N<sub>2</sub>O EMISSION CHARACTERISTICS DURING BIOLOGICAL NITROGEN REMOVAL FROM WASTEWATER IN A SBR SYSTEM

LIU Guo-hua; PANG Yu-min; QI Lu; WANG Hong-chen

doi:10.13205/j.hjgc.202007008

Volume 38 Issue 7

Nov. 2020

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LIU Guo-hua, PANG Yu-min, QI Lu, WANG Hong-chen. N2O EMISSION CHARACTERISTICS DURING BIOLOGICAL NITROGEN REMOVAL FROM WASTEWATER IN A SBR SYSTEM[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(7): 51-57. doi: 10.13205/j.hjgc.202007008

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LIU Guo-hua, PANG Yu-min, QI Lu, WANG Hong-chen. N₂O EMISSION CHARACTERISTICS DURING BIOLOGICAL NITROGEN REMOVAL FROM WASTEWATER IN A SBR SYSTEM[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(7): 51-57. doi: 10.13205/j.hjgc.202007008

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N₂O EMISSION CHARACTERISTICS DURING BIOLOGICAL NITROGEN REMOVAL FROM WASTEWATER IN A SBR SYSTEM

doi: 10.13205/j.hjgc.202007008

Low-Carbon Water Environment Technology Centre, School of Environment & Natural Resource, Renmin University of China, Beijing 100872, China

Received Date: 2020-04-05

Abstract

Abstract

N₂O is a typical greenhouse gas, and contributes severely to global warming. The process for biological nitrogen removal from wastewater is considered as an important source of N₂O emission. The present study investigated the characteristics and main source of N₂O in a SBR system, with an anoxic-aerobic (A/O) running mode. The results showed that N₂O emission occurred mainly during the aerobic phase in the A/O SBR system. The maximum N₂O emission rate reached 2.02 μg/(min·g), and the cumulative N₂O emission during the aerobic phase was 8.2 mg, then the nitrite accumulation concentrate was observed to get the highest value of 7.5 mg/L after 120-minite operation. On the basis of bacterial community analysis, the bacteria in the dominant DGGE bands were identified as Flavobacteria, some of which was found to be aerobic denitrifying bacteria. It was inferred that the accumulation of nitrite might inhibit the activity of nitrous oxide reductase (Nos) from aerobic denitrifying bacteria and lead to N₂O emission. The accumulation of nitrite should be avoided or reduced in real biological wastewater treatment process.
- N₂O emission,
- NO₂^--N,
- aerobic denitrifying bacteria,
- SBR,
- biological nitrogen removal

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References(41)

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