling the N2O emission rate. A study on cyclic patterns showed that the highest N2O emission rate was at the beginning of the aerobic phase rather than the anoxic: phase. This was probably because the nitrifying bacteria had accumulated nitrite nitrogen (NO2-) under low DO conditions. Methanol as an external carbon source was added during the anoxic phase to reduce nitrate nitrogen (NO3-) when denitrification was completed. The N2O emission rates in both the aerobic and anoxic phases were significantly influenced by residual NO3-, increasing monotonically as the concentration of NO3- in the reactor increased. Over 95% of average N2O emissions in both the aerobic and anoxic phases were prevented when methanol was added. The biofilm reactor showed similar patterns to those of the non-biofilm reactor in track behavior, but the former was more effective in the reduction of N2O emissions. English SOC BIOSCIENCE BIOENGINEERING JAPAN DENITRIFYING ACTIVATED-SLUDGE NITROSOMONAS-EUROPAEA ALCALIGENES-FAECALIS WATER TREATMENT TREATMENT-PLANT N2O PRODUCTION NITRIFICATION DENITRIFICATION GAS Emission and control of nitrous oxide from a biological wastewater treatment system with intermittent aeration Article 10.1263/jbb.90.247 1 JOURNAL OF BIOSCIENCE AND BIOENGINEERING, v.90, no.3, pp.247 - 252 JOURNAL OF BIOSCIENCE AND BIOENGINEERING 90 3 247 252 scie scopus 000165257000004 2-s2.0-0034281848 Biotechnology & Applied Microbiology Food Science & Technology Biotechnology & Applied Microbiology Food Science & Technology Article DENITRIFYING ACTIVATED-SLUDGE NITROSOMONAS-EUROPAEA ALCALIGENES-FAECALIS WATER TREATMENT TREATMENT-PLANT N2O PRODUCTION NITRIFICATION DENITRIFICATION GAS nitrous oxide intermittent aeration nutrient removal external carbon wastewater treatment